Volume 5, Issue 9 (October 2008)
Determination of Surface Heat Transfer Coefficients of Cr12MoV Steel Cylinder during High-Speed Gas Quenching at Atmospheric Pressure
In the numerical simulation of quenching processes, establishment of the boundary conditions for the temperature field and stress field are very important. However, determination of the boundary conditions of the temperature field is very complicated. In order to simulate the thermal strain, thermal stress, residual stress, and microstructure of the steel during high-speed gas quenching at atmospheric pressure using a numerical method, it is necessary to obtain an accurate boundary condition of temperature field. The surface heat transfer coefficient is a key parameter. The explicit finite difference method, nonlinear estimate method, and the experimental relationship between temperature and time during quenching have been used to solve the inverse problem of heat conduction during gas quenching. The relationships between surface temperature and surface heat transfer coefficient of a solid cylinder are provided here. In addition, it is shown that this technique can determine the effective surface heat transfer coefficients during high-speed gas quenching.