Analysis of Microstructure and Mechanical Properties of Ultrafine Grained Low Carbon Steel  

作　　者：刘和平 SUN Feng'er SUN Hu'er LIU Bin WANG Yi JIN Xuejun 

机构地区：[1]School of Materials Science and Engineering,North University of China,Taiyuan 030051,China [2]School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China [3]School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2016年第5期1099-1104,共6页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the School Foundation of North University of China;the National Natural Science Foundation of China(Nos.51206081,51571141);Science and Technology Innovation Project of Shanxi Province(No.2016156);China Postdoctoral Science Foundation(No.2016M590214);Key Research and Development Program of Shanxi Province(No.201603D121002-3);the Natural Science Foundation of Shanxi Province,China(Nos.2015011036,2014011024-6)

摘　　要：A novel design scheme of hot stamping, quenching and partitioning process was conducted in a quenchable boron steel to obtain the nanometric duplex microstructure comprising ultrafine retained austenite and martensite. It is shown that the materials possess excellent mechanical properties and the ductility can be further improved without compromising the strength. The newly treated steel shows excellent mechanical properties and the total elongation of the steel increases from 6.6% to 14.8% compared with that of hot stamped and quenched steel. Therefore, this kind of steel has become another group of advanced high-strength steels. The microstructure which is mainly responsible for such excellent mechanical properties was investigated.A novel design scheme of hot stamping, quenching and partitioning process was conducted in a quenchable boron steel to obtain the nanometric duplex microstructure comprising ultrafine retained austenite and martensite. It is shown that the materials possess excellent mechanical properties and the ductility can be further improved without compromising the strength. The newly treated steel shows excellent mechanical properties and the total elongation of the steel increases from 6.6% to 14.8% compared with that of hot stamped and quenched steel. Therefore, this kind of steel has become another group of advanced high-strength steels. The microstructure which is mainly responsible for such excellent mechanical properties was investigated.

关 键 词：hot stamping quenching and partitioning（Q＆P） retained austenite martensite grain refinement 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG306[金属学及工艺—金属材料] TG161[金属学及工艺—金属学]