激光重熔功率对镍基高温合金熔覆层组织性能的影响  

Effect of laser remelting power on microstructure and properties of Ni-based superalloy cladding coating

作　　者：黄添 舒林森[1,2] 陈向东 卢进军 HUANG Tian;SHU Lin-sen;CHEN Xiang-dong;LU Jin-jun(School of Mechanical Engineering,Shaanxi University of Technology,Hanzhong 723001,China;Shaanxi Key Laboratory of Industrial Automation,Hanzhong 723001,China;Aviation industry Shaanxi Aircraft Industry Co Ltd,Hanzhong 723001,China;School of Physics and Telecommunication Engineering,Shaanxi University of Technology,Hanzhong 723001,China)

机构地区：[1]陕西理工大学机械工程学院,陕西汉中723001 [2]陕西省工业自动化重点实验室,陕西汉中723001 [3]航空工业陕西飞机工业有限公司,陕西汉中723001 [4]陕西理工大学物理与电信工程学院,陕西汉中723001

出　　处：《材料热处理学报》2024年第11期198-206,共9页Transactions of Materials and Heat Treatment

基　　金：陕西省重点研发计划(S2022-YF-YBGY-0437);陕西省秦创原“科学家+工程师”团队建设项目(2023KXJ-123)。

摘　　要：为了解决镍基高温合金涂层“强度有余,韧性不足”的问题,采用激光重熔工艺处理激光熔覆Inconel718合金涂层,研究重熔功率对涂层表面形貌、物相组成、显微组织和拉伸性能的影响。结果表明:重熔后的熔覆层表面粉末附着减少,表面形貌得到明显改善;激光重熔后熔覆层的组织仍是由γ-(Ni,Fe,Cr)和γ″-Ni_(3)Fe双相组成,随着激光重熔功率的增大,组织中γ″-Ni_(3)Fe相的体积分数先增加后减少,且涂层顶部和中部组织的晶粒尺寸先减小后增大;经重熔后涂层的拉伸强度和屈服强度略有降低,但伸长率获得显著提升,重熔功率为1200、1350和1500 W时分别提高了47.4%、52.6%和48.7%;重熔功率为1350 W时试样断口中韧窝分布均匀,此功率重熔处理的涂层韧性最好。激光重熔工艺可以有效地提高熔覆层的力学性能。In order to solve the problem of“excessive strength and insufficient toughness”in nickel-based superalloy coatings,laser remelting technology was used to treat the laser cladding Inconel718 alloy coating.The effect of laser remelting power on surface morphology,phase composition,microstructure and tensile properties of the coatings was studied.The results show that the amount of powder adhering to the surface of the remelted cladding coatings is reduced,and the surface morphology is significantly improved.The microstructure of the cladding coatings after laser remelting is still composed ofγ-(Ni,Fe,Cr)andγ″-Ni_(3)Fe dual phase.As the laser remelting power increases,the volume fraction of theγ″-Ni_(3)Fe phase in the microstructure first increases and then decreases,and the grain size of the top and middle structures of the coatings first decreases and then increases.After remelting,the tensile strength and yield strength of the coatings slightly decrease,but the elongation is significantly improved.When the remelting power is 1200,1350 and 1500 W,the elongation increases by 47.4%,52.6%and 48.7%,respectively.When the remelting power is 1350 W,the distribution of dimples in the fracture surface of the sample is uniform,and the coating with remelting treatment has the best toughness.Laser remelting technology can effectively improve the mechanical properties of the cladding coatings.

关 键 词：激光熔覆 激光重熔 高温合金 显微组织 力学性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]