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  • 1.
    Aronsson Rindby, Anna Cornelia
    et al.
    Chalmers University of Technology.
    Sahlin, Augusta
    Chalmers University of Technology.
    Troell, Eva
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF AB.
    Kristoffersen, Hans
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF AB.
    Compilation and validation of heat transfer coefficients of quenching oils2012Inngår i: Proceedings of the 6th International Quenching and Control of Distortion Conference Including the 4th International Distortion Engineering Conference, 2012Konferansepaper (Annet vitenskapelig)
  • 2.
    Belov, Ilia
    et al.
    Jönköping University, Sweden.
    Payandeh, Mustafa
    Jönköping University, Sweden.
    Jarfors, Anders E. W.
    Jönköping University, Sweden.
    Leisner, Peter
    RISE - Research Institutes of Sweden. Jönköping University, Sweden.
    Wessén, Magnus
    Jönköping University, Sweden.
    Effect of fillets on heat transfer in a rheocast aluminium heatsink2016Inngår i: 2016 17th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE), 2016, artikkel-id 7463320Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The effect of fillets formed between the base and plate fins of rheocast aluminium heatsinks on the thermal resistance of the heatsinks has been quantified by simulation. Simulation methodology, including sequential optimization has been developed in order to determine hotspot distributions where the fillets have the maximum effect. Combination of different fillet dimensions with various base thickness levels and aluminium alloys having inhomogeneous thermal conductivity have been investigated. For the studied cases, the effect of fillets on heatsink thermal resistance differs from negligible to 6%. The results would guide thermal designers on contribution of fillets to the heat transfer in multi-fin heatsinks for natural convection.

  • 3.
    Berglund, Johan
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF AB.
    Kjellberg, Mikael
    Liljengren, Magnus
    Kjellsson, Kenneth
    New Test Method for Detection and Analysis of Burrs and Slivers in Trimming and Punching Aluminium Sheet Metal2014Konferansepaper (Fagfellevurdert)
  • 4.
    Berglund, Johan
    et al.
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Troell, Eva
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Surface Topography of Nitrided Steel Surfaces2017Konferansepaper (Annet vitenskapelig)
  • 5.
    Edström, Adam
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Målberg, Sofia
    RISE - Research Institutes of Sweden, ICT, Acreo.
    The Strategic Research Agenda for the Swedish Additive Metal Manufacturing Industry2018Annet (Annet (populærvitenskap, debatt, mm))
  • 6.
    Holmberg, Jonas
    et al.
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Berglund, Johan
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Wretland, Anders
    GKN Aerospace Sweden AB, Sweden.
    Beno, Tomas
    University West, Sweden.
    Evaluation of surface integrity after high energy machining with EDM, laser beam machining and abrasive water jet machining of alloy 7182019Inngår i: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 100, nr 5-8, s. 1575-1591Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Development of future aero engine components based on new design strategies utilising topological optimisation and additive manufacturing has in the past years become a reality. This allows for designs that involve geometries of “free form” surfaces and material combinations that could be difficult to machine using conventional milling. Hence, alternative manufacturing routes using non-conventional high energy methods are interesting to explore. In this investigation, the three high energy machining methods abrasive water jet machining (AWJM), electrical discharge machining (EDM) and laser beam machining (LBM) have been compared in terms of surface integrity to the reference, a ball nosed end milled surface. The results showed great influence on the surface integrity from the different machining methods. It was concluded that AWJM resulted in the highest quality regarding surface integrity properties with compressive residual stresses in the surface region and a low surface roughness with texture from the abrasive erosion. Further, it was shown that EDM resulted in shallow tensile residual stresses in the surface and an isotropic surface texture with higher surface roughness. However, even though both methods could be considered as possible alternatives to conventional milling they require post processing. The reason is that the surfaces need to be cleaned from either abrasive medium from AWJM or recast layer from EDM. It was further concluded that LBM should not be considered as an alternative in this case due to the deep detrimental impact from the machining process. © 2018, The Author(s).

