Study on the effect of tempering process on the strength and toughness of 1.9 GPa grade ultra-high strength wear-resistant steel
Under the background of double carbon,the development of super wear-resistant steel products with higher strength and better wear resistance can further reduce the economic loss and resource waste caused by material wear.The ultra-high strength wear-resistant steel with tensile strength of 1.9 GPa was developed.Through reasonable chemical composition design and heat treatment process,the ultra-high strength wear-resistant steel with good comprehensive properties was trial-produced,and the effect of tempering temperature on its microstructure and mechanical properties was studied.The results showed that the excellent comprehensive mechanical properties of the trial plate were obtained by quenching at 880 ℃ and tempering at 180 ℃.The tensile strength was 1 951 MPa,the elongation was 14％,and the impact energy at-40 ℃ was 45.6 J.The microstructure of the plate was fine lath martensite,and there was a small amount of lamellar austenite between the laths,which increased the toughness of the plate.Among the various strength increment contributions,Ti(C,N)and Nb(C,N)nano-carbides produced by microalloying provide a precipitation strengthening increment of 243 MPa.After tempering at 180 ℃,high-density quenched dis-locations were still retained,providing a dislocation strengthening increment of 828 MPa.
万方数据
维普
