Study on Flow Stress of 20CrMo Alloy Steel Under Hot Compression Deformation
The hot compression experiment of 20CrMo alloy steel was carried out by Gleeble-3500 thermal-mechanical simulator at the temperature of 900 ℃,1000 ℃,1100 ℃ and 1200 ℃,the strain rates of 10 s-1,1 s-1 and 0.1 s-1 and the compress degree of 70%.The rules of flow stress behavior were studied.The experimental results indicate that there is stress dis-continous yielding phenomenon of the flow stress at the compression temperature of 900 ℃ and the strain rate of 10 s-1.The flow stress of 20CrMo alloy steel during high temperature deformation can be presented by Arrhenius equation,and the hot deformation activation energy(Q) is 650 kJ/mol.