Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 754, Issue -, Pages 152-160Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2019.03.072
Keywords
High-manganese steel; Grain size; Twinning-induced plasticity; Transformation-induced plasticity; Texture development
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Funding
- Deutsche Forschungsgemeinschaft within the Collaborative Research Centre [(SFB) 761]
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The impact of grain size on the work-hardening rate of two high-manganese steels with nearly identical stacking fault energy values of approximately 16.6 mJ m(-2) (X60Mn17 alloy) and 16.5 mJ m(-2) (X30MnAl17-1 alloy) was analyzed via macro-texture and micro-texture measurements as well as quasistatic tensile tests and phase analysis. Both alloys exhibited differences in twin volume fraction and volume fraction of the martensitic phase. The twin volume fraction increased with grain size. The X30MnAl17.1 alloy with Al and lower C content showed a lower overall twin volume fraction than the X60Mn17 alloy without Al. Additionally, the phase fractions of epsilon-martensite and alpha'-martensite were very low in the X3OMnAl17-1 alloy. The increased grain size and the subsequent increase in twin volume fraction led to a relative decrease of the volume fraction of grains with < 111 > -orientation parallel to the tensile axis for both alloys.
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