  • 7.
    Holmberg, Jonas
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF AB.
    Lundin, Per
    Stresstech OY, Finland.
    Olavisson, Jari
    Volvo Powertrain AB, Sweden.
    Sevim, Solmaz
    Bodycote, Sweden.
    Non destructive testing of surface characteristics after nitrocarburizing of three different steel grades2017Konferansepaper (Annet vitenskapelig)
  • 8.
    Holmberg, Jonas
    et al.
    RISE - Research Institutes of Sweden, Material och produktion, IVF, Tillverkningsprocesser. University West, Sweden.
    Steuwer, Axel
    Nelson Mandela Metropolitan University, South Africa.
    Stormvinter, Albin
    RISE - Research Institutes of Sweden, Material och produktion, IVF, Tillverkningsprocesser.
    Kristoffersen, Hans
    RISE - Research Institutes of Sweden, Material och produktion, IVF, Tillverkningsprocesser.
    Haakanen, Marja
    Stresstech OY, Finland.
    Berglund, Johan
    RISE - Research Institutes of Sweden, Material och produktion, IVF, Tillverkningsprocesser.
    Residual stress state in an induction hardened steel bar determined by synchrotron- and neutron diffraction compared to results from lab-XRD2016Inngår i: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 667, s. 199-207Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Induction hardening is a relatively rapid heat treatment method to increase mechanical properties of steel components. However, results from FE-simulation of the induction hardening process show that a tensile stress peak will build up in the transition zone in order to balance the high compressive stresses close to the surface. This tensile stress peak is located in the transition zone between the hardened zone and the core material. The main objective with this investigation has been to non-destructively validate the residual stress state throughout an induction hardened component. Thereby, allowing to experimentally confirming the existence and magnitude of the tensile stress peak arising from rapid heat treatment. For this purpose a cylindrical steel bar of grade C45 was induction hardened and characterised regarding the microstructure, hardness, hardening depth and residual stresses. This investigation shows that a combined measurement with synchrotron/neutron diffraction is well suited to non-destructively measure the strains through the steel bar of a diameter of 20 mm and thereby making it possible to calculate the residual stress profile. The result verified the high compressive stresses at the surface which rapidly changes to tensile stresses in the transition zone resulting in a large tensile stress peak. Measured stresses by conventional lab-XRD showed however that at depths below 1.5 mm the stresses were lower compared to the synchrotron and neutron data. This is believed to be an effect of stress relaxation from the layer removal. The FE-simulation predicts the depth of the tensile stress peak well but exaggerates the magnitude compared to the measured results by synchrotron/neutron measurements. This is an important knowledge when designing the component and the heat treatment process since this tensile stress peak will have great impact on the mechanical properties of the final component.

  • 9.
    Holmberg, Jonas
    et al.
    RISE - Research Institutes of Sweden, Material och produktion, IVF. University Wes, Sweden.
    Wretland, Anders
    GKN Aerospace Sweden AB, Sweden.
    Berglund, Johan
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Grit Blasting for Removal of Recast Layer from EDM Process on Inconel 718 Shaft: An Evaluation of Surface Integrity2016Inngår i: Journal of materials engineering and performance (Print), ISSN 1059-9495, E-ISSN 1544-1024, Vol. 25, nr 12, s. 5540-5550Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The heat generated during EDM melts the work material and thereby allows large amounts to be removed, but an unfavorable surface of a recast layer (RCL) will also be created. This layer has entirely different properties compared to the bulk. Hence, it is of great interest to efficiently remove this layer and to verify that it has been removed. The main objective of this work has been to study the efficiency of grit blasting for removal of RCL on an EDM aero space shaft. Additionally, x-ray fluorescence (XRF) has been evaluated as a nondestructive measurement to determine RCL presence. The results show that the grit-blasting processing parameters have strong influence on the ability to remove RCL and at the same time introduce beneficial compressive stresses even after short exposure time. Longer exposure will remove the RCL from the surface but also increase the risk that a larger amount of the blasting medium will get stuck into the surface. This investigation shows that a short exposure time in combination with a short grit-blasting nozzle distance is the most preferable process setting. It was further found that handheld XRF equipment can be used as a nondestructive measurement in order to evaluate the amount of RCL present on an EDM surface. This was realized by analyzing the residual elements from the EDM wire.

