Research of 34CrNiMo6 steel CCT curve and quenching and tempering heat treatment process
Temperature expansion curves of 34CrNiMo6 steel at different cooling rates were measured by DIL805 high tem-perature quenching phase transformation instrument.CCT curves of 34CrNiMo6 steel were measured by expansion method combined with microstructure.Relationship between microstructure and cooling rate of 34CrNiMo6 steel was explored.Con-tinuous cooling phase transformation behavior of 34CrNiMo6 steel was studied and conducted experiments on quenching and tempering heat treatment processes at different tempering temperatures.Results show that section shrinkage and elongation of 34CrNiMo6 steel increase from 54.2％and 14.9％to 69.6％and 22.2％respectively with tempering temperature in-creasement,tensile strength and yield strength decrease from 1 082 MPa and 952 MPa to 913 MPa and 782 MPa,and Low temperature impact energy is positively correlated with tempering temperature.Combining with mechanical properties varia-tion at different temperature,the optimum tempering temperature is determined to be 620℃.
34CrNiMo6 steelmicrostructurelow temperature impact energymechanical property
万方数据
维普
