镍基高温合金K403的脉冲激光熔覆涂层应用研究  

Application Study of Laser Cladding on K403 Ni-based Superalloy

作　　者：陈长军[1] 曹琴[1] 费群星[2] 张敏[1] 徐星[1] 

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室激光加工中心,湖北武汉430081 [2]北京航空制造工程研究所高能束流国防科技重点实验室,北京100024

出　　处：《应用激光》2011年第1期26-33,共8页Applied Laser

基　　金：高能束流国防科技重点实验室基金资助项目(项目编号2009320)

摘　　要：为了对现服役的的K403高温合金渗铝叶片的失效区进行性能恢复,采用YAG固体脉冲多功能激光加工器在涡轮叶片K403基体上进行了激光熔覆实验,研究热处理对基体显微组织和对熔覆层的影响,不同激光熔覆参数(电流、脉宽、频率)条件下寻求适合对K403进行激光熔覆修复的粉末,熔覆之后显微组织和性能以及显微硬度的变化。实验采用金相显微镜、扫描电子显微镜对微观组织加以分析,用显微硬度计进行试样的硬度检测。结果表明:基体经过热处理其组织出现了细小析出物,适合对K403进行激光熔覆的粉末为WKD-1、WKD-11、WKD-2、WKD-22。熔覆时裂纹大多由基体一侧延伸到熔覆层中,最佳熔覆工艺参数为电流100A、脉宽8.0ms、频率12Hz,没有明显的裂纹和气孔,显微硬度可明显提高到Hv528。In order to repair the failured aluminized K403 superalloy blade, laser cladding was performed on K403 substrate by YAG muti- function pulsed laser. The effect of heat treatment on substrate microstructure and the cladding layer was investigated. To find out the optimal repair powder under different laser cladding parameters such as current, pulse width, frequency and the corresponding microstructure and microhardness. The microstructure after heat treatment demonstrated fine precipitates. The better laser cladding powder was WKD-1 WKD-11, WKD-2, WKD-22.The crack extended from the substrate to the cladding layer. The best cladding parameter-is 100A, 8.0ms and 12Hz. Under this parameter, there was no obvious crack and pore. The microhardness can be amounted to Hv528.

关 键 词：高温合金 K403 激光熔覆 

分 类 号：TG146.15[一般工业技术—材料科学与工程]