热处理对激光熔覆Ni合金层的组织及冲蚀磨损性能的影响  

Effect of Heat Treatment on Microstructure and \=Erosion Wear Properties of Laser Cladded Ni Alloy Coating

作　　者：张大伟[1] 郝文森[1] 段慧玲[1] 欧阳家虎[2] 雷廷权[2] 

机构地区：[1]大庆石油学院机械系 [2]哈尔滨工业大学材料学院

出　　处：《金属热处理学报》1999年第1期40-47,共8页

基　　金：中国石油天然气总公司科技中青年创新基金

摘　　要：借助于扫描电镜、Ｘ射线衍射仪、能谱仪和显微硬度计研究了２Ｃｒ１３不锈钢激光熔覆Ｎｉ基合金及后续热处理前后的组织结构、显微硬度和耐冲蚀磨损性能。结果表明，Ｎｉ基合金激光熔覆层的显微硬度高达５００～７００ＨＶ，而后继热处理又进一步使熔覆层硬度提高到８５０～１１２０ＨＶ。在含有Ｈ２ＳＯ４和ＮａＣｌ的砂浆水溶液中冲击速度７ｍ·ｓ－１、冲击角４５°的条件下激光熔覆Ｎｉ基合金并经处理后可使冲蚀磨损率下降约９０％。热处理使熔覆层的硬度和韧度增加。组织细化以及γＮｉ基体中沉淀析出Ｆｅ４．５Ｎｉ１８．The microstructure, microhardness and erosion resistance of laser surface cladded Ni alloy with and without following heat treatment on a 2Cr13 stainless steel were investigated by means of scanning electron microscopy (SEM), X ray diffraction (XRD), energy dispersive X ray analysis (EDX), microhardness testing. Test results showed that,microhardness of 500700HV of the cladded Ni\|base alloy layer could be obtained and the following heat treatment further increased the hardness to 8501120HV. Under the condition of water solution with quartz sand slurry containing H\-2SO\-4 and NaCl, 7ms-1 impact velocity, and 45 impact angle, the laser\|clad Ni\|base alloy layer with following heat treatment can reduce the erosion rate by about 90%, and the heat treatment increase the hardness and ductility of coating. It is suggested that the marked improvement in erosion resistance is closely related to the fine microstructure, and Fe4.5Ni18.5B\-6 compound precipitated in Ni matrix by heat treamtment.\=\=

关 键 词：激光熔覆 热处理 不锈钢 冲蚀磨损 镍基合金 

分 类 号：TG161.99[金属学及工艺—热处理] TG142.71[金属学及工艺—金属学]