镍基焊丝氩弧焊K438合金接头组织与性能研究  

Study on Microstructure and Properties of K438 Alloy TIG Welding Joint

作　　者：刘保侠 王红顺 庞义斌 王鑫 黄兆亮 王艳 张峰 张继华 LIU Baoxia;WANG Hongshun;PANG Yibin;WANG Xin;HUANG Zhaoliang;WANG Yan;ZHANG Feng;ZHANG Jihua(PipeChina North Pipeline Company Compressor-Set Maintenance Repair&Overhaul Center,Langfang 065000,China;HFYC(Zhenjiang)Additive Manufacturing Co.,Ltd.,Zhenjiang 212132,China)

机构地区：[1]国家管网集团北方管道有限责任公司压缩机组维检修中心,河北廊坊065000 [2]航发优材(镇江)增材制造有限公司,江苏镇江212000

出　　处：《电焊机》2024年第3期152-157,共6页Electric Welding Machine

摘　　要：针对某型燃气轮机动力涡轮转子叶片磨损失效要求,通过钨极氩弧焊制备了无裂纹的K438接头,分析了K438接头的显微组织和力学性能。结果表明,接头成形美观、无裂纹,堆焊区组织中γ基固溶体上弥散分布着富Cr的柱状、颗粒状、树状等形态各异的M_(23)C_(6)和M_(6)C白色相,结合线硬度达452 HV0.5,堆焊区硬度约278 HV0.5,接头平均抗拉强度403.3 MPa,接头断裂于堆焊区,断裂形式为脆性和韧性混合断裂。Aiming at the wear and failure requirements of a certain type of gas turbine power turbine rotor blade,a crackfree K438 joint was prepared by TIG welding,and the microstructure and mechanical properties of the K438 joint were analyzed.The results show that the joints are beautifully formed and have no defects such as cracks.Theγ-based solid solution in the surfacing area is dispersed with Cr-rich M_(23)C_(6) and M_(6)C white phases such as columnar,granular and dendritic phases.Furthermore,the bonding line hardness is as high as 452 HV0.5,the hardness of the surfacing area is about 278 HV0.5.In addition,the average tensile strength of the joint is 403.3 MPa,and it is fractured in the surfacing area in the mode of brittle and ductile fracture.

关 键 词：K438合金 钨极氩弧焊 显微组织 力学性能 

分 类 号：TG455[金属学及工艺—焊接]