Effect of Post-weld Heat Treatment on the Microstructure and Mechanical Properties of 2.25Cr-1Mo-0.25V Ultra-Thick Steel Plate  

作　　者：Yanyang Wu Zongye Ding Wenquan Lu Jingchao Hou Qiaodan Hu Jianguo Li 

机构地区：[1]Shanghai Key Laboratory of Materials Laser Processing and Modification,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai,200240,China [2]State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai,200444,China [3]School of Mechatronic Engineering and Automation,Foshan University,Foshan,528225,Guangdong,China [4]WuYang Iron and Steel,Wugang,450000,Henan,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2024年第6期1104-1114,共11页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China-Outstanding Young Scholars(No.52325407);the National Natural Science Foundation of China(No.51904187);the Open Project of State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy,Shanghai University(SKLASS 2022-06).

摘　　要：Ensuring the homogeneous and excellent mechanical properties of 2.25Cr-1Mo-0.25V ultra-thick steel plate is the key to the production of hydrogenation reactor equipment.Thus,it is required to understand the heterogeneity of microstructures and properties of ultra-thick plate after heat treatment.In this work,the effect of post-weld heat treatment(PWHT)on the strength,plasticity,toughness and microstructures of the 193-mm-thick steel plate was investigated,and the formation mechanism of heterogeneity was elucidated.The PWHT decreased the room-and high-temperature yield strength(YS)and ultimate tensile strength(UTS)of the steel plate after normalizing and tempering(NT),while the room-and high-temperature YS and UTS decreased from the surface to the center of 193-mm-thick steel plate.It was attributed to the enhanced decomposition of martensite-austenite(M-A)constituents and coarsening of grains and precipitated carbides.

关 键 词：Cr-Mo steel Ultra-thick steel plate MICROSTRUCTURE Mechanical properties HETEROGENEITY 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TG156[金属学及工艺—金属材料]