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  • 1.
    Andersson, Anton
    et al.
    Luleå University of Technology, Sweden.
    Gullberg, Amanda
    RISE - Research Institutes of Sweden, Swerea, Swerea MEFOS AB.
    Kullerstedt, Adeline
    RISE - Research Institutes of Sweden, Swerea, Swerea MEFOS AB.
    Sandberg, Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea MEFOS AB.
    Andersson, Mats
    SSAB Europe, Sweden.
    Ahmed, Hasham
    Luleå University of Technology, Sweden ; Central Metallurgical Research and Development Institute, Egypt.
    Sundqvist-ökvist, Lena
    RISE - Research Institutes of Sweden, Swerea, Swerea MEFOS AB. Luleå University of Technology, Sweden.
    Björkman, Bo
    Luleå University of Technology, Sweden.
    A holistic and experimentally-based view on recycling of off-gas dust within the integrated steel plant2018Inngår i: Metals, ISSN 2075-4701, Vol. 8, nr 10, artikkel-id 760Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Ore-based ironmaking generates a variety of residues, including slags and fines such as dust and sludges. Recycling of these residues within the integrated steel plant or in other applications is essential from a raw-material efficiency perspective. The main recycling route of off-gas dust is to the blast furnace (BF) via sinter, cold-bonded briquettes and tuyere injection. However, solely relying on the BF for recycling implicates that certain residues cannot be recycled in order to avoid build-up of unwanted elements, such as zinc. By introducing a holistic view on recycling where recycling via other process routes, such as the desulfurization (deS) station and the basic oxygen furnace (BOF), landfilling can be avoided. In the present study, process integration analyses were utilized to determine the most efficient recycling routes for off-gas dust that are currently not recycled within the integrated steel plants of Sweden. The feasibility of recycling was studied in experiments conducted in laboratory, pilot, and full-scale trials in the BF, deS station, and BOF. The process integration analyses suggested that recycling to the BF should be maximized before considering the deS station and BOF. The experiments indicated that the amount of residue that are not recycled could be minimized.

  • 2.
    Ceschini, Lorella
    et al.
    University of Bologna, Italy.
    Morri, Allesandro
    University of Bologna, Italy.
    Toschi, Stephania
    University of Bologna, Italy.
    Bjurenstedt, Anton
    RISE - Research Institutes of Sweden, Material och produktion, SWECAST.
    Seifeddine, Salem
    Jönköping University, Sweden.
    Influence of sludge particles on the fatigue behavior of Al-Si-Cu secondary aluminium casting alloys2018Inngår i: Metals, ISSN 2075-4701, Vol. 8, nr 4, artikkel-id 268Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Al-Si-Cu alloys are the most widely used materials for high-pressure die casting processes. In such alloys, Fe content is generally high to avoid die soldering issues, but it is considered an impurity since it generates acicular intermetallics (β-Fe) which are detrimental to the mechanical behavior of the alloys. Mn and Cr may act as modifiers, leading to the formation of other Fe-bearing particles which are characterized by less harmful morphologies, and which tend to settle on the bottom of furnaces and crucibles (usually referred to as sludge). This work is aimed at evaluating the influence of sludge intermetallics on the fatigue behavior of A380 Al-Si-Cu alloy. Four alloys were produced by adding different Fe, Mn and Cr contents to A380 alloy; samples were remelted by directional solidification equipment to obtain a fixed secondary dendrite arm spacing (SDAS) value (~10 µm), then subjected to hot isostatic pressing (HIP). Rotating bending fatigue tests showed that, at room temperature, sludge particles play a detrimental role on fatigue behavior of T6 alloys, diminishing fatigue strength. At elevated temperatures (200◦C) and after overaging, the influence of sludge is less relevant, probably due to a softening of the α-Al matrix and a reduction of stress concentration related to Fe-bearing intermetallics. 

  • 3.
    Fourlakidis, Vasilios
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, SWECAST.
    Belov, Ilja
    Jönköping University, Sweden.
    Diószegi, Attila
    Jönköping University, Sweden.
    Strength prediction for pearlitic lamellar graphite iron: Model validation2018Inngår i: Metals, ISSN 2075-4701, Vol. 8, nr 9, artikkel-id 684Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The present work provides validation of the ultimate tensile strength computational models, based on full-scale lamellar graphite iron casting process simulation, against previously obtained experimental data. Microstructure models have been combined with modified Griffith and Hall–Petch equations, and incorporated into casting simulation software, to enable the strength prediction for four pearlitic lamellar cast iron alloys with various carbon contents. The results show that the developed models can be successfully applied within the strength prediction methodology along with the simulation tools, for a wide range of carbon contents and for different solidification rates typical for both thin-and thick-walled complex-shaped iron castings.

