Change search
Refine search result
1 - 14 of 14
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Komenda, Jacek
    et al.
    RISE, Swerea, KIMAB.
    Martin, David
    RISE, Swerea, KIMAB.
    Lönnqvist, Johan
    RISE, Swerea, KIMAB.
    The effect of boron addition on precipitation and hot ductility of 1.5Mn-0.1Nb-Ti carbon steels in As-cast condition2016In: Materials Science Forum, 2016, Vol. 879, p. 990-995Conference paper (Refereed)
    Abstract [en]

    Twelve experimental steels with a base composition 1.5wt% Mn, 0.01 wt% V and 0.1 wt% Nb and varying C (0.05, 010 and 0.20 wt%), Ti (20 - 260 ppm) and B (0 - 100 ppm) contents have been systematically examined to quantify the effects of composition on precipitation behavio-ur and hot ductility during simulated continuous casting conditions. Nb-rich precipitates were present in the alloys with 0.10 wt-% C and 0.20 wt-% C. Alloys with 0.05, 010 and 0.20wt% C contained 50 - 100 nm size Ti-Nb carbonitrides. Boron was bound in 20 - 100 nm size boronitrides located in prior austenite grain boundaries. A Gleeble 3800 was used to study hot ductility and strain induced precipitation processes in the alloys. Alloys without B and Ti additions exhibited poor hot ductility at 850°C and 950°C, whereas the 0.05 wt-% C and 0.10 wt-% C alloys showed improved hot ductility (reduction in area 40-50%) by the addition of either >50 ppm B or 250 ppm Ti. The 0.2 wt-% C alloys showed no improvement from B or Ti additions. Examination of fracture surfaces of hot ductility specimens showed that boronitrides were located at prior austenite grain boundaries in alloys containing 80 - 100 ppm of B. Compression-relaxation tests showed that alloying with boron caused a noticeable decrease of the start temperature of straininduced precipitation in the alloys.

  • 2.
    Marshakov, A. I.
    et al.
    Russian Academy of Sciences, Russia.
    Rybkina, A. A.
    Russian Academy of Sciences, Russia.
    Maksaeva, L. B.
    Russian Academy of Sciences, Russia.
    Petrunin, M. A.
    Russian Academy of Sciences, Russia.
    Nazarov, Andrej
    RISE, Swerea, KIMAB.
    A study of the initial stages of iron passivation in neutral solutions using the quartz crystal resonator technique2016In: Protection of Metals and Physical Chemistry of Surfaces, ISSN 2070-2051, Vol. 52, no 5, p. 936-946Article in journal (Refereed)
    Abstract [en]

    The initial period of growth of a passive film of iron in borate solutions (pH 7.4 and 6.7) is studied using the quartz crystal resonator technique (EQSN) and pulsed chronoamperometry. Dependences of the surface layer thickness on time are obtained at the metal passivation and prepassivation potentials. Regions corresponding to different stages of passive layer formation are found in anodic current transients, which allowed the ambiguous effect of atomic hydrogen on kinetics of hydrogenated iron dissolution to be explained. It is shown that the iron hydrogenation promoter prevents formation of a primary passive film by accelerating iron dissolution at prepassivation potentials.

  • 3.
    Nazarov, Andrej
    et al.
    RISE, Swerea, KIMAB.
    Marshakov, A. I.
    Russian Academy of Sciences, Russia.
    Rybkina, A. A.
    Russian Academy of Sciences, Russia.
    Iron hydrogenation under atmospheric corrosion. Studies using a scanning vibrating microscope2015In: Protection of Metals and Physical Chemistry of Surfaces, ISSN 2070-2051, Vol. 51, no 3, p. 347-359Article in journal (Refereed)
    Abstract [en]

    A scanning vibrating capacitor (SVC, Kelvin probe) is used to study hydrogenation of iron and steel under the conditions of atmospheric corrosion. It is shown that hydrogen that forms in the course of corrosion or under cathodic polarization diffuses through the membrane and interacts with its opposite side, causing a decrease in the surface Volta potential. It is proposed that atomic hydrogen reduces Fe3+ ions in the passive film. It is shown that the SVC technique is informative for registration of local regions of hydrogenated metal at very low hydrogen flow into steel.

