Cr12MoV钢表面激光熔覆稀土改性铁基复合涂层的性能

采用激光熔覆技术在Cr12MoV钢表面制备CMC PMagic2L涂层,并通过添加稀土氧化物CeO₂构成改性铁基复合涂层,运用光学显微镜、扫描电镜、显微硬度计及摩擦磨损试验机等,研究了稀土氧化物CeO₂的加入对涂层组织性能的影响。结果表明,稀土氧化物CeO₂能够促进熔覆层晶粒细化,使热影响区宽度变大;CeO₂的含量越高,熔覆层硬度越大;含1%CeO₂的改性铁基复合涂层较未添加CeO₂的涂层,尽管热影响区厚度有所增加,但熔覆层平均硬度提高了22.1%,耐磨性也显著提高,磨损体积相对减小了43.66%,且熔覆层组织致密,有效地实现了模具表面强化的目的。

Properties of rare earth modified Fe-based composite coating on Cr12MoV steel surface by laser cladding

CMC PMagic2L coating was prepared on the Cr12MoV steel surface by laser cladding technology, and the modified Fe-base composite coating was formed by adding rare earth oxide CeO₂. The effect of adding rare earth oxide CeO₂ on microstructure and properties of the coating was studied by means of optical microscope, scanning electron microscope, microhardness tester and friction and wear testing machine. The results show that CeO₂ can improve the grain refinement of clad layer and enlarge the width of heat affected zone. The hardness of clad layer increases with the increase of CeO₂ content. Compared with the coating without CeO₂, although the thickness of the heat affected zone increases, but the average hardness of the clad layer in modified Fe-based composite coating with 1%CeO₂ increases by 22.1%, the wear resistance is also significantly improved, and the wear volume is reduced by 43.66%. The clad layer has compact structure, which can effectively achieve the purpose of surface strengthening of the die.