  • 10.
    Lauenstein, Åsa
    RISE - Research Institutes of Sweden, Swerea, Swerea SWECAST AB.
    ACDC Test och Demo för hållbara gjutna komponenter2017Rapport (Annet vitenskapelig)
    Abstract [sv]

    Projektet ACDC syftar till att vidareutveckla Swerea SWECASTs Test- ochdemonstrationsanläggning för utveckling av gjutprocesser och gjutna prototyperoch produkter i riktning mot det övergripande målet att strukturen ska utformas såatt en långsiktig och hållbar drift av anläggningen kan genomföras.T&D-anläggningen är en viktig resurs för forsknings- och uppdragsverksamhetenpå SWECAST. Grunden utgörs av en pågående verksamhet i försöksgjuteriet somtidigare fokuserat på utbildning av gjuterioperatörer och praktiska provgjutningar,men som under en följd av år successivt har breddats till att även inkludera såväldesign- och beredningsprocess som efterkontroll av material och komponenter.Verksamheten inkluderar även en 3D-printer för sandformar och kärnor. På siktär strävan att även inkludera utvärdering av den färdiga komponentens prestandagenom exempelvis utmattningsprovning, korrosionstester och fälttester.Denna delrapport beskriver det arbete som bedrivits under första halvan avprojektet ACDC för att omvandla det tidigare utbildningsjuteriet till en effektivoch funktionell försöksanläggning, hitta nya samverkansformer internt på Swecastsamt ta fram en bärkraftig metodik för framställning av gjutna koncept inomprojekt och uppdrag.Inom projektet ACDC återstår flera viktiga punkter att slutföra under 2017. Enkonkret vision om långsiktig hållbarhet för T&D-anläggningen ska formuleras.Examensarbetet om virtuella modeller ska slutföras och utvärderas. Slutligen ärambitionen att dessutom utforma en modell för Framtidens Gjuteri.

  • 11.
    Lyckfeldt, Ola
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF AB.
    Metal Powder Characterization for 3D Printing2015Inngår i: Proceedings of the 4M International Conference on Multi-Material, 4M/COMM2015, 2015, s. 460-493Konferansepaper (Annet vitenskapelig)
  • 12.
    Mölmen, Live
    et al.
    RISE - Research Institutes of Sweden, Säkerhet och transport, Elektronik. Jönköping University, Sweden.
    Braun, Maximilian
    FEM Forschungsinstitut Edelmetalle Metallchemie, Germany.
    Baumgärtner, Manfred
    FEM Forschungsinstitut Edelmetalle Metallchemie, Germany.
    Leisner, Peter
    RISE - Research Institutes of Sweden, Säkerhet och transport, Elektronik. Jönköping University, Sweden.
    Pt-P catalyst for fuel cells2019Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Fuel cell technology is becoming increasingly important in a society where the energy system is changing toward a high degree of electrification based on fossil-free primary sources of energy. Among commercial fuel cells, PEM (polymer electrolyte membrane) technology is dominating and the production is doubled each year. The reason for PEM technology being so prosperous is the ability of the industry to manufacture thin film materials (electrodes, membranes and protective films on bipolar plates), while also reaching high current densities. In order to improve the efficiency, catalysts are applied in the electrodes. These improvements have been achieved during the last decades thanks to significant materials development of membranes and electrodes, including micro- and nano-structuring and catalyst development by materials-doping. Thus, PEM technology has a strong potential to offer sustainable, cost effective and flexible solutions.

    However, PEM technology is sensitive to contamination of catalysts and membrane. Additionally, the demanding internal environment (chemistry, temperature, pressure, and dynamic operation make the conditions very harsh) poses complex challenges in terms of durability. Therefore, there are still challenges to overcome to make PEM technology more efficient and robust and thereby beneficial. The most important areas of materials development to reduce the cost of PEM fuel cells are

    • High-performance electrode catalysts enabling ultra-low precious metal loading,
    • Lower cost, lighter, corrosion-resistant bipolar plates,
    • Low cost, high-performance membranes.

