Microstructure and Mechanical Properties of Hot-Rolled and Cold-Rolled Medium-Mn TRIP Steels

被引:30
作者
Liu, Chunquan [1 ,2 ]
Peng, Qichun [1 ,2 ]
Xue, Zhengliang [1 ,2 ]
Wang, Shijie [1 ,2 ]
Yang, Chengwei [3 ]
机构
[1] Wuhan Univ Sci & Technol, State Key Lab Refractories & Met, Wuhan 430081, Hubei, Peoples R China
[2] Wuhan Univ Sci & Technol, Minist Educ, Key Lab Ferrous Met & Resources Utilizat, Wuhan 430081, Hubei, Peoples R China
[3] Wuhan Baosteel Cent Res Inst, Wuhan 430083, Hubei, Peoples R China
来源
MATERIALS | 2018年 / 11卷 / 11期
关键词
medium Mn steel; mechanical properties; TRIP steel; austenite stability; fracture; DEFORMATION-BEHAVIOR; TENSILE PROPERTIES; HIGH-STRENGTH; AUSTENITE STABILITY; TRANSFORMATION; DUCTILITY;
D O I
10.3390/ma11112242
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This study investigated the microstructure and mechanical properties of hot-rolled and cold-rolled medium-Mn transformation-induced plasticity (TRIP) steel. The experimental steel, processed by quenching and tempering (Q & T) heat treatment, exhibited excellent mechanical properties for hot-rolled and Q & T steels (strength of 1050-1130 MPa and ductility of 16-34%), as well as for cold-rolled and Q & T steels (strength of 878-1373 MPa and ductility of 18-40%). The mechanical properties obtained after isothermal holding at 775 degrees C for one hour for cold-rolled/Q & T steel were superior to that of hot-rolled/Q & T steel. Excellent mechanical properties were attributed to the large amount of retained austenite, which produced a discontinuous TRIP effect. Additionally, the differences in mechanical properties correlated with the morphology, stability and content of retained austenite. The cold-rolled sample, quenched from 650 degrees C (CR 650 degrees C) had extensive TRIP effects in the middle and late stages of the deformation, leading to better mechanical properties. The fracture modes of the hot-rolled sample, quenched from 650 degrees C, and the cold-rolled sample quenched from 650 degrees C, were ductile fractures, resulting in excellent ductility.
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页数:12
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