回火对直接淬火A387Gr11CL2钢板组织和性能的影响  

Effect of tempering on microstructure and properties of direct quenched A387Gr11CL2 steel plate

作　　者：赵希庆 王付杰[1] 张丙军 Zhao Xiqing;Wang Fujie;Zhang Bingjun(Department of Mechanical and Electrical Engineering,Yuncheng University,Yuncheng Shanxi 044000,China;Nanjing Iron and Steel Co.,Ltd.,Nanjing Jiangsu 210035,China)

机构地区：[1]运城学院机电工程系,山西运城044000 [2]南京钢铁股份有限公司,江苏南京210035

出　　处：《金属热处理》2024年第7期322-326,共5页Heat Treatment of Metals

基　　金：山西省科技重大专项(202011020003);山西省高校科技创新项目(2021L479)。

摘　　要：在宽厚板生产线进行了A387Gr11CL2钢板直接淬火工艺试验,随后进行了不同工艺的回火试验。结果表明,直接淬火+回火工艺可以获得性能满足ASTM A387/A387M-17标准要求的钢板,最佳回火工艺为750~760℃回火保温100 min。740~750℃回火时,显微组织中板条边界清晰,板条界面上有大量细小的碳化物,760℃回火时,板条边界逐渐融合,碳化物仍然存在,回火温度780℃时,板条合并变宽,碳化物完全消失。模拟焊后热处理之后钢板的强度和硬度小幅下降,断后伸长率略有上升,-30℃冲击吸收能量没有明显变化。Direct quenching process of A387Gr11CL2 steel plate was carried out on the heavy plate production line,followed by tempering experiment at different temperatures.The results show that the direct quenching+tempering process can obtain the steel plate whose properties meet the requirements of the ASTM A387/A387M-17 standard,and the best tempering process is tempering at 750-760℃ for 100 min.When tempered at 740-750℃,the boundaries of the lath in the microstructure are clear,and there are large number of small carbides on the interface of the lath.When tempered at 760℃,the boundaries of the lath gradually disappear,while the carbides still exist.When tempered at 780℃,the laths merge and widen,and the carbides completely disappear.After the simulated post welding heat treatment,the strength and hardness of the tested steel plate decrease slightly,but there is no significant change in the impact absorbed energy at -30℃.

关 键 词：A387Gr11CL2钢板 直接淬火 高温回火 焊后热处理 组织 力学性能 

分 类 号：TG156[金属学及工艺—热处理]