Tensile Behavior of Intercritically Annealed Ultra-Fine Grained 8% Mn Multi-Phase Steel

被引：62
作者：
Lee, Sangwon [1 ]
De Cooman, Bruno C. [1 ]
机构：
[1] Pohang Univ Sci & Technol, Grad Inst Ferrous Technol, Pohang, South Korea
来源：
STEEL RESEARCH INTERNATIONAL | 2015年 / 86卷 / 10期
关键词：
medium Mn steel; TWIP effect; TRIP effect; INDUCED PLASTICITY STEEL; MECHANICAL-PROPERTIES; TRIP STEEL; TRANSFORMATION; MICROSTRUCTURES; TEMPERATURE; MARTENSITE;
D O I：
10.1002/srin.201500038
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The room temperature tensile behavior of intercritically annealed hot-rolled Fe-8%Mn-0.4%C-3%Al-2%Si-(0-0.2)%V steel, with an ultra-fine grained austeno-ferritic microstructure was investigated. An initial athermal martensite microstructure provided a high density of ferrite nucleation sites during intercritical annealing, resulting in an ultrafine grained microstructure. Carbon and manganese were partitioned to austenite during intercritical annealing. The austenite phase exhibited the plasticity-enhancing TWIP + TRIP effect, i.e., deformation twinning and strain-induced martensite transformation occurring in succession, which resulted in a superior work hardening rate. The intercritically annealed hot-rolled Fe-8%Mn-0.4%C-3%Al-2%Si-0.2%V steel exhibited a total elongation of 40%, a yield strength of 920 MPa, and tensile strength of 1200 MPa.
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页码：1170 / 1178
页数：9
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