摘要
采用CO2激光器在GH4169高温合金表面激光熔覆Ni60镍基合金。借助扫描电镜(SEM)、X射线衍射仪(XRD)、能谱仪(EDS)、显微硬度计、ML-100型磨粒磨损试验机对熔覆组织结构、物相、组成成分、硬度及耐磨性能进行了分析。结果表明,熔覆层组织由γ-Ni、CrB、Fe3C、Cr7C3、Cr23C6等相组成,熔覆层中存在着颗粒强化、细晶强化和固溶强化等强化作用,显著提高了熔覆层的硬度和耐磨性能,熔覆层的硬度是基体硬度的3倍。GH4169合金的磨损机制为磨粒磨损和粘着磨损,激光熔覆层的磨损机制为磨粒磨损。
The laser coating of Ni60 alloy coating on GH4169 surperalloy was achieved by a great power CO2 laser.The microstructure,phase constitution,micro-hardness,wear resistance of Ni60/GH4169 composite coating were examined by SEM,XRD,EDS,micro-hardness tester and ML-100 abrasion tester.The results reveal that the microstructure of laser cladding is composited of γ-Ni、CrB、Fe3C、Cr7C3、Cr23C6 and so on.The hardness and wear resistance were improved extremely due to the precipitation strengthening,fine-grain strengthening and solidsolution strengthening.The hardness of coating is 3 times than that of matrix.GH4169 was investigated the wear mechanism of abrasive wear and adhesive wear and wear mechanism of laser cladding layer of abrasive wear.
出处
《应用激光》
CSCD
北大核心
2015年第3期295-299,共5页
Applied Laser
基金
2013年九江学院校级科研资助项目(项目编号:2013ZD07)
