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本文研究了表面薄层残余奥氏体在接触疲劳过程中引起的表面尺寸和组织结构(残留奥氏体、马氏体及碳化物等)变化的规律,提出了用残留奥氏体进行表面层软化提高接触疲劳抗力的原因是:残留奥氏体局部塑变扩大接触面积降低实际接触应力能提高寿命,但它只占少部分,而大部分则是由于组织结构变化引起的。残留奥氏体应变诱发相变马氏体提高了表面层实际强度,延缓接触疲劳裂纹的产生与扩展。未转变完稳定化了的残留奥氏体有缓和应力集中的作用,能阻止接触疲劳裂纹的扩展,防止表层碳化物碎裂剥离作用。
In this paper, the rule of the variation of surface size and microstructure (retained austenite, martensite and carbides) caused by the surface thin layer of residual austenite during contact fatigue is studied. The effect of residual austenite on the surface layer The reasons for softening the contact fatigue resistance are: local plastic deformation of retained austenite to enlarge the contact area and reduce the actual contact stress can improve the life expectancy, but it only accounts for a small part, but most of them are caused by the structural changes. Residual austenite strain-induced martensite increases the actual strength of the surface layer and slows the generation and expansion of contact fatigue cracks. Stabilized retained austenite has the effect of alleviating the concentration of stress, can prevent the expansion of the contact fatigue crack, and prevent the peeling and peeling of the surface carbides.