扫描路径对热丝激光修复K4169镍基高温合金显微组织的影响  

Effect of Scanning Path on Microorganization of Hot Wire Laser Repair K4169 Nickel-based Superalloy

作　　者：康国荣 石玗[1] 李春凯[1] 顾玉芬[1] KANG Guorong;SHI Yu;LI Chunkai;GU Yufen(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou 730050,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《电焊机》2025年第2期70-76,共7页Electric Welding Machine

基　　金：国家自然科学基金(52365048);甘肃省科技重大专项(22ZD6GA008)。

摘　　要：采用金相、XRD、SEM、EBSD等检测手段研究非连续纵向与连续横向两种扫描路径对热丝激光修复K4169镍基高温合金显微组织的影响。结果表明:(1)两种扫描路径下修复区显微组织都以柱状树枝晶和少量等轴晶为主,但非连续纵向扫描路径下修复区各位置晶体尺寸均较小;(2)相组成都是γ-Ni基体相且都析出了有害相Laves相,但非连续纵向扫描路径下析出的Laves相的尺寸小、含量少;(3)非连续纵向扫描路径下的二次枝晶间距、晶粒平均尺寸更小,但该扫描路径下修复区小角度晶界含量高,会造成材料的塑性和韧性较差。The effects of discontinuous longitudinal and continuous transverse scanning paths on the microstructure of K4169 nickel-based superalloy repaired by hot wire laser were investigated by means of metallographic,XRD,SEM and EBSD.The results show that:(1)The microstructure of the repair zone under the two scanning paths is dominated by columnar dendrites and a small amount of equiaxed crystals,but the crystal size at each position of the repair zone under the discontinuous longitudinal scanning path is small.(2)The phase composition is γ-Ni matrix phase and the harmful phase Laves phase is precipitated,but the size of Laves phase is small and the content is small under the discontinuous longitudinal scanning path.(3)The secondary dendrite spacing and the average grain size are smaller under the discontinuous longitudinal scanning path,but the content of small angle grain boundaries in the repair zone is higher under this scanning path,which will cause poor plasticity and toughness of the material.

关 键 词：扫描路径 晶粒尺寸 二次枝晶间距 晶界角度 LAVES相 

分 类 号：TG456.7[金属学及工艺—焊接]