Ce2O3对激光熔覆Fe-Cr-W-V梯度涂层组织性能的影响与有限元分析

Effect of Ce2O3 on Microstructure and Properties of Laser Cladding Fe-Cr-W-V Gradient Coating and Finite Element Analysis

采用类似于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。在工作层中添加0%~0.2%的稀土氧化铈,利用激光熔覆的方法将材料熔覆到45号钢基体上。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、耐蚀性。添加0.1%Ce2O3的复合涂层性能最优,其表面硬度可达62.2HRC,相对耐磨性较无稀土的复合涂层可提高20%。添加Ce2O3含量0.1%和0.2%的复合涂层耐蚀性相对未添加稀土涂层分别提高1.88倍、1.72倍。利用Marc软件对过渡层熔覆过程进行模拟,将模拟的应力值与小孔法测量的应力值进行比较,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812MPa,确定最佳梯度层成分M2为最优。

The material similar to high-speed steel is used as the working layer,and the main element content is reduced as a transition layer on the basis of working layer composition.0%-0.2%rare earth cerium oxide was added into the working layer and laser cladding was used to clad the material onto the substrate No.45steel The results show that adding a certain amount of rare earth can refine the grains and improve their hardness,wear resistance,and corrosion resistance.The composite coating with 0.1%Ce2O3has the best performance,and its surface hardness can reach 62.2HRC.The relative wear resistance can be increased by 20%compared with the rare earth-free composite coating.The corrosion resistance of the composite coatings with 0.1%Ce2O3and 0.2%Ce2O3 were 1.88times and 1.72times higher than that of the rare earth coatings without Ce2O3,respectively.The Marc software is used to simulate the cladding process of the transition layer.The simulated stress value is compared with the stress value measured by the small hole method.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 after increasing the transition layer.The measured working layer is 812 MPa horizontally,and the optimal gradient layer composition M2is determined to be optimal.