After 1030 ℃ oil quenching,the effect of tempering temperature on the microstructure,precipitates and mechanical properties of the 40Cr13VTi steel containing V and Ti was studied to optimize the tempering process.The microstructure of the steel was analyzed by using optical microscope(OM),scanning electron microscope(SEM)and energy dispersive spectrometer(EDS).Tensile,impact and hardness tests were conducted on the tested steel.The results show that as the tempering temperature increases,the carbide precipitates gradually increase in number,and gradually change from particles to flakes in shape,which are consistent with the original martensite lath direction,and most of them are concentrated at the martensite boundary.When the tempering temperature is 350 ℃,the comprehensive mechanical properties of the 40Crl3VTi martensitic stainless steel are the best,with yield strength of 1360 MPa,tensile strength of 1717 MPa,impact absorbed energy of 6.8 J,and hardness of 43.1 HRC.
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