在滚动接触疲劳试验机上,对不同残余奥氏体含量的18Cr2Nj4WA 钢制成的滚轮试样进行了试验.试验结果表明,残余奥氏体含量商的试样比含量低的试样具有较好的接触疲劳性能.认为奥氏体内超细团粒的出现,形成微观双相组织,可能是提高接触疲劳抗力很重要的因素.此外,形变诱发马氏体相变及残余应力的增加等对接触疲劳抗力的提高,也起一定的作用.
Experiments were carried out on a rotary contact fatigue testing machine with two roller specimens made of the commercial 18Cr2Ni4WA steel bearing different amounts of retained austenite under various regimes of heat treatment. Results show that the specimen with more retained austenite is superior in con- tact fatigue resistance to that with less one.It is believed to be significant for improving the contact fatigue resistance by the formation of micro-duplex structure during testing because of the existence of the super fine granule in austenite matrix.In addition,thedeformation-induced martensitic transformation and beneficial distribution of the residual stresses may also contribute to the contact fatigue resistance to certain extent.
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