Effect of Heat Input on Cleavage Crack Initiation of Simulated Coarse Grain Heat-affected Zone in Microalloyed Offshore Platform Steel

作     者：Feng LU Guang-ping CHENG Feng CHAI Tao PAN Zhong-ran SHI Hang SU Cai-fu YANG 

作者机构：School of Material Science and EngineeringAnhui University of Technology Department of Structural SteelCentral Iron and Steel Research Institute 

出 版 物：《Journal of Iron and Steel Research International》 (J. Iron Steel Res. Int.)

年 卷 期：2016年第23卷第10期

页      面：1086-1095页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 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 Vanitec-CISRI Vanadium Technology Center 

主　　题：simulated coarse-grained heat-affected zone martensite-austenite constituent pearlite colony cleavage fracture V-N-Ti microaltoying 

摘      要：The combined effects of martensite-austenite（MA）constituent and pearlite colony on cleavage crack initiation in the simulated coarse-grained heat-affected zone（CGHAZ）of V-N-Ti microalloyed offshore platform steel under different heat inputs were *** results of welding simulation,instrumented impact test,and quantitative analysis indicated that the size of the MA constituent decreased with the increase in cooling time,and by contrast,the size of the pearlite colony *** to Griffith theory,the critical sizes of cleavage microcracks were *** the increase of cooling time,the calculated microcrack size could be characterized by the size of the MA constituent first,and then fitted with the size of the pearlite ***,the calculated microcrack size variation was opposite to the microcrack initiation *** phenomenon is probably due to the combined effects of the MA constituent and pearlite colony with increasing the cooling time of the specimen′s temperature from800 to 500 ℃.