Numerical Modeling of Microstructure and Properties of Wear-resistant Layer Fabricated by Overlaying with different Wire Compositions

In order to investigate the influence of the composition in DG09 steel on the microstructure and properties of the wear-resistant layer manufactured by overlaying welding on the guide slippers of coal-cutters, the finite element method (FEM) simulations were used. After importing the physical parameters of the filler metal with different Cr and Ni contents calculated by JMatPro into the FEM software, the evolution of the temperature was simulated. The simulated results showed that the first layer melted when the second layer was welding. The microstructure and properties of the wear-resistant layer were simulated. The results revealed that reducing the Cr and Ni content increases the tensile strength and hardness of the wear-resistant layer. In addition, the microstructure of the wear-resistant layer fabricated by designed fillers was the martensite phase. The simulation results not only demonstrate that reducing the Cr and Ni content in DG09 steel can improve the mechanical properties, but also provide a theoretical basis for the design of low-cost filler metal.