Strengthening Mechanism of a New 700 MPa Hot Rolled High Strength Steel

作     者：YI Hai-long DU Lin-xiu WANG Guo-dong LIU Xiang-hua 

作者机构：State Key Laboratory of Rolling Technology 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：2008年第15卷第2期

页      面：76-80页

核心收录：

学科分类：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）] 

基　　金：Item Sponsored by High Technology Development Program of China(863)(2001AA332020) Project of National Natural Science Foundation of China(50271015) 

主　　题：high strength steel strengthening mechanism dislocation hardening precipitation hardening 

摘      要：The microstructural evolution in a 700 MPa hot rolled high strength steel was analyzed in terms of strengthening *** results show that the hot rolled sheet steel has yield strength of 710 MPa with good elongation and *** strength of the developed 700 MPa hot rolled high strength steel is derived from the cumulative contribution of fine grain size,dislocation hardening and precipitation *** fine grain strengthening and precipitation hardening are the dominant factors responsible for such high strength,and the amount of precipitation hardening is two or four times higher than that of conventional microalloyed hot rolled sheet steels reported in the *** toughness is due to refinement of ferrite grain size.