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本研究对18Cr2Ni4WA钢渗碳和碳氮共渗层中的残留奥氏体,在接触应力和摩擦力作用下的相变行为,及其与渗层表面接触疲劳性能之间的关系,进行了实验考查;分析了两种热处理状态下残留奥氏体的相变特点、相变后的组织变化及断口形态。研究指出,应力状态和奥氏体的合金化,对渗层中残留奥氏体的应力促发和应变诱发马氏体相变行为有很大的影响;应力促发和应变诱发马氏体均使渗层的脆性增加。碳氮奥氏体较渗碳奥氏体具有较小的应力相变速率,这是碳氮共渗层表面接触疲劳性能高于碳渗层的重要原因。
In this study, 18Cr2Ni4WA steel carburizing and carbonitrided layer of retained austenite, the contact stress and friction under the action of phase transition, and contact with the surface layer of the contact fatigue properties were tested The phase transformation characteristics of the retained austenite, the microstructure change and the fracture morphology after the phase transformation were analyzed. It is pointed out that the stress state and the alloying of austenite have great influence on the stress induced and strain induced martensite transformation in the infiltrated layer. Both the stress induced and the strain induced martensite So that the permeability of brittleness increased. Carbonitrides and austenite have a lower rate of stress-phase transformation than carburized austenite, which is an important reason for the higher contact fatigue properties of carbonitrided layers than that of carburized carburized layers.