Calculation of the Surface Heat-transfer Coefficients of W18Cr4V Steel during High Velocity Gas Quenching

摘要

The surface heat-transfer coefficients during high velocity gas quenching is calculated by explicit finite difference method, nonlinear estimate method and the experimental relation between temperature and time. The relations between surface heat-transfer coefficient in 60m/s and surface temperature of steel cylinders are given. Based on the solved surface heat-transfer coefficients, the temperature field is obtained by solving heat conduction. In calculation, the thermal physical properties of material are treated as the functions of temperature. The results of calculation coincide with the results of experiment.