摘要
采用激光熔覆方法在模具钢基体上制备高硬度高耐磨性涂层,同时借助光学显微镜、宏观硬度计以及湿砂橡胶轮式磨损试验机等对该涂层组织与性能进行研究。结果表明当SiC含量为0%~3.5%时,奥氏体含量逐渐减少,共晶组织α-Fe＋M23C6增加,初生碳化物M23C6较少。当SiC含量的增加至7%时,涂层中的显微组织主要为M23C6,且均匀分布于涂层中。随SiC含量增加到10.5%时,组织明显细化。此外,随SiC含量的增加,涂层硬度与耐磨性呈先增加后减小的变化规律。当SiC含量为7%时,其耐磨性达到最佳。
The coating with high strength, high hardness and high wear resistance was prepared on mold steel substrate by laser cladding method. The microstructure and properties of the coating were investigated through OM, hardness tester and wet sand rubber wheel abrasive tester. The results show that： when SiC content is in range of 0% to 3.5wt%, the content of austenite gradually reduces while the content of eutectic structure a-Fe＋M23C6 increases. Few carbide M23C6 is found. When the content of SiC is 7%, the microstructure is mainly M23C6, which distributes uniformly in the coating. When the content of SiC is 10.5%, the microstructure is apparently refined. With increasing SiC content, the hardness and wear resistance of the coating firstly increase, then decrease. When the content of SiC is 7%, the wear resistance is best.
出处
《热加工工艺》
CSCD
北大核心
2016年第6期180-182,共3页
Hot Working Technology
基金
湖南省科技厅资助项目(2014GK3052)
关键词
汽车模具
显微组织
耐磨性
激光熔覆
automobile mold
microstructure
wear resistance
laser cladding
