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本文研究了马氏体等温处理时,贝氏体的相变过程与微观组织、先析贝氏体的强韧化规律和对接触疲劳性能的影响。马氏体等温处理时,贝氏体相变过程分快速和缓慢两个阶段完成。快速阶段奥氏体分解为典型高碳钢下贝氏体,碳化物为ε-碳化物。缓慢阶段分解的为 Fe_3C。马氏体等温处理时,先祈贝氏体分割过冷奥氏体晶粒,细化随后转变的马氏体领域与条束来赢得强度与韧性大幅度共同提高。接触疲劳寿命比低温回火马氏体高70%。
In this paper, the martensitic isothermal treatment, the phase transformation process and microstructure of bainite, pre-bainite toughening law and the impact on the contact fatigue properties. When the martensite isothermal treatment, the bainite transformation process is completed in two stages, rapid and slow. The rapid stage of austenite decomposition into a typical high-carbon steel bainite, carbides ε-carbide. Slow phase decomposition of Fe_3C. Martensitic isothermal treatment, the first pray bainite austenite grain refinement, refinement and subsequent martensite transformation of the field to achieve a substantial increase in strength and toughness. Contact fatigue life than low temperature tempered martensite 70%.