    The purpose of the present work is synthesis of catalytic Pt and PtP nanoparticles onto the gas diffusion layer (GDL) of PEM fuel cells by electrodeposition, and in a next step to study aging during fuel cell testing.

    Pt particles with varying P concentration are electrodeposited onto the carbon paper GDL. The concentrations used were 0 at% P, 1 at% P and 10 at% P. The GDL is activated by plasma etching prior to electroplating. The electrolyte used, contained 8 gL-1 Pt as Pt(NO2)2(NH3)2, 70 gL-1  NaCH3COOH and 100 gL-1  Na2CO3. Phosphorous was added in the form of H3PO3. Pulsed electrodeposition was performed at a temperature of 30 °C with an on-time of 0.005 seconds and off-time of 0.195 s. The peak current was 5 A.

  • 13.
    Odenberger, Eva-Lis
    et al.
    RISE - Research Institutes of Sweden, Material och produktion, IVF. Luleå University of Technology, Sweden.
    Perez Caro, Lluis
    RISE - Research Institutes of Sweden, Material och produktion, IVF. Luleå University of Technology, Sweden.
    Ņhlin, Hans
    Luleå University of Technology, Sweden.
    Oldenburg, Mats
    Luleå University of Technology, Sweden.
    Thermo-mechanical Material Characterization and Stretch-bend Forming of AA60162018Inngår i: IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X, Vol. 418, nr 1Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Lightweight design has become increasingly in focus for the manufacturing industry. Global environmental challenges, goals and legislations imply that lighter and sustainable products are imperative to remain competitive. One example is stamped products made of aluminum alloys which are of interest to the automotive industry, where lightweight designs are essential. In order to increase formability and to produce more complex geometries in stamped aluminum components there is a need to develop hot forming techniques. The Finite Element Method (FEM) has enabled important advances in the study and design of competitive manufacturing procedures for metal parts. Predicting the final geometry of a component is a complex task, especially if the forming procedure occurs at elevated temperatures. This work presents selected results from thermo-mechanical material testing procedures, FE-analyses and forming validation tests in AA6016 material. The material tests are used to determine the thermo-mechanical anisotropic properties, strain rate sensitivity and formability (Forming Limit Curves, FLC) at temperatures up to 490°C. Stretch-bending tests are performed to compare predicted results with experimental observations such as punch force, strain levels, thinning, forming temperatures, springback and failure. It was found that the heat-treatment and forming at elevated temperatures substantially increased formability and that measured responses could in general be predicted if care was taken to model the initial blank temperatures, heat transfer and thermo-mechanical material properties. The room temperature case confirms the importance of considering anisotropy. © Published under licence by IOP Publishing Ltd.

  • 14.
    Sibeck, Lennart
    RISE - Research Institutes of Sweden, Swerea, Swerea SWECAST AB.
    Högpresterande gjutna aluminiumkomponenter2017Rapport (Annet vitenskapelig)
    Abstract [sv]

    Projektet är en fortsättning och avrapportering av 3 års G-projekt inom högpresterande Al-legeringar, HPAL.

    Arbetet har fokuserat på att få ökad kunskap framförallt inom två områden; hur man kan öka hållfasthet respektive seghet hos kommersiella Al-Si-legeringar vid förhöjda temperaturer resp. rumstemperatur. En litteraturstudie har visat hur man genom tillsats av olika legeringstillsatser och användning av mer specialanpassade legeringar kan uppnå mycket goda egenskaper. I detta projekt har utgångspunkten varit konventionella legeringar. Bättre egenskaper skulle åstadkommas både genom optimering av legeringselement hos dessa och genom att minimera defektnivåer med förbättrad ingjutsteknik.

    Inför arbetet togs en ny provstavsmodell fram i CAD. För att visa flödets inverkan på defekter, och därmed hållfasthet, gjordes modellen i två versioner; bra resp. mindre bra ingjutssystem. Sandformarna togs fram med hjälp av 3D-skrivare. Resultaten av dragprovningen blev oväntade; skillnaden mellan grupperna var mycket liten.

