不同制备工艺对镍基合金涂层耐热疲劳性能的影响  

Influence of different preparing processes on thermal fatigue resistance of Ni-based alloy coatings

作　　者：刘栋 李晓娟[1] 刘哲[1] 李秉忠[1] Liu Dong;Li Xiaojuan;Liu Zhe;Li Bingzhong(State Key laboratory of Surface Protection Materials and Application Technology, Wuhan Research Institute of Materials Protection,Wuhan Hubei 430030,China)

机构地区：[1]武汉材料保护研究所特种表面保护及应用技术国家重点实验室,湖北武汉430030

出　　处：《金属热处理》2019年第3期159-166,共8页Heat Treatment of Metals

基　　金：湖北省自然科学基金重点项目(2015CFA161)

摘　　要：采用氧-乙炔火焰重熔、中频感应重熔和等离子堆焊工艺在45钢基体上制备了3种镍基合金涂层,使用热循环法研究了Ni基合金涂层的耐热疲劳性能,并分析了其裂纹的形成及扩展机理。结果表明:热疲劳失效后在镍基合金涂层表面均形成了氧化层,氧-乙炔火焰重熔和中频感应重熔涂层制备过程中残留的气孔能够促进裂纹的萌生和发展,等离子堆焊涂层的热疲劳抗力要优于氧-乙炔火焰重熔和中频感应重熔涂层,其裂纹的形成主要源于氧化层破溃和位错运动共同作用的结果。Three kinds of Ni-based alloy coatings were prepared by FR( flame melting),IFIR( intermediate frequency induction remelting)and PTA( plasma transferred arc) on 45 steel substrate,respectively. The thermal fatigue resistance and the mechanisms of thermal fatiguecrack initiation and extension of the Ni-based alloy coatings was studied via thermal cycling method. The results indicate that the oxide layers are both formed on exposed Ni-based alloy coating surfaces after thermal fatigue failure. The residual mini-pores of coatings prepared by FR and IFIR are propitious to fatigue-crack initiation and extension. Thermal fatigue resistance of PTA coating is superior to FR and IFIR coating,in which thermal fatigue-crack initiation and extension are related to metals oxide layers fracturing and dislocation motion in them.

关 键 词：NI基合金 中频感应重熔 火焰重熔 等离子堆焊 热疲劳抗力 

分 类 号：TG174.442[金属学及工艺—金属表面处理]