MICROSTRUCTURE CONTROL OF HOT ROLLED TRIP STEEL BASED ON DYNAMIC TRANSFORMATION OF UNDERCOOLED AUSTENITE II. Cooling Rate After Dynamic Transformation of Undercooled Austenite

被引：3

作者：

Yin Yunyang ^{[1
,3
]}

Yang Wangyue ^{[1
]}

Li Longfei ^{[2
]}

Sun Zuqing ^{[2
]}

Wang Xilao ^{[2
]}

机构：

[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China

[2] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

[3] Wuhan Iron & Steel Grp Corp, Ctr Res & Dev, Wuhan 430080, Peoples R China

来源：

ACTA METALLURGICA SINICA | 2010年 / 46卷 / 02期

关键词：

hot rolled TRIP steel; dynamic transformation of undercooled austenite (DTUA); cooling rate; microstructure; mechanical property; RETAINED AUSTENITE; MECHANICAL-PROPERTIES; DEFORMATION; SI; ALUMINUM; SILICON;

D O I：

10.3724/SP.J.1037.2009.00432

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

TRIP-aides steels are ideal for lightweight automotive applications due to their high strength and ductility. Thermomechanical processing simulations were performed by hot compression on a Gleeble-1500 machine, in order to develop a comprehensive understanding of the effect of cooling rate after dynamic transformation of undercooled austenite (DTUA) on the microstructure evolution and mechanical properties of 0.2C-1.5Mn-0.5Si-1.0Al (mass faction, %) transformation-induced plasticity (TRIP) steel. The results show that the metastable austenite would be transformed to ferrite mainly by means of nucleation during cooling after DTUA. Decreasing the cooling rate after DTUA, the volume fraction of ferrite increase, the static recovery of dislocations in ferrite produced during dynamic transformation could fully take place, thus the density of dislocations in ferrite decreased through by rearranging and merging, but the gram size of ferrite changes little. At the cooling rate of 30 degrees C/s, the investigated steel has a moderate volume fraction of ferrite and dislocation density in ferrite and a higher volume fraction of retained austenite, resulting in the steel having a higher strength and plasticity.

引用

页码：161 / 166

页数：6

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