钴基焊丝氩弧焊K438合金接头组织与性能研究  

Study on Microstructure and Properties of K438 Alloy Joint by Argon Arc Welding with Co Based Wire

作　　者：王艳 庞义斌 黄兆亮 王红顺 张峰 张继华 WANG Yan;PANG Yibin;HUANG Zhaoliang;WANG Hongshun;ZHANG Feng;ZHANG Jihua(Compressor-Set Maintenance Repair&Overhaul Center of PipeChina North Pipeline Company,Langfang 065000,China;HFYC(Zhenjiang)Additive Manufacturing Co.,Ltd.,Zhenjiang 212000,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：《热加工工艺》2024年第19期35-38,43,共5页Hot Working Technology

摘　　要：针对某型燃气轮机动力涡轮转子叶片的磨损修复要求,采用与K438铸造镍基高温合金热物理性质匹配、相容性良好的钴基焊丝为堆焊材料,开展氩弧焊工艺研究,通过改变预热温度、堆焊轨迹来探究解决高Al、Ti高温合金熔焊时开裂的新方法。研究表明,预热与垂直于焊接方向前后摆动组合的工艺可制备无裂纹的对接接头。制备的无裂纹接头表面成形良好,堆焊区与基材冶金结合良好,钴基基体组织上弥散分布着富Cr的条状M_(2)3C_(6)、花瓣状的W元素固溶强化产物、富Cr的异形M_(6)C等形态各异的相。此外,接头热影响区出现了硬化现象,硬度最高值可达462 HV0.5,堆焊区硬度约263 HV0.5,接头平均抗拉强度472 MPa,为母材的53%。Aiming at repair requirements for wear of a gas turbine power turbine rotor blade,using Co based welding wire as the surfacing material,which matches with the thermophysical properties of the K438 cast nickel-based superalloy and has good compatibility,the argon arc welding process study was carried out to explore a new method to solve the cracking of high Al and Ti superalloys during fusion welding by changing preheating temperature and surfacing trajectory.The studies show that a combination of preheating and back and forth swinging perpendicular to the welding direction can produce crack-free butt joints.The surface of the prepared crack-free joints is well formed,the welding area and the substrate are well metallurgically combined,and Cr-rich strip M_(23)C_(6),petal-shaped W element solid solution strengthening products and Cr-rich special-shaped M_(6)C phases with different shapes are dispersively distributed in the Co based matrix.In addition,the heat-affected zone of the joint has a hardening phenomenon,the highest hardness can reach 462 HV0.5,the hardness of the welding zone is about 263 HV0.5,and the average tensile strength of the joint is 472 MPa,which is 53%of the substrate.

关 键 词：钨极氩弧焊 K438高温合金 组织 力学性能 

分 类 号：TG444.74[金属学及工艺—焊接]