激光焊接及热处理对聚变堆用CLF-1钢微观组织影响的研究  

Effect of laser welding and heat treatment on the microstructure of CLF-1 steel for fusion reactor

作　　者：缑俊 王平怀[1] 朱小波 胡丹 邱嵘 谌继明[1] 沈静 王长浩 曾闻雨 GOU Jun;WANG Pinghuai;ZHU Xiaobo;HU Dan;QIU Rong;CHEN Jiming;SHEN Jing;WANG Changhao;ZENG Wenyu(Southwestern Institute of Physics,Chengdu 610041,China;College of Material Science and Engineering,Chongqing University of Technology,Chongqing 400054,China)

机构地区：[1]核工业西南物理研究院,成都610041 [2]重庆理工大学材料科学与工程学院,重庆400054

出　　处：《重庆理工大学学报（自然科学）》2023年第9期150-157,共8页Journal of Chongqing University of Technology：Natural Science

基　　金：四川省科技计划重点研发项目(2018JZ0070)。

摘　　要：采用已优化激光焊接工艺对6 mm厚CLF-1钢进行拼焊并进行焊后回火热处理,使用电子通道衬度和电子背散射衍射等方法对样品性能进行表征,研究了CLF-1钢的焊态、回火态微观组织结构演变。结果表明:焊态焊缝区域为α′-Fe单相位错马氏体组织,相变马氏体遵循KS取向关系与NW取向关系;热处理后M 23 C 6相在马氏体变体内部和界面处析出,有效降低了马氏体变体内部的取向差,但未对马氏体变体位相产生明显影响。显微硬度测试结果表明CLF-1钢焊缝区域显微硬度为358HV 0.2;焊后热处理将焊缝的显微硬度降至约258HV 0.2,实现了良好的去应力指标。The optimized laser welding process was used to weld the 6mm thick CLF-1 steel and subsequent weld tempering heat treatment.The sample were characterized by electron channel contrast and electron backscatter diffraction,and the microstructure evolution of as-weld and tempered CLF-1 steel was studied.The results show that as-weld area mainly consist ofα′-Fe single phase dislocation martensite structure,transformation martensite follows KS and NW orientation relationship;After post weld heat treatment,M 23 C 6 phase precipitated in the interior and interface of martensite variant respectively.Post weld heat treatment can effectively reduced the orientation difference in the interior of martensite variant,but it have little effect on the martensite phase.The microhardness test results show that the microhardness of the as-weld area of CLF-1 steel is 358HV 0.2 and the microhardness of the weld significantly reduce to 258HV 0.2 after post weld heat treatment.At last,a good stress removal index can be obtained by tempering treatment.

关 键 词：CLF-1钢 激光焊接 马氏体变体 取向差 

分 类 号：TG456.7[金属学及工艺—焊接]