    I arbetet med legeringar med förbättrad duktilitet valdes en legering från litteraturen, där man använt Cr för att till viss del ersätta Mg. Som utgångsmaterial valdes AlSi7Mg. Prover togs fram med hjälp av en gradientugn, där en kontrollerad stelning bidrar till att minimera defekter. Resultatet visar att Cr-tillsatsen gav en ganska liten ökning av segheten, däremot fick man efter konventionell åldring en ordentlig sänkning av brott- och sträckgräns. Åldring vid längre tider gav hållfasthet jämförbara med grundlegeringen utan Cr, men lägre än legeringen från litteraturen.

    Gradientstelningsförsök har visat att kisel bidrar starkt till varmhållfastheten vid 230 C för legeringen STENAL 460. En ökning av kiselhalten från 9,1 till 12,4 % ger bättre mekaniska egenskaper(R

    m, Rp0.2 och A5) vid såväl rumstemperatur som vid 230 C. Jämfört med baslegeringen erhölls förbättring av sträck- och brottgräns vid 230 C med 49 respektive 17 % samtidigt som brottförlängningen ökade med 20 %. Motsvarande förbättring av sträck- och brottgräns samt brottförlängning vid rumstemperatur var 16, 22 respektive 69 %. Ett examensarbete utfört vid JU visar intressanta resultat hur kisel, cobolt och nickel var för sig och tillsammans bidrar till varmhållfastheten för Al-Si-legeringar.

  • 15.
    Stormvinter, Albin
    et al.
    RISE - Research Institutes of Sweden, Material och produktion, IVF, Tillverkningsprocesser.
    Borgenstam, Annika
    KTH Royal Institute of Technology, Sweden.
    Miyamoto, Goro
    Tohoku University, Japan.
    Furuhara, Tadashi
    Tohoku University, Japan.
    Kristoffersen, Hans
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Quantitative metallography for industrial use on martensitic steels2015Inngår i: Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, 2015, s. 539-546Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The performance of powertrain components and rock tools relies on the inherent strength and hardness of ferrous martensite. Currently the industry uses experimental measurements of surface hardness and case depth to qualify their hardening processes. Often there are additional requirements on microstructure constituents, although there are no quantitative methods available to characterize ferrous martensite. Here such methodology is discussed in relation to EBSD measurements on the full practical range of Fe-C alloys. The orientation relationships between austenite and martensite along with the variant pairing tendency of martensite are determined from the EBSD data. These results are related to the well-known morphological transition from lath to plate martensite in Fe-C alloys. Quantitative metallography using EBSD has the potential to complement hardness- and residual-stress measurements when qualifying new steel grades and hardening processes in industry. It may also prove important when investigating the coupling between material properties and fatigue performance.

  • 16.
    Stormvinter, Albin
    et al.
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Goldsteinas, A.
    Rink, M.
    DoE – Interrupted Gas Quenching in a Single Chamber Vacuum Furnace2017Inngår i: Proceedings of the 24th IFHTSE CONGRESS 2017 European Conference on Heat Treatment and Surface Engineering, 2017Konferansepaper (Annet vitenskapelig)
  • 17.
    Stormvinter, Albin
    et al.
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Kristoffersen, Hans
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Olofsson, Anders
    Scania CV AB.
    Biwersi, Karin
    Scania CV AB.
    Haglund, Sven
    RISE - Research Institutes of Sweden, Material och produktion, KIMAB.
    Effect of Hardenability and Press Quenching on Distortion of Crown Wheels2014Konferansepaper (Annet vitenskapelig)
  • 18.
    Stormvinter, Albin
    et al.
    RISE - Research Institutes of Sweden, Material och produktion, IVF, Tillverkningsprocesser.
    Kristoffersen, Hans
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Troell, Eva
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Senaneuch, Jérôme
    RISE., Swerea, KIMAB.
    Haglund, Sven
    RISE., Swerea, KIMAB.
    Impact of internal oxidation and quenching path on fatigue of powertrain components2015Inngår i: Heat Treating 2015: Proceedings of the 28th ASM Heat Treating Society Conference, 2015, s. 498-503Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Atmospheric case hardening of powertrain components may cause internal oxidation and thus reduce hardenability at the surface zone. This may affect the fatigue strength, which restricts the maximum cyclic load on steel components and hence is a major impediment for powertrain development and design. Here we have investigated the effect of furnace gas atmosphere composition and quenching path on fatigue properties of powertrain components. The results show that the detrimental effect of internal oxidation on fatigue may be compensated for by altering of the furnace atmosphere. Moreover, it is shown that the quenching path below the martensite start temperature also has an impact on the fatigue properties. These experiments were done in a full-scale industrial furnace on steel bars in l6MnCr5 and 2ONiMo9-7F. 

