沉淀强化镍基高温合金熔化焊液化裂纹研究进展  

Research progress on liquation cracking of precipitation hardened nickel-based superallloys in fusion welding

作　　者：张秉刚[1] 彭飞[1] 王厚勤[1] 韩柯[1] Zhang Binggang;Peng Fei;Wang Houqin;Han Ke(Harbin Institute of Technology,State Key Laboratory of Advanced Welding and Joining,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学,先进焊接与连接国家重点实验室

出　　处：《焊接》2019年第9期26-31,I0021,共7页Welding & Joining

基　　金：黑龙江省自然科学基金(E2018027);先进焊接与连接国家重点实验室开放基金(AWJ-19Q05)

摘　　要：沉淀强化镍基高温合金由于具有优异的高温强度和耐热腐蚀性而被广泛应用于航空发动机和工业燃气轮机的热端部件。但是这类合金在焊接过程中具有较高的液化裂纹敏感性,影响部件的使用寿命和性能。系统地阐述了沉淀强化镍基高温合金熔化焊液化裂纹的形成机理,介绍了几种控制液化裂纹的方法,包括增大焊接热输入、焊前预热、焊前热处理和添加中间层,最后指出了今后的主要研究方向。Precipitation hardened nickel-based superalloys are widely used in aero and industrial gas turbine engines due to their excellent high temperature strength and hot corrosion resistance.However,the components’life and performance will be affected because of its high liquation cracking susceptibility during weldin g.The formation mechanism of liquation cracking of precipitation hardened nickel-based superallloys in fusion welding is introduced systematically.Several methods for controlling liquation cracking are introduced,including increasing heat input,pre-weld preheating,pre-weld heat treatment and adding filler alloys.At last,the main future research directions are pointed out.

关 键 词：沉淀强化镍基高温合金 液化裂纹 开裂机理 裂纹控制 

分 类 号：TG40[金属学及工艺—焊接]