
Based on the finite element software, the temperature field, stress-strain field and their coupling in the casting process of carbon steel and high chromium cast iron bimetal were numerically simulated. The mathematical model is established by using appropriate initial conditions, boundary conditions and interface thermal resistance of carbon steel and high chromium cast iron to improve the analysis accuracy of numerical simulation and provide a valuable reference for the follow-up implementation of casting liner forming process.
The thermal structure affinity analysis based on the solidification process of bimetal casting liner is carried out:
- the temperature field analysis results show that: near the composite interface, it can be seen that the high-temperature carbon steel poured later will transfer heat to the high chromium cast iron poured first, providing the necessary temperature conditions for the formation of metallurgical bonding near the interface;
- the results of stress field analysis show that the stress concentration at the interface should be focused during solidification, and appropriate heat treatment process should be adopted to eliminate the residual stress and prevent the material from cracking at the joint surface;
- the strain field analysis results show that: in order to ensure the dimensional accuracy of the casting lining plate to be installed in the ball mill smoothly, it can be considered to reduce the design radius of the circular arc surface of the carbon steel layer of the casting lining plate. When the casting lining plate solidifies and shrinks, it will automatically increase the radius to compensate for the deformation to adapt to the installation circular arc surface in the ball mill.