Development of Ti-Microalloyed 600 MPa Hot Rolled High Strength Steel

作     者：YI Hai-long LIU Zhen-yu WANG Guo-dong WU Di 

作者机构：State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China 

出 版 物：《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)

年 卷 期：2010年第17卷第12期

页      面：54-58,64页

核心收录：

学科分类：082304[工学-载运工具运用工程] 08[工学] 080204[工学-车辆工程] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0823[工学-交通运输工程] 

基　　金：Item Sponsored by High Technology Development Program of China(2003AA33G010) Central Collegiate Basic Scientific Bursary of China(N090307001) 

主　　题：hot rolled high strength steel TMCP (thermomechanical control process) precipitate carbide 

摘      要：A high strength steel with yield strength on the order of 600 MPa was developed successfully with only addition of titanium alloying element based on a low-carbon steel. The results showed that the hot deformation accelerated ferrite and pearlite transformation and retarded bainite transformation under continuous cooling condition. The microstructure of this steel was mainly composed of fine grained ferrite and carbides distributing along the ferrite grain boundaries. The yield and tensile strengths of steels were about 620--650 MPa and 720--740 MPa, respectively, and the values of strain hardening exponent and plastic strain ratio were 0.12 and 0.80, respectively, thereby providing a good combination of strength with toughness. In short, the fine grained ferrite and TiC precipitation strengthening contributed to a high strength.