  • 19.
    Stormvinter, Albin
    et al.
    RISE - Research Institutes of Sweden, Material och produktion, IVF, Tillverkningsprocesser.
    Olofsson, Anders
    Scania CV AB, Sweden.
    Kristoffersen, Hans
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Troell, Eva
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Effects of Hardenability and Quenching on Distortion of Steel Components2015Inngår i: Proceedings of the 5th International Conference on Distortion Engineering (IDE 2015), 2015, s. 39-46Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Distortion is a major concern for industrial production of case-hardened steel-components. Carriers of distortion have been identified at all stages in the production chain. Often recognized is the effect of steel hardenability, which is defined as “susceptibility to hardening by rapid cooling”. Hardenability is often represented by Jominy- or Grossman numbers, which are determined by experimental testing or calculation. Hardenability is derived from the steel ability to delay diffusion-controlled phase transformations, i.e. being dependent on alloying content and austenite grain-size. Hence, it may be of interest to investigate effects of individual alloying elements on distortion. Here we make an attempt to investigate the effect of hardenability (and alloying content) of case-hardening steel-grade 16NiCrS4 on distortion of ring- and c-shaped steel-components. The steel components are machined from tubes of three 16NiCrS4 heats, being dissimilar in alloying content and hardenability. After stress relief annealing, the steel-components were measured using either 3D-scanner or coordinate measuring machine. Subsequently, they were hardened, without carburization, using oil, gas or salt as quenchant. The components were measured in their hardened state and their distortion determined. The results clearly show the effects of hardenability and quenching on distortion. Moreover, these results are discussed in relation to production follow-up in industrial heat-treatment workshops. It is realized that to effectively handle distortion originating from hardenability; material, processing and component design has to be associated.

  • 20.
    Stormvinter, Albin
    et al.
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Senaneuch, Jérome
    RISE - Research Institutes of Sweden, Material och produktion, KIMAB.
    Makander, G.
    Kristoffersen, Hans
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Induction hardening: Effect of Bainite in the Case Layer on Fatigue Strength2017Inngår i: Proceedings of the 24th IFHTSE CONGRESS 2017 European Conference on Heat Treatment and Surface Engineering, 2017Konferansepaper (Annet vitenskapelig)
  • 21.
    Wiklund, Daniel
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF AB, Tillverkningsprocesser.
    Larsson, Mats
    University College West, Sweden.
    Phenomenological friction model in deep drawing of aluminum sheet metals2018Inngår i: IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X, Vol. 418, nr 1Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Friction is an important parameter in sheet metal forming since it influences the flow of material in the process. Consequently, it is also an important parameter in the design process of new stamping dies when numerical simulations are utilized. Today, the most commonly used friction model in forming simulations is Coulomb’s friction which is a strong simplification of the tribological system conditions and a contributory cause of discrepancy between simulation and physical experiments. There are micromechanical models available but with an inherent complexity that results in limited transparency for users. The objective in this study was to design a phenomenological friction model with a natural level of complexity when Coulomb’s friction is inadequate. The local friction model considers implicit properties of tool and sheet surface topography, lubricant viscosity, sheet metal hardness and strain, and process parameters such as sliding speed and contact pressure. The model was calibrated in a Bending-Under-Tension test (BUT) and the performance was evaluated in a cross shaped geometry (X-die). The results show a significant improvement of the simulation precision and provide the user a transparent tribological system. © Published under licence by IOP Publishing Ltd.

