HOT-COMPRESSION DEFORMATION BEHAVIOR AND CONSTITUTIVE EQUATIONS OF LZ50 AXLE STEEL

A study of deformation behavior LZ50 axle steel has great significance to the railway industry. Hot-deformation tests were performed using a Gleeble-3800 thermal mechanical simulator at temperatures (900, 1000 and 1100) °C with strain rates (0.1, 1.0 10.0) s–1 under different degrees 0.2, 0.6 1.0. True stress-strain curves discussed obtain hot-processing maps. Then maps parameters including safe zones unsafe zones. Finally, constitutive equations dynamic recrystallization models established based on experimental data. The results show that rate 10.0 s–1, peak value flow stress increases by approximately 40 MPa decrease in temperature from 900 °C, which is larger than 18 obtained 1100 °C. At 900–1000 37 increasing 0.1 while increase 21 MPa. With an 0.2 1.0, instability area low expands due higher rate. activation energy 334.537 kJ/mol.