Formability of strong metastable Fe–15Cr–3Mn–3Ni–0.2C–0.1N austenitic TRIP/(TWIP) steel – A comparison of different base materials

Pranke, Katja; Wendler, Marco; Weidner, Anja; Guk, Sergey; Weiß, Andreas; Kawalla, Rudolf

doi:10.1016/j.jallcom.2015.06.205

Cited by 18 publications

(7 citation statements)

References 32 publications

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“…Its segregation may lead to undesirable phase transformations during the welding cycle, especially martensitic transformation due to its high C content. Martensitic transformation may be undesirable in TWIP steels for three main reasons: (i) it is a source of tensile residual stresses, as volumetric changes are associated with it, (ii) the material may lose its twinning capacity, which is responsible for the combination of high strength and ductility that characterizes the material and (iii) martensite transformationimpairs toughness and also may facilitate the occurrence of delayed fracture, which has also been reported for TWIP steels [13][14][15]. As can be seen in Erro!…”

Section: 1microstructural Features Of the Weld Spotsmentioning

confidence: 96%

Características Microestruturais, Modos De Falha E Propriedades Mecânicas De Aços Twip Soldados Por Soldagem a Ponto Por Resistência

Colombo¹,

Santos²,

Otubo³

et al. 2019

ABM Proceedings

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Resumo Chapas de aço TWIP980 foram soldadas por soldagem a ponto por resistência com diferentes parâmetros de processo. A microestrutura pós-soldagem foi caracterizada e as propriedades mecânicas das juntas soldadas foram avaliadas. Para cada condição de processo, os modos de falha foram identificados e correlacionados com as propriedades mecânicas. Não foram identificadas regiões de segregação de manganês, indicando que o material pós-soldado mantém sua microestrutura austenítica, o que foi confirmado por difractogramas de raios-x e micrografias ópticas.Mapas de microindentação mostraram uma distribuição heterogênea de propriedades mecânicas ao longo da junta soldada. Além disto, a região mais macia localiza-se na zona de fusão da solda, favorecendo modos de falha frágeis, o que foi identificado através de ensaios mecânicos de tração-cisalhamento. No entanto, ajustes de parâmetros de processo mostraram-se eficazes para promover outros modos de falhas, inclusive falha dúctil, o que foi confirmado através de micrografias eletrônicas. Os resultados também mostraram que a resistência mecânica e a capacidade de absorção de energia das juntas estão diretamente relacionados com os parâmetros de processo e modos de falha.

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Section: 1microstructural Features Of the Weld Spotsmentioning

confidence: 96%

Características Microestruturais, Modos De Falha E Propriedades Mecânicas De Aços Twip Soldados Por Soldagem a Ponto Por Resistência

Colombo¹,

Santos²,

Otubo³

et al. 2019

ABM Proceedings

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“…As the microhardness of the martensitic phase fractions is higher than the microhardness of the initially existent γ-austenite, this deformation-induced phase transformation contributes to the hardening of the surface layer. According to Pranke et al (2015), the microhardness increases linearly with the phase fraction of martensite. Zhang et al (2018b) demonstrated that the increase in microhardness caused by phase transformation as well as the microhardness increase caused by strain hardening superimpose additively.…”

Section: Introductionmentioning

confidence: 99%

Impact of the thermomechanical load on subsurface phase transformations during cryogenic turning of metastable austenitic steels

2020

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When machining metastable austenitic stainless steel with cryogenic cooling, a deformation-induced phase transformation from γ-austenite to α′-martensite can be realized in the workpiece subsurface. This leads to a higher microhardness and thus improved fatigue and wear resistance. A parametric and a non-parametric model were developed in order to investigate the correlation between the thermomechanical load in the workpiece subsurface and the resulting α′-martensite content. It was demonstrated that increasing passive forces and cutting forces promoted the deformation-induced phase transformation, while increasing temperatures had an inhibiting effect. The feed force had no significant influence on the α′-martensite content. With the proposed models it is now possible to estimate the α′-martensite content during cryogenic turning by means of in-situ measurement of process forces and temperatures.

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“…Defects are, for instance, surface cracking or microstructure inhomogeneity causing a mixed grain size. Hence, the stability of a sophisticated quality level of austenitic steels cannot be ensured . To ensure the customized products, the flow behavior and microstructure evolution during hot deformation process need to be controlled.…”

Section: Introductionmentioning

confidence: 99%

The Kinetics of Dynamic Recrystallization of Fe–16Cr–xMn–4Ni–0.05C–0.17N Steel

Nam

Turdimatov

Kawalla

et al. 2018

steel research int.

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The paper studies the dynamic recrystallization of nitrogen‐alloyed low‐nickel Fe–16Cr–xMn–4Ni–0.05C–0.17N stainless steel in dependence of Mn with different contents from 2 to 6 wt% by isothermal compression tests. The tests are performed at three temperatures 970, 1050, 1150 °C and three strain rates 0.1, 1, and 10 s−1 on a Gleeble HDS V40. By means of the experimental results, it could be shown that various Mn content has only a slight effect on the peak stress and peak strain. The critical stress indicating the onset of dynamic recrystallization is determined by second derivative of the third‐order polynomial. The dynamic recrystallization is modeled based on the JMAK equations, which is expanded by means of including the linear dependency of material constants of the Mn content. The predicted DRX curves exhibit good agreement with the experimental ones.

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Formability of strong metastable Fe–15Cr–3Mn–3Ni–0.2C–0.1N austenitic TRIP/(TWIP) steel – A comparison of different base materials

Cited by 18 publications

References 32 publications

Características Microestruturais, Modos De Falha E Propriedades Mecânicas De Aços Twip Soldados Por Soldagem a Ponto Por Resistência

Características Microestruturais, Modos De Falha E Propriedades Mecânicas De Aços Twip Soldados Por Soldagem a Ponto Por Resistência

Impact of the thermomechanical load on subsurface phase transformations during cryogenic turning of metastable austenitic steels

The Kinetics of Dynamic Recrystallization of Fe–16Cr–xMn–4Ni–0.05C–0.17N Steel

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