【摘要】 采用激光技术在有送粉器的2kW CO₂激光器上,对基体表面熔覆一层高温耐磨合金。用扫描电子显微镜、电子探针和X射线衍射技术分别进行熔覆层的组织形貌观察、显微成分分析和物相的鉴定。结果表明,熔覆层显微组织主要有许多弥散分布的W₂C、（W,Ti）C_1-x、WC质点和片状共晶态的M₁₂C及γ（f.c.c）母体相。室温及高温硬度测试结果表明,熔覆层具有适中的室温硬度（520HV0.2）和相对高的高温硬度。更多还原

【Abstract】 A laser—cladding technique was used to produce alloy coating with high temperature—wear resistance on the surface of substrate. A 2kW CO₂ laser with powder feeder was used for the cladding process. A scanning electron microscope （SEM） equipped with an energy dispersive X-ray microanalysis system was employed for analysing the microstructure and microchemical. X-ray diffraction technique had been applied to characterize the phases formed during cladding process. The results show that the microstructure of cladding alloy mainly consists of many dispersed particles (W₂C, （W,Ti）C_1-x,WC), lamellar eutectic’M₁₂C and γ（f. c. c） matrix. Hardness at room and high temperature which was tested show that cladding zone has a moderate room temperature hardness and relatively higher high temperature hardness.更多还原