TiC 含量对激光熔覆 TiC 增强双相不锈钢复合涂层性能的影响

采用激光熔覆技术在 40CrNiMo 基材上制备了 TiC 增强双相不锈钢复合熔覆层，熔覆层物相主要由奥氏体、马氏体、M7C3型碳化物和 TiC 组成。其中 M7C3型碳化物主要包括 Fe7C3 、Cr7C3 或者 (Fe、Cr)7C3三种，TiC 按尺寸可分为熔解后析出的微米级 TiC 以及粗大的未熔 TiC 颗粒。析出的 TiC 颗粒为方块状，随着 TiC 添加量增加，呈花瓣状长大。未熔 TiC 颗粒与基材形成了扩散界面，具有很好的界面结合性。当加入 30 wt.% TiC 时，熔覆层具有最好的耐磨性，硬度可达 55.26 HRC，磨损体积为 2.54×10-2mm3 ，耐磨性是基材的 3.37 倍。

Effect of TiC Content on Properties of Laser Cladding TiC Reinforced Duplex Stainless Steel Composite Coating

TiC reinforced Duplex stainless steel composite coating was prepared on 40 CrNiMo matrix by laser cladding technology. The phase composition of the coating mainly includes austenite, martensite, M7C3 carbides and TiC. Among them, M7C3 type carbides mainly contain Fe7C3 , Cr7 C3 or (Fe, Cr)7C3 , TiC includes micron level TiC precipitated after melting and coarse unmelted TiC particles. The precipitated TiC particles were square-shaped and grew petal-like with the increase of TiC addition. The unmelted TiC particles form a diffusion interface with the substrate, and have good interface bonding. When adding 30 wt.%TiC, the cladding layer has the best wear resistance, its hardness can reach 55.26 HRC, wear volume is 2.54×10-2 mm3 , wear resistance is 3.37 times that of substrate.