  • 4.
    Prosek, Tomas
    et al.
    RISE, Swerea, KIMAB.
    Hagström, Joacim
    RISE, Swerea, KIMAB.
    Persson, Dan
    RISE, Swerea, KIMAB.
    Fuertes, Nuria
    RISE, Swerea, KIMAB.
    Lindberg, Fredrik
    RISE, Swerea, KIMAB.
    Chocholatý, Ondrej
    University of West Bohemia, Czech Republic.
    Taxen, Claes
    RISE, Swerea, KIMAB.
    Serak, Jan
    University of Chemistry and Technology, Czech Republic.
    Thierry, Dominique
    RISE, Swerea, KIMAB.
    Effect of the microstructure of Zn-Al and Zn-Al-Mg model alloys on corrosion stability2016In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 110, p. 71-81Article in journal (Refereed)
    Abstract [en]

    Zn-5Al and Zn-3Al-2Mg model alloys were cast and heat treated in order to obtain specimens with distinct microstructures and identical chemical compositions. The microstructure was characterised in detail to identify composition, size and distribution of present phases. Mass losses of samples with different microstructures and identical chemical compositions that were subjected to a cyclic corrosion test and a test under non-rinsing conditions differed by a factor of up to two. The mechanism is discussed based on measurements of corrosion stability of individual phases and chemical and phase compositions of corrosion products.

  • 5.
    Prosek, Tomas
    et al.
    RISE, Swerea, KIMAB.
    Nazarov, Andrej
    RISE, Swerea, KIMAB.
    Goodwin, F.
    International Zinc Association, USA.
    Serak, J.
    University of Chemistry and Technology Prague, Czech Republic.
    Thierry, Dominique
    RISE, Swerea, KIMAB.
    Improving corrosion stability of Zn[sbnd]Al[sbnd]Mg by alloying for protection of car bodies2016In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 306, p. 439-447Article in journal (Refereed)
    Abstract [en]

    Aluminium and magnesium are known for their ability to improve corrosion performance of zinc coatings used for steel protection in automotive applications. To investigate the inhibiting properties of other elements, series of model Zn[sbnd]X, Zn[sbnd]Al[sbnd]X, Zn[sbnd]Mg[sbnd]X and Zn[sbnd]Al[sbnd]Mg[sbnd]X alloys containing 0.2–2 wt% of titanium, mischmetal (mixture of cerium and other lanthanides), zirconium, molybdenum, chromium, boron, gallium, indium, copper, nickel, calcium, manganese and silicon were prepared and their corrosion performance in a cyclic accelerated test and at a marine field site and the ability to provide galvanic protection to steel in defects were characterized. On openly exposed surfaces, none of the investigated elements showed stronger inhibiting effect on atmospheric corrosion than Al and Mg. When exposed to marine climate, it was beneficial to combine Al and Mg. The corrosion stability of Zn[sbnd]Al[sbnd]Mg was further improved by addition of a fourth element. Quaternary Zn[sbnd]Al[sbnd]Mg[sbnd]X alloys outperformed binary Zn[sbnd]X and ternary Zn[sbnd]Al[sbnd]X and Zn[sbnd]Mg[sbnd]X alloys. In average, mass loss was 4-fold higher in confined zones simulating hem flanges. Strong inhibition with Mg and detrimental effects of Al on corrosion in confined zones was found. Several quaternary Zn[sbnd]Al[sbnd]Mg[sbnd]X alloys with improved corrosion stability in both open and confined configurations were identified

  • 6.
    Prosek, Tomas
    et al.
    RISE, Swerea, KIMAB.
    Nazarov, Andrej
    RISE, Swerea, KIMAB.
    Le Gac, Anne
    RISE, Swerea, KIMAB.
    Thierry, Dominique
    RISE, Swerea, KIMAB.
    Coil-coated Zn-Mg and Zn-Al-Mg: Effect of climatic parameters on the corrosion at cut edges2015In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 83, p. 26-35Article in journal (Refereed)
    Abstract [en]

    We studied the effect of temperature, wet/dry cycling, pH, and the type and concentration of the corrosion activator on cut edge corrosion of painted Zn-15Mg and Zn-1.5Al-1.5Mg coated steel. In most accelerated tests, paint delamination and red rust formation were reduced compared to hot dip galvanised steel (HDG), and Zn-15Mg outperformed Zn-1.5Al-1.5Mg; however, Zn-1.5Al-1.5Mg showed better results when exposed outdoors. The alloyed materials were particularly resistant when HDG was prone to elevated corrosion, i.e. under permanent wetness, at higher temperatures, with high chloride loadings and in the presence of sulphate. Oxygen reduction on steel cut edges was inhibited by the alloying elements.

