Load partitioning and strain-induced martensite formation during tensile loading of a metastable austenitic stainless steel

Hedström, PeterKTH,Luleå tekniska universitet,Department of Materials Science and Engineering, Royal Institute of Technology (KTH), Stockholm, Sweden,Materialvetenskap,Luleå University of Technology (author)

Validerad; 2009; 20090429 (ysko)
QC 20110414
In-situ high-energy X-ray diffraction and material modeling are used to investigate the strain-rate dependence of the strain-induced martensitic transformation and the stress partitioning between austenite and α′ martensite in a metastable austenitic stainless steel during tensile loading. Moderate changes of the strain rate alter the strain-induced martensitic transformation, with a significantly lower α′ martensite fraction observed at fracture for a strain rate of 10−2 s−1, as compared to 10−3 s−1. This strain-rate sensitivity is attributed to the adiabatic heating of the samples and is found to be well predicted by the combination of an extended Olson–Cohen strain-induced martensite model and finite-element simulations for the evolving temperature distribution in the samples. In addition, the strain-rate sensitivity affects the deformation behavior of the steel. The α′ martensite transformation at high strains provides local strengthening and extends the time to neck formation. This reinforcement is witnessed by a load transfer from austenite to α′ martensite during loading.

Lindgren, Lars-ErikLuleå tekniska universitet,Material- och solidmekanik,Luleå University of Technology(Swepub:ltu)lel (author)
Almer, J.Advanced Photon Source at Argonne National Laboratory, Argonne, IL, 60439, USA (author)
Lienert, U.Advanced Photon Source at Argonne National Laboratory, Argonne, IL, 60439, USA (author)
Bernier, J.Lawrence Livermore Laboratory, Livermore, CA, 94551, USA,Lawrence Livermore National Laboratory (author)
Terner, MarkLuleå tekniska universitet,Rolls Royce Fuel Cell Syst, Loughborough LE113GR, Leics, England,Luleå University of Technology(Swepub:ltu)marter (author)
Odén, MagnusLinköpings universitet,Nanostrukturerade material,Tekniska högskolan(Swepub:liu)magod41 (author)
Luleå tekniska universitetDepartment of Materials Science and Engineering, Royal Institute of Technology (KTH), Stockholm, Sweden (creator_code:org_t)

In:Metallurgical and Materials Transactions. A: Springer Science and Business Media LLC40:5, s. 1039-10481073-56231543-1940

By the author/editor: Hedström, Peter; Lindgren, Lars-E ...; Almer, J.; Lienert, U.; Bernier, J.; Terner, Mark; show more...; Odén, Magnus; show less...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Other Materials ...

By the university: Luleå University of Technology; Royal Institute of Technology; Linköping University

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