核聚变用CLF-1钢真空激光焊接  

Vacuum laser welding of CLF-1 steel for nuclear fusion

作　　者：张国瑜 徐诺 徐国建[1] 李午红 邱晓杰 ZHANG Guoyu;XU Nuo;XU Guojian;LI Wuhong;QIU Xiaojie(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;Center for Teacher Development and Educational Evaluation,Shenyang University of Technology,Shenyang 110870,China;Research Institute of Raycham,Nanjing Zhongke Raycham Laser Technology Co.Ltd.,Nanjing 210038,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]沈阳工业大学教师发展与教育评估中心,沈阳110870 [3]南京中科煜宸激光技术有限公司煜宸研究院,南京210038

出　　处：《沈阳工业大学学报》2023年第5期527-533,共7页Journal of Shenyang University of Technology

基　　金：广东省重点研发计划项目(2018B090905003);沈阳市科技计划项目(20-202-1-10).

摘　　要：针对核聚变用CLF-1钢的焊接问题,采用真空激光焊(VLW)技术研究了VLW焊接特性、焊缝的显微组织和力学性能.结果表明:随着真空度的降低,金属蒸气羽烟得到了良好抑制,焊缝金属氧化程度降低;相比常压激光焊接(ALW),热输入约降低了20%,VLW焊缝晶粒尺寸明显减小,富Cr、Fe、W和C的椭圆状碳化物(M_(23)C_(6))及富Ta或V的高密度球状碳化物(MX)尺寸有所减小,起到了良好的弥散强化效果,且焊缝组织中无残余铁素体(δ-Fe)存在;VLW焊缝经高温回火(PWHT)后的冲击韧性为280 J,高出母材43 J,约为ALW焊缝冲击韧性的2.4倍,冲击试样断口为韧性断裂.Aiming at the welding problem of CLF-1 steel for nuclear fusion,the vacuum laser welding(VLW)technology was used.The welding characteristics,microstructure and mechanical properties of VLW welds were studied.The results show that the metal vapour plume(MVP)gets well inhibited and the oxidation degree in weld metal(WM)decreases,with the reduce of vacuum degree.Compared with atmospheric laser welding(ALW),the heat input reduces by 20%approximately,the grain size of VLW weld decreases dramatically,whereas the sizes of M_(23)C_(6)(elliptic carbides rich in Cr,Fe,W and C)and MX(high-density spheroidal carbides rich in Ta or V)reduce to some degrees,resulting in favourable dispersion strengthening effect.There is no residual ferrite(δ-Fe)in the weld microstructure.The impact toughness of VLW weld after high temperature tempering(PWHT)is 280 J,which is 43 J higher than that of base metal and 2.4 times as that of ALW weld.The fractograph of impact sample is ductile fracture.

关 键 词：CLF-1钢 真空激光焊接 常压激光焊接 金属蒸气羽烟 热输入 显微组织 MX碳化物 冲击韧性 

分 类 号：TG456.7[金属学及工艺—焊接]