  • 7.
    Prosek, Tomas
    et al.
    RISE, Swerea, KIMAB.
    Nazarov, Andrej
    RISE, Swerea, KIMAB.
    Thierry, Dominique
    RISE, Swerea, KIMAB.
    Role of steel and zinc coating thickness in cut edge corrosion of coil coated materials in atmospheric weathering conditions; Part 2: Field data and model2016In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 101, p. 45-50Article in journal (Refereed)
    Abstract [en]

    Paint delamination from cut edges of model coil coated hot dip galvanized materials exposed at a marine test site for 5 years increased with steel thickness and decreased with zinc coating thickness. It was larger in sheltered locations than for openly exposed cut edges whereas red rust protection was more efficient on sheltered edges due to higher electric conductivity of deposits. The rate of paint delamination increased or decreased in time depending on the relative amount of zinc ions available for formation of the protective film on steel controlled by the initial steel substrate and zinc coating thicknesses. 

  • 8.
    Prosek, Tomas
    et al.
    RISE, Swerea, KIMAB.
    Nazarov, Andrej
    RISE, Swerea, KIMAB.
    Xue, HB
    Universidade de Lisboa, Portugal.
    Lamaka, S.
    Universidade de Lisboa, Portugal; Institute of Materials Research, Germany.
    Thierry, Dominique
    RISE, Swerea, KIMAB.
    Role of steel and zinc coating thickness in cut edge corrosion of coil coated materials in atmospheric weathering conditions; Part 1: Laboratory study2016In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 99, p. 356-364Article in journal (Refereed)
    Abstract [en]

    Cathode surface area and its ability to reduce oxygen controlled the rate of zinc dissolution and paint delamination from cut edges of hot dip galvanised steel sheets. Zinc corrosion products deposited on steel in atmospheric exposure conditions inhibited oxygen reduction decreasing galvanic current and zinc dissolution and paint delamination. The opposite effect was observed for iron corrosion products. The initial steel substrate and zinc coating thicknesses affected the availability of zinc ions for formation of the protective film.

  • 9.
    Stormvinter, Albin
    et al.
    RISE - Research Institutes of Sweden, Materials and Production, IVF, Tillverkningsprocesser.
    Kristoffersen, Hans
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Troell, Eva
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Senaneuch, Jérôme
    RISE, Swerea, KIMAB.
    Haglund, Sven
    RISE, Swerea, KIMAB.
    Impact of internal oxidation and quenching path on fatigue of powertrain components2015In: Heat Treating 2015: Proceedings of the 28th ASM Heat Treating Society Conference, 2015, p. 498-503Conference paper (Refereed)
    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. 

  • 10.
    Sullivan, James
    et al.
    Swansea University, UK.
    Cooze, Nathan
    Swansea University, UK.
    Gallagher, Callum
    Swansea University, UK.
    Lewis, Tom
    Swansea University, UK.
    Prosek, Tomas
    RISE, Swerea, KIMAB.
    Thierry, Dominique
    RISE, Swerea, KIMAB.
    In situ monitoring of corrosion mechanisms and phosphate inhibitor surface deposition during corrosion of zinc-magnesium-aluminium (ZMA) alloys using novel time-lapse microscopy2015In: Faraday discussions (Online), ISSN 1359-6640, E-ISSN 1364-5498, Vol. 180, p. 361-379Article in journal (Refereed)
    Abstract [en]

