Research Status of High Manganese TWIP Steel for Automotive Industry
LAN Peng1,2，DU Chen-wei1,2，JI Yuan1,2，ZHANG Jia-quan1,2
1.State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing， Beijing 100083， China 2. School of Metallurgical and Ecological Engineering，University of Science and Technology Beijing， Beijing 100083, China
Abstract：The plastic mechanism of high manganese TWIP steel is closely related to its stacking fault energy (SFE). Results on determination of TWIP steel stacking fault energy from experiment and thermodynamic calculation are different, and the SFE range in which TWIP effect occurs is also not consistent among various studies. It is liable to observe the porosity and segregation defects in as cast TWIP steel because of the large margin between liquidus and solidus. The reduction of area for as cast TWIP steel is below 40%, which possibly leads to dendrites cracks during bending and straightening process in conventional continuous casting. Horizontal continuous casting and twin roll strip casting show distinctive advantages in TWIP steel casting. The temperature range for TWIP steel hot rolling is very narrow which is resulted from the low solidus and weak hot ductility. Annealing temperature and time after cold rolling are still in laboratory research stage. The strengthening mechanism for Fe-Mn-Si-Al TWIP steel is mainly due to the dynamic Hall-Petch effect by deformation twins, while for Fe-Mn-C(-Al) TWIP steel, dynamic strain aging should be the primary factor. Al alloying in TWIP steel is helpful to improve the delayed fracture resistance of TWIP steel, attributed to the α-Al2O3 layer under specimen surface which can prevent hydrogen diffusion.
兰鹏 杜辰伟 纪元 张家泉 . 汽车用高锰TWIP钢的研究现状[J]. 中国冶金, 2014, 25(07): 6-16.
LAN Peng，DU Chen-wei，JI Yuan，ZHANG Jia-quan,. Research Status of High Manganese TWIP Steel for Automotive Industry. China Metallurgy, 2014, 25(07): 6-16.
2014, Vol. 25 
