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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+M_(23)C_6增加,初生碳化物M_(23)C_6较少。当SiC含量的增加至7%时,涂层中的显微组织主要为M_(23)C_6,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 laser cladding method was used to prepare high hardness and high wear resistance coatings on the substrate of die steel. The microstructure and properties of the coating were studied by means of optical microscope, macroscopic hardness tester and wet sand abrasion tester. The results show that when the content of SiC is 0% ~ 3.5%, the content of austenite decreases and the content of α-Fe + M_ (23) C_6 increases and the amount of primary carbides M_ (23) C_6 increases. When SiC content increases to 7%, the microstructure in the coating is mainly M_ (23) C_6, and evenly distributed in the coating. With the SiC content increased to 10.5%, the organization was significantly refined. In addition, with the increase of SiC content, the coating hardness and wear resistance first increased and then decreased. When the SiC content of 7%, its wear resistance to achieve the best.