  • 4.
    Karlsson Hagnell, Mathilda
    et al.
    KTH Royal Institute of Technology, Sweden.
    Khurshid, Mansoor
    Cargotec Sweden AB, Sweden; KTH Royal Institute of Technology, Sweden.
    Åkermo, Malin
    KTH Royal Institute of Technology, Sweden.
    Barsoum, Zuheir
    KTH Royal Institute of Technology, Sweden.
    Design implications and opportunities of considering fatigue strength, manufacturing variations and predictive lcc in welds2021Inngår i: Metals, ISSN 2075-4701, Vol. 11, nr 10, artikkel-id 1527Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Fatigue strength dictates life and cost of welded structures and is often a direct result of initial manufacturing variations and defects. This paper addresses this coupling through proposing and applying the methodology of predictive life-cycle costing (PLCC) to evaluate a welded structure exhibiting manufacturing-induced variations in penetration depth. It is found that if a full-width crack is a fact, a 50% thicker design can result in life-cycle cost reductions of 60% due to reduced repair costs. The paper demonstrates the importance of incorporating manufacturing variations in an early design stage to ensure an overall minimized life-cycle cost. © 2021 by the authors. 

  • 5.
    Kohne, Thomas
    et al.
    KTH Royal Institute of Technology, Sweden.
    Fahlkrans, Jonas
    Scania CV, Sweden.
    Haglund, Sven
    Swerim AB, Sweden.
    Stormvinter, Albin
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Troell, Eva
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Hedström, Peter
    KTH Royal Institute of Technology, Sweden.
    Borgenstam, Annika
    KTH Royal Institute of Technology, Sweden.
    Impact of Cooling Rate during High-Pressure Gas Quenching on Fatigue Performance of Low Pressure Carburized Gears2022Inngår i: Metals, ISSN 2075-4701, Vol. 12, nr 11, artikkel-id 1917Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The impact of cooling rate during high-pressure gas quenching on the fatigue performance of low-pressure carburized spur gears was studied for steel grades 20MnCr5 and 17NiCrMo6-4. The results show an increased fatigue limit by 10 to 11% when applying a slower cooling rate for both steel grades. Moreover, for 20MnCr5 the slower cooled gears show an increase in compressive residual stresses by 130 MPa compared to the faster cooling, although no significant difference was observed for 17NiCrMo6-4. It is also seen that the cooling rate affects the core hardness for both steel grades, while other properties like surface hardness, case-hardness depth and martensite variant pairing were unaffected. The results for the retained austenite content and average martensite unit size show no clear effect of the cooling rate. The possible influence of different carbon distributions after quenching for the two used cooling rates on the carbide precipitation and fatigue limit is discussed. © 2022 by the authors.

  • 6.
    Pant, Prabhat
    et al.
    Linköping University, Sweden.
    Sjöström, Sören
    Linköping University, Sweden.
    Simonsson, Kjell
    Linköping University, Sweden.
    Moverare, Johan
    Linköping University, Sweden.
    Proper, Sebastian
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Hosseini, Seyed
    RISE Research Institutes of Sweden, Material och produktion.
    Luzin, Vladimir
    ANSTO, Australia; University of Newcastle, Australia.
    Peng, Rulin
    Linköping University, Sweden.
    A simplified layer-by-layer model for prediction of residual stress distribution in additively manufactured parts2021Inngår i: Metals, ISSN 2075-4701, Vol. 11, nr 6, artikkel-id 861Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    With the improvement in technology, additive manufacturing using metal powder has been a go-to method to produce complex-shaped components. With complex shapes being printed, the residual stresses (RS) developed during the printing process are much more difficult to control and manage, which is one of the issues seen in the field of AM. A simplified finite element-based, layer-by-layer activation approach for the prediction of residual stress is presented and applied to L-shaped samples built in two different orientations. The model was validated with residual stress distributions measured using neutron diffraction. It has been demonstrated that this simplified model can predict the trend of the residual stress distribution well inside the parts and give insight into residual stress evolution during printing with time for any area of interest. Although the stress levels predicted are higher than the measured ones, the impact of build direction on the development of RS during the building process and the final RS distributions after removing the base plate could be exploited using the model. This is important for finalizing the print orientation for a complex geometry, as the stress distribution will be different for different print orientations. This simplified tool which does not need high computational power and time can also be useful in component design to reduce the residual stresses. © 2021 by the authors.

