Effects of Processing Variables on Microstructure and Yield Ratio of High Strength Constructional Steels

作     者：Jian KANG Cheng-ning LI Xiao-lei LI Jin-hua ZHAO Guo YUAN Guo-dong WANG 无

作者机构：State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 Liaoning China Shougang Qian'an Iron and Steel Co. Ltd. Qian'an 064404 Hebei China 

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

年 卷 期：2016年第23卷第8期

页      面：815-821页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 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] 080201[工学-机械制造及其自动化] 

基　　金：Item Sponsored by National Natural Science Foundation of China(51504063) 

主　　题：relaxation tensile martensite rolling steels refinement ferrite austenite creative finish 

摘      要：The process of“controlled rolling＋relaxation＋ultra fast cooling（UFC）for high strength constructional steel with low yield ratio was *** and corresponding relationship with low yield ratio were *** results showed that the constructional steels with multiphase microstructure of bainitic ferrite,martensite-austenite（M-A）and lath bainite were obtained through the creative *** grain size decreased with the decrease in finish rolling temperature,which enhanced the strength by the grain refinement *** proper relaxation treatment promoted the bainitic ferrite lath width and the formation of blocky M-A *** addition,both the tensile and yield strength increased with the decrease in finish rolling temperature and UFC final temperature,but the yield strength increased more significantly than tensile strength,which caused the increase in yield *** using the process of“controlled rolling＋relaxation＋ultra fast cooling,the excellent comprehensive mechanical properties of 780 MPa grade constructional steels of 12-40 mm in thickness were achieved.