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        Effect of Short-Time Carburizing Treatment on Microstructure and Mechanical Properties of M50 Steel

        Yinghua Wei,Xingfu Yu,Shuai Wang,Xiangyang Shen,Wenzeng Zhao,Yong Su,Yu Yang,Xiaochuan Feng 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.6

        By using scanning electron microscope (SEM), transmission electron microscope (TEM), X-Ray diffraction (XRD), and hardnessand rotational bending fatigue tests, the effect of short-time carburizing treatment on the microstructure and mechanicalproperties of bearing steel was studied. The results show that when the M50 steel is not carburized, the hardness is 750 HV,the rotational bending fatigue limit is 1100 MPa, and the impact absorption energy is 15.46 J. After short-time carburizationwith the carbon potential of 0.6%, the maximum hardness in the carburized area, the rotational bending fatigue limitand the impact absorption energy are all increased to be 807.7 HV, 1210 MPa and 16.72 J respectively. When the carbonpotential is further enhanced to be 0.8%, the maximum hardness of the carburized area of the steel is further enhanced to be813.4 HV, but the rotational bending fatigue strength and the impact absorption energy are both decreased to be 1125 MPaand 13.65 J respectively, which has close relations with the increasement of undissolved carbides and the precipitation ofacicular carbides.

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