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通过扫描电子显微镜、透射电子显微镜、XRD技术、EBSD分析、动态相变规律研究以及力学性能测试,研究了不同热处理工艺及合金元素V的加入对高碳铬轴承钢GCr15的显微组织和性能的影响。结果表明,强碳化物形成元素V添加后,动态CCT曲线向右下方移动,抑制了二次碳化物的析出和珠光体转变,Ms点降低;添加V后,淬回火处理和贝氏体等温淬火处理后强度、硬度和冲击韧性均有不同程度提高;通过添加合金元素V,可以消除淬回火处理过程中出现的淬火微裂纹,提高性能;V的添加还能降低热处理后残留奥氏体含量,提高工件尺寸稳定性;尽管,添加V会很小程度的抑制贝氏体转变,考虑到V对性能的贡献,综合考虑认为,高碳铬轴承钢中添加V利大于弊。
The microstructure and properties of high-carbon chromium bearing steel GCr15 were studied by scanning electron microscopy, transmission electron microscopy, XRD, EBSD analysis, dynamic phase transformation and mechanical properties testing. influences. The results show that the dynamic CCT curve shifts to the lower right after the formation of the carbide-forming element V. The precipitation of secondary carbides and the pearlite transformation are inhibited, and the Ms point is decreased. After addition of V, the quenching and tempering treatment and the bainite isothermal After quenching, the strength, hardness and impact toughness are improved to some extent. By adding alloying element V, quenching micro-cracks appearing in the quenching and tempering process can be eliminated and the performance can be improved. The addition of V can also reduce the retained austenite after the heat treatment Content, to improve the dimensional stability of the workpiece; Although, the addition of V will be a small degree of inhibition of bainitic transformation, taking into account the contribution of V on the performance, considering the high carbon chromium bearing steel to add V benefit outweigh the disadvantages.