  • 7.
    Rybkina, Alevtina
    et al.
    Russian Academy of Sciences, Russia.
    Gladkikh, Natalia
    Russian Academy of Sciences, Russia.
    Marshakov, Andrey
    Russian Academy of Sciences, Russia.
    Petrunin, Maxim
    Russian Academy of Sciences, Russia.
    Nazarov, Andrei
    RISE Research Institutes of Sweden, Material och produktion, Korrosion.
    Effect of sign‐alternating cyclic polarisation and hydrogen uptake on the localised corrosion of X70 pipeline steel in near‐neutral solutions2020Inngår i: Metals, ISSN 2075-4701, Vol. 10, nr 2, artikkel-id 245Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The effect of sign‐alternating cycling polarisation (SACP) on the localised corrosion of X70pipeline steel in solutions of various compositions was studied. Localised corrosion of steel at anodic potentials was accelerated with an increase in the duration of the cathodic half‐cycle, in the presence of a promoter of hydrogen absorption in aqueous electrolyte, and with an increase in the concentrations of chloride and bicarbonate ions. It was pointed out that the corrosion rate is determined by the amount of hydrogen absorbed by the steel. A quantitative indicator to determine the intensity of localised corrosion under SACP was suggested. © 2020 by the authors. 

  • 8.
    Siafakas, Dimitrios
    et al.
    Jönköping University, Sweden.
    Matsushita, Taishi
    Jönköping University, Sweden.
    Lauenstein, Åsa
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, SWECAST.
    Ekengård, Johan
    Sandvik SRP, Sweden.
    Jarfors, Anders E. W.
    Jönköping University, Sweden.
    The influence of deoxidation practice on the as-cast grain size of austenitic manganese steels2017Inngår i: Metals, ISSN 2075-4701, Vol. 7, nr 6, artikkel-id 186Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The effect of in-situ precipitating particles on the grain size of Al-Ti-treated and untreated Hadfield steel cast in a pilot scale environment was studied. Hadfield steel was melted in an induction furnace and cast in Y-Block samples. Light Optical Microscopy (LOM) and the intercept method were utilized for the grain size measurements. Additionally, Thermo-Calc Software TCFE7 Steels/Fe-alloys database version 7 was used for thermodynamic equilibrium calculations of the mole fraction of particles. The planar disregistry values between the austenite and the precipitating particles were calculated. It was observed that increasing oxide content in samples with low Ti(CN) content resulted in a finer microstructure, while increasing the Ti(CN) content under similar oxide content levels led to a coarser microstructure. The potency of each type of particle to nucleate austenitic grains was determined. Spinel (MnAl2O4, MgAl2O4) particles were characterized as the most potent, followed by olivine (Mn2SiO4), corundum (Al2O3, TiO2), and finally Ti(CN), the least potent particle.

    Fulltekst (pdf)
    fulltext
  • 9.
    Zamani, Mohammadreza
    et al.
    Jönköping University, Sweden.
    Belov, Ilia
    Jönköping University, Sweden.
    Sjölander, Emma
    Scania CV AB, Sweden.
    Bjurenstedt, Anton
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Ghassemali, Ehsan
    Jönköping University, Sweden.
    Seifeddine, Salem
    Jönköping University, Sweden.
    Study on dissolution of Al2Cu in al-4.3cu and a205 cast alloys2020Inngår i: Metals, ISSN 2075-4701, Vol. 10, nr 7, artikkel-id 900Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Evolution of microstructure in a binary Al-Cu system (Al-4.3Cu) and a commercially alloyed Al-Cu system (A205) during solution heat treatment was investigated using optical microscopy (OM), scanning electron microscopy (SEM), wavelength-dispersive X-ray spectroscopy (WDS), and differential scanning calorimetry (DSC). The diversified coarseness of the microstructure was initiated by controlling the solidification rate. Different solution treatment temperatures were applied to identify a proper solutioning temperature. The larger microstructural scale required an increased solutioning temperature and prolonged holding time to obtain homogenized solutes in the α-Al matrix. The diffusion of Cu primarily controlled the solution heat treatment process. A diffusion-based model was applied and calibrated to determine the dissolution rate of an Al2Cu particle in the matrix. The model operates on a similar time scale with the experimental results for the Al-4.3Cu and A205 alloys with various microstructural scales, different chemical compositions, and at different solution treatment temperatures. Three-dimensional (3D) reconstructed images from SEM images and energy dispersive spectroscopy (EDS) map of elements showed that TiB2 particles shield the Cu-rich phases in the boundaries of α-Al grains, presumably acting as a physical barrier to the diffusion of Cu solutes toward α-Al grains. The model also suggests that the effective diffusion coefficient of Cu in Al, in the presence of TiB2 particles, reduced by a factor of 2.0–2.5 in the A205 alloy compared with the binary Al-Cu alloy. © 2020 by the authors.

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