Thermodynamic-Mechanical Modeling of Strain-Induced α′-Martensite Formation in Austenitic Cr–Mn–Ni As-Cast Steel

Authors


  • The authors would like to thank all of the staff involved in the collaborative research centre 799, especially Dipl.-Wi.-Ing. Steffen Wolf for the carrying out of the tensile tests, and the German Research Foundation (DFG) for financial support of these investigations.

Abstract

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The microstructure evolution during deformation and the mechanical behavior of an austenitic Cr–Mn–Ni as cast steel are investigated at various temperatures. The deformation-induced twinning and ϵ/α′-martensite formation – the TWIP and TRIP effects – occur in the investigate steel depending on the deformation temperature. For characterization and illustration of the TRIP/TWIP effects the STT and DTT diagrams are developed. Finally, the α′-martensite nucleation threshold is determined, and an equation is proposed to describe the volume fraction of strain-induced α′-martensite as a function of the total driving force.

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