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采用氩弧熔覆技术在45号钢表面制备一层稀土WC颗粒增强铁基体耐磨复合涂层。通过扫描电镜(SEM)、X射线衍射(XRD)和能谱仪(EDS)等测试分析手段研究了稀土的引入对复合涂层中基体组织及碳化物的影响,并与未加稀土进行了比较。结果表明:引入稀土后,一方面优化了熔覆层组织中碳化物颗粒分布,降低了熔覆层组织中碳化物颗粒的团聚、桥接,且颗粒分布均匀;另一方面改善了熔覆层的组织,细化晶粒,减弱了熔覆过程中产生的树状晶,抑制了WC颗粒的溶解和鱼骨状碳化物的生成。在熔覆层组织中碳化物颗粒相主要有三种存在形式:原始未熔WC颗粒、与基体形成的复式碳化物及在凝固过程中重新结晶的W2C(或WC)。
Using argon arc cladding technology in the 45 steel surface prepared a layer of rare earth WC particles reinforced iron matrix wear-resistant composite coating. The effects of rare earth on the microstructure and carbides in the composite coating were investigated by means of SEM, XRD and EDS. The results were compared with those of non-added rare earth . The results show that after the introduction of rare earth, on the one hand, the distribution of carbide particles in the cladding layer is optimized and the agglomeration and bridging of the carbide particles in the cladding layer are reduced, and the distribution of the particles is even. On the other hand, Tissue, grain refinement, weakened the dendrite produced during the cladding, inhibited the dissolution of WC particles and fish bone carbide formation. There are mainly three forms of carbide particle phase in the cladding layer: the original unmelted WC particles, the complex carbides formed with the matrix and the recrystallized W2C (or WC) during solidification.