Research on Numerical Simulation of Tempering Process of 18CrNiMo7-6 Steel after Carburizing and Quenching
Based on Deform-HT software,considering the influence of the decomposition of martensite and retained austenite on the microstructure,stress and hardness fields during tempering,the tempering process of 18CrNiMo7-6 alloy steel after carburizing and quenching was numerically simulated.In order to determine the parameters of martensite decomposition model,two kinds of full penetration specimens with different carbon contents(0.21％C and 0.80％C)were prepared and subjected to the expansion test.According to the expansion test,the parameters of different carbon content samples in the JMAK equation were calculated,and according to the JMatPro software,the parameters in the decomposition model of retained austenite were calculated.The changes of the microstructure field and stress field by tempering at 200 ℃ and 400 ℃ for 3 h after carburizing and quenching were simulated.The results show that with the increase of tempering temperature,the transformation amount of retained austenite and martensite increases significantly,and the residual stress decreases significantly.At the same time,a hardness change model can be established to predict the tempering process of 18 CrNiMo7-6 steel after carburizing and quenching.
temperingmartensite decompositionretained austenite decompositionhardness model
万方数据
维普
