Constitutive modelling of the rate dependent flow stress of cast high-alloyed metastable austenitic TRIP/TWIP steel
作者： Steffen Wolf , Stefan Martin , Lutz Krüger , Ulrich Martin
DOI: 10.1016/J.MSEA.2013.11.041
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摘要: Abstract The influence of strain rate and temperature on the resulting mechanical behaviour a cast metastable austenitic CrMnNi–TRIP/TWIP steel was investigated. At ambient below, formation α′-martensite dominates causing pronounced hardening. Various analytical models are available in literature mostly based rule mixture concepts (e.g. Ludwigson Berger [22] Narutani et al. [25] ). These were developed for commercial alloys with medium stacking fault energy (SFE). However, herein-investigated alloy very low SFE these found to be limited describing dependent material behaviour. A new model is presented predicting flow stress incorporating sensitivity, transformation strain, martensite kinetics adiabatic heating.
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