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Abstract
Through the heat treatment of 0.8Cr–2.2Mn–0.3Mo–1.0Si–0.004B–0.45C (wt%) bainitic steel (i.e., 45Mn2 bainitic steel), the influence of different heat treatment parameters on microstructure evolution and mechanical properties of 45Mn2 bainitic steel was studied. Optical microscope, Scanning electron microscope, X-ray diffraction, hardness testing and abrasion testing were used for analysis. The results show that the microstructure of 45Mn2 bainitic steel after quenching is lower bainitic ferrite + residual austenite + M/A. When the austenitizing temperature increases, the volume fraction of residual austenite and M/A increases, and the hardness and abrasion resistance first increase and then decrease. At 910 °C, the hardness is the highest, while the wear resistance is the best. After quenching at 910 °C and different tempering temperatures, it is found that the microstructure has no obvious change, and the hardness and wear resistance are the highest when tempered at 240 °C.
Published Version
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