Effects of quenching temperature on tempering microstructure and mechanical properties of 30MnB steel

This article presents the effects of quenching temperature on tempering microstructure, mechanical properties and wear resistance of 30MnB steel were studied. The results showed that: The microstructure of 30MnB steel was the tempered martensite and retained austenite after quenching at 840 degrees c-900 degrees c and then tempering at 200 degrees c. the carbide precipitation did not occur when 30MnB steel was tempered at 200 degrees c, only the carbon segregation occurred. Meanwhile, the tensile strength of 30MnB was all above 1350MPa after quenching at 840 degrees c-900 degrees c and then tempering at 200 degrees c, the -40 degrees c ballistic work was above 20J, indicating that it had good low temperature impact toughness. 30MnB had minimum abrasion loss after quenching at 880 degrees c and then tempering at 200 degrees c, the wear morphology was fine wear mark, shallow furrow and ridge augmentation.