Effect of quenching cooling rate on microstructure and mechanical properties of 51CrV4 steel
51CrV4 steel was quenched by oil,HX-2000 and PAG with different concentrations.The effect of quenching cooling rate on microstructure and mechanical properties of the 51CrV4 steel was studied by means of optical microscope,scanning electron microscopy(SEM),electron backscatter diffraction(EBSD)technique,tensile experiments and Rockwell hardness tester.The results show that increasing quenching cooling rate has obvious refining effect on martensitic laths,and the product of strength and plasticity of the 51CrV4 steel increases first and then decreases with the increase of quenching cooling rate.After using 13%PAG quenching and then tempering at 400℃for 100 min,the comprehensive mechanical properties of the 51CrV4 steel are the best:the yield strength and tensile strength are 1317.26 and 1560.89 MPa,respectively,the elongation and reduction of area are 10.50%and 55.38%,respectively,the hardness is 47.4 HRC,and the product of strength and plasticity reaches 16.39 GPa%.
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