期刊
METALS
卷 8, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/met8100742
关键词
TRIP; TWIP steel; warm rolling; martensitic transformation; deformation twin; yield strength; tensile deformation behavior
资金
- National Natural Science Foundation of China [51705129]
- Natural Science Foundation of Hebei Province [E2016202121]
- Hebei Province Education Department Science and Technology Research Project [BJ2017009]
- Foundation for High-level Talents in Higher Education of Hebei, China [GCC2014012]
- State Key Lab of Advanced Metals and Materials [2017-Z02]
The effects of warm rolling reduction ratio ranging from 20% to 55% on microstructure evolution, the tensile deformation mechanism, and the associated mechanical properties of an Fe-30Mn-4Si-2Al TRIP/TWIP steel were studied. The warm rolling process resulted in the formation and proliferation of sub-structure, comprising dislocations, deformation twins as well as shear bands, and the densities of dislocation and twins were raised along with the increase in rolling reduction. The investigated steel, with a fully recrystallized state, exhibited a single epsilon-TRIP effect during the room temperature tensile deformation, on top of dislocation glide. However, the formation and growth of twin lamellae and epsilon-martensite were detected simultaneously during tensile deformation of the warm rolled specimen with rolling reduction of 35%, leading to a good balance between high yield strength of 785 MPa, good total ductility of 44%, and high work hardening rate. As the rolling reduction increased to 55%, the specimen revealed a relatively low work hardening rate, due to the high dislocation density, and dislocation glide was the main deformation mechanism. As a result, a tensile deformation mechanism that started from a single epsilon-martensitic transformation moved to a bi-mode of epsilon-martensitic transformation accompanied with deformation twinning, and finally to dislocation glide with the increasing warm rolling reduction was proposed.
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