  • 22.
    Wänerholm, Martin
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea SWECAST AB.
    Heintz, Ida
    Minskat metallspill: Effektivare resursutnyttjande hos gjuterier och plåtindustri2016Rapport (Annet vitenskapelig)
    Abstract [sv]

    Tanken med projektet Spill till guld har varit att utveckla en internettjänst där det finns möjlighet att försöka sälja sitt material till intresserade användare alternativt knyta kontakter som kan användas för att hitta nya idéer hur man tar hand om sina restprodukter och kanske förädlar dessa.

    I arbetspaket metall har olika metoder för att få avsättning för slagg och metallinnehållande stoft från gjuterier studerats. Dessutom har möjligheten att minska mängden plåtspill vid tillskärning utretts.

    Först studerades möjligheter att återta metallstoftet till den egna processen och vad det skulle innebära ekonomiskt och hur hanteringen skulle ske. De stoft som analyserades innehöll dock en del annat än bara metall, till exempel sandrester och det visade sig därför vara svårt att få ekonomi i att föra tillbaka till den egna smältugnen. Andra projekt som genomförts visar att stoft med högre metallhalt eller som innehåller lite mer värdefulla metaller kan vara mer lönsamt. Det är alltså viktigt att skaffa kunskap om de stoft man har. Om stoftet ska återföras måste man hantera stoftet på ett bra sätt så att det inte flyger i väg när det läggs i smältan. Ett bra sätt att få god hantering är genom brikettering.

    Nästa steg var att undersöka om gjuteriernas restprodukter kunde användas i en annan bransch. Det mest naturliga var då att titta på om järn- och stålindustrin kunde ha ett intresse. Även här kan konstateras att stoft innehållande sandrester inte är helt optimalt och att det är svårt att få ekonomi i detta. Att separera olika material ur ett stoft kan vara ett viktigt steg för att få bättre ekonomi i återvinningen.

    När det gäller slagg från gjuterier i allmänhet kan dessa ibland innehålla relativt höga halter av rent järn och kan då säljas som skrot direkt. Ett antal olika användningsområden för olika typer av slagg har studerats både inom järn- och stålindustrin men även på annat håll. Även här har det varit svårt att få ekonomi i återvinningen av slagg. Inom projektet har kontakt även tagits med värmeverk för att se om slagg från gjuterier skulle kunna förbättra förbränningen i deras sandbäddar. Detta ser lovande ut och vidare diskussioner förs.

    Gällande minskat spill i plåtbranschen har en fallstudie genomförts samt omvärldsbevakning vid två mässor. Fallstudien visade på potential att minska plåtspill vid tillskärning av plåtkomponenter med laserskärmaskin från formatplåt genom användning av nya smartare nestingprogram. Hur stora vinster som kan göras beror på flera faktorer som med vilken tidhorisont som produktionen planeras, geometrin på komponenterna samt hur modern utrustning som används.

  • 23. Zanella, Caterina
    et al.
    Leisner, Peter
    RISE - Research Institutes of Sweden, Säkerhet och transport, Elektronik.
    mCBEEs Nytt europeisktutbildningsnätverk loser korrosionsproblem på mikro- och nanonivå2018Inngår i: YtforumArtikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 24.
    Zhu, Baiwei
    et al.
    Jönköping University, Sweden.
    Leisner, Peter
    RISE - Research Institutes of Sweden.
    Seifeddine, Salem
    Jönköping University, Sweden.
    Jarfors, Anders E. W.
    Jönköping University, Sweden.
    Influence of Si and cooling rate on microstructure and mechanical properties of Al-Si-Mg cast alloys2015Konferansepaper (Fagfellevurdert)
  • 25.
    Zhu, Baiwei
    et al.
    Jönköping University,Sweden.
    Seifeddine, Salem
    Jönköping University, Sweden.
    Jarfors, Anders E.W.
    Jönköping University, Sweden.
    Leisner, Peter
    RISE - Research Institutes of Sweden, Säkerhet och transport, Elektronik.
    Zanella, Caterina
    Jönköping University, Sweden.
    A study of anodising behaviour of Al-Si componentsproduced by rheocasting2018Konferansepaper (Annet vitenskapelig)
1 - 25 of 25
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