    In situ time-lapse optical microscopy was used to examine the microstructural corrosion mechanisms in three zinc-magnesium-aluminium (ZMA) alloy coated steels immersed in 1% NaCl pH 7. Preferential corrosion of MgZn<inf>2</inf> lamellae within the eutectic phases was observed in all the ZMA alloys followed by subsequent dissolution of Zn rich phases. The total extent and rate of corrosion, measured using time-lapse image analysis and scanning vibrating electrode technique (SVET) estimated mass loss, decreased as Mg and Al alloying additions were increased up to a level of 3 wt% Mg and 3.7 wt% Al. This was probably due to the increased presence of MgO and Al<inf>2</inf>O<inf>3</inf> at the alloy surface retarding the kinetics of cathodic oxygen reduction. The addition of 1 × 10-2 mol dm-3 Na<inf>3</inf>PO<inf>4</inf> to 1% NaCl pH 7 had a dramatic influence on the corrosion mechanism for a ZMA with passivation of anodic sites through phosphate precipitation observed using time-lapse image analysis. Intriguing rapid precipitation of filamentous phosphate was also observed and it is postulated that these filaments nucleate and grow due to super saturation effects. Polarisation experiments showed that the addition of 1 × 10-2 mol dm-3 Na<inf>3</inf>PO<inf>4</inf> to the 1% NaCl electrolyte promoted an anodic shift of 50 mV in open circuit potential for the ZMA alloy with a reduction in anodic current of 2.5 orders of magnitude suggesting that it was acting primarily as an anodic inhibitor supporting the inferences from the time-lapse investigations. These phosphate additions resulted in a 98% reduction in estimated mass loss as measured by SVET demonstrating the effectiveness of phosphate inhibitors for this alloy system.

  • 11.
    Thierry, Dominique
    et al.
    RISE, Swerea, KIMAB.
    Vucko, Flavien
    RISE, Swerea, KIMAB.
    Luckeneder, G.
    voestalpine Stahl GmbH, Austria.
    Weber, B.
    Arcelor Mittal Maizieres Research SA, France.
    Dosdat, L.
    Arcelor Mittal Maizieres Research SA, France.
    Bschorr, T.
    GSI GmbH, Germany.
    Rother, K.
    Munich University of Applied Sciences, German.
    Fatigue behavior of spot-welded joints in air and under corrosive environments: Part II: Fatigue under alternating and combined corrosion and fatigue load2016In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 60, no 6, p. 1231-1245Article in journal (Refereed)
    Abstract [en]

    The main aim of the project was to evaluate the influence of combined effects of fatigue loading and exposure to cyclic corrosion testing on the corrosion and the fatigue resistances of coated steel-based materials joined by resistance spot welding. Seven steel-based materials including cold rolled mild steels, high-strength steels, and press-hardened steels (PHS) were selected and provided by steel suppliers with different surface coatings for resistance spot welding. Panels were joined using conventional resistance spot welding in both lap-shear and T-peel designs. Joined samples were painted by e-coating following the industrial process. Metallographic characterization of the steel materials revealed that microstructures and metallic coating composition and thickness were as expected. Cross section of spot welds showed good quality and typical evolutions of hardness. Tensile tests and fatigue tests were performed on reference samples (fatigue in “air,” i.e., nonexposed to corrosion) leading to typical SN-lines as described in part I of this paper. The results were used to evaluate the influence of corrosion on tensile strength of the joined samples. Fatigue tests performed on combined and alternating corrosion and fatigue revealed that fatigue life is affected by extent of corrosion near the spot weld, with a reduction of the fatigue life at higher applied load and slight increase for lower load, compared to tests “in air.” This phenomenon was not observed for lap-shear configuration in alternated fatigue-corrosion mode. 

  • 12.
    Thierry, Dominique
    et al.
    RISE, Swerea, KIMAB.
    Vucko, Flavien
    RISE, Swerea, KIMAB.
    Luckeneder, Gerald
    Voestalpine Stahl GmbH, Austria.
    Weber, Bastien
    Arcelor Mittal Maizieres Research SA, France.
    Dosdat, Laurence
    Arcelor Mittal Maizieres Research SA, France.
    Bschorr, Thomas
    GSI GmbH, Germany.
    Rother, Klemens
    Munich University of Applied Sciences, Germany.
    Fatigue behavior of spot-welded joints in air and under corrosive environments: Part I: Materials, specimen and test results in air2016In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 60, no 6, p. 1211-1229Article in journal (Refereed)
    Abstract [en]

