稀土氧化铈对高速钢梯度涂层组织性能的研究

Study on Microstructure and Properties of Rare Earth Cerium Oxide on High Speed Steel Ladder Coating

采用高速钢的材料作为工作层,在工作层成分基础上通过降低主要元素含量作为过渡层.利用氩弧熔覆的方法将材料熔覆到45号钢的基体上,在工作层中添加0~0.2%的稀土氧化铈,结果表明,添加一定量的稀土可以细化晶粒,提高其硬度、耐磨性.0.1%的稀土含量最优,其表面硬度可达62.2 HRC,相对耐磨性较无稀土可提高20%.利用Marc软件对过渡层熔覆过程进行模拟,模拟得到的应力值与实测应力值变化趋势拟合较好,纯工作层成分的熔覆层残余应力最高,增加过渡层后可大幅降低残余应力,实测工作层横向应力为812 MPa,确定M2梯度层成分最优.

The material similar to high-speed steel was used as working layer,and the main element content was reduced as transition layer on the basis of working layer composition.Argon arc cladding was used to clad the material onto the substrate 45 and 0~0.2%rare earth cerium oxide was added into the working layer.Argon arc cladding was used to clad the material onto the substrate 45 and 0~0.2%rare earth cerium oxide was added into the working layer.The surface hardness of 0.1%RE is 62.2 HRC,and its relative wear resistance is 20%higher than that without RE.Marc software is used to simulate the cladding process of the transition layer.The simulated stress value is in good agreement with the measured stress value.The residual stress of the cladding layer with pure working layer is the highest.The residual stress can be greatly reduced by increasing the transition layer.The measured working layer is 812 MPa horizontally,and the gradient layer M2 has the best composition.