    The main aim of the project was to evaluate the influence of combined effects of fatigue loading and exposure to cyclic corrosion testing on the corrosion and the fatigue resistances of coated thin sheet steel joined by spot welding. Seven types of steel including cold rolled mild steels, high-strength steels, and press-hardened steels (PHS) were selected and provided by steel suppliers for fatigue strength evaluation of resistance spot welding (RSW) assemblies. Panels were joined using conventional resistance spot welding in both lap-shear and T-peel designs. Joined samples were painted by e-coating following the industrial process. Metallographic characterization of the steels revealed that microstructures and metallic coating composition and thickness were as expected. Cross-section of spot welds showed good quality and typical evolutions of hardness. Tensile tests performed on reference samples (non-exposed to corrosion) showed tensile which were obviously configuration and material dependent. For each configuration, three replicates were tested and did not show significant scatter. The results were and will be used to evaluate the influence of corrosion on tensile strength of the joined samples. Fatigue tests were performed “in air”, meaning without corrosion exposition, leading to typical SN-lines. The results will be used to evaluate the influence of corrosion on the fatigue resistance of the joined samples. 

  • 13.
    Vucko, Flavien
    et al.
    RISE, Swerea, KIMAB.
    LeBozec, Nathalie
    RISE, Swerea, KIMAB.
    Thierry, Dominique
    RISE, Swerea, KIMAB.
    Weber, B.
    ArcelorMittal Maizieres Research SA, France.
    Dosdat, L.
    ArcelorMittal Maizieres Research SA, France.
    Luckeneder, G.
    Voestalpine Stahl GmbH, Austria.
    Bschorr, T.
    Gesellschaft für Schweisstechnik International mbH, Germany.
    Rother, K.
    Munich University of Applied Sciences, Germany.
    Sciaboni, C.
    Centro Sviluppo Materiali SpA, Italy.
    Sczepanski, J.
    Bayerische Motoren Werke AG, Germany.
    Combined corrosion and fatigue performance of joined materials for automotive applications2016In: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176, Vol. 67, no 11, p. 1143-1151Article in journal (Refereed)
    Abstract [en]

    The aim of this study is to evaluate fatigue performance of joined assemblies (spot weld and/or adhesive bonding) in corrosive environment. Various assemblies have been tested in alternated and simultaneous fatigue-corrosion modes. Adhesive joints are strongly affected by simultaneous fatigue-corrosion with a large drop of the fatigue life compared to results in air. By alternating fatigue and corrosion, the reduction of fatigue life is important. For spot welding, fatigue life is decreased at higher load amplitudes and increased at lower amplitudes. These results are strongly linked to the opening of the gap near the spot weld at high load amplitudes. At low amplitudes, corrosion might limit the local stress at the notch root of the weld. 

  • 14.
    Yasri, Maria
    et al.
    RISE, Swerea, KIMAB. Université de Bretagne Occidentale, France.
    Lescop, Benoit
    Université de Bretagne Occidentale, France.
    Diler, Erwan
    RISE, Swerea, KIMAB.
    Gallée, Francois
    Technopôle Brest-Iroise, France.
    Thierry, Dominique
    RISE, Swerea, KIMAB.
    Rioual, Stephane
    Université de Bretagne Occidentale, France.
    Fundamental basis of electromagnetic wave propagation in a zinc microstrip lines during its corrosion2016In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 223, p. 352-358Article in journal (Refereed)
    Abstract [en]

    A new method for corrosion monitoring based on the change of the radiofrequency (RF) wave propagation in a microstrip line during its corrosion is presented. For that purpose, the microstrip line is produced in the same metal as the mechanical structure under monitoring. Zinc material is considered in the study since it allows an investigation of uniform as well as localized corrosion when chloride is used. Experimental data and simulations results provide fundamental basis on the sensing mechanisms of the method and evidence the possibility to detect the created corrosion species and to distinguish between localized and uniform corrosion processes. As the consequence, the proposed method should be considered as promising and reliable tool for corrosion monitoring of several materials exposed to various environments

1 - 14 of 14
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
v. 2.35.8