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等温马氏体可提高淬火 GCr15轴承钢中残余奥氏体在冷至零下温度,反复压应力作用下及室温时效的稳定性。残余奥氏体在反复应力作用下诱发马氏体相变,提高钢件的接触疲劳寿命,而等温马氏体对残余奥氏体的稳定化,使产生良好的 TRIP 作用。经等温处理形成少量等温马氏体,使钢件的接触疲劳寿命比冷处理的提高36%,比正常淬火及回火的提高18%。经室温时效1000天后,经等温处理的试样比正常淬火、回火的,提高尺寸稳定性达34%。等温马氏体的形成使残余奥氏体产生协作形变,因此呈现力学稳定性。
Isothermal martensite can improve the stability of residual austenite in quenched GCr15 bearing steel under cold to zero temperature, repeated compressive stress and room temperature aging. Retained austenite induced martensitic transformation under repeated stress to improve the contact fatigue life of steel, while the isothermal martensite on the retained austenite stabilization, resulting in a good TRIP effect. After isothermal treatment to form a small amount of isothermal martensite, the contact fatigue life of steel parts increased by 36% than the cold treatment, than the normal quenching and tempering increased by 18%. After 1000 days at room temperature aging, the sample after isothermal treatment than the normal quenching, tempering, improve the dimensional stability of 34%. The formation of the isothermal martensite causes the residual austenite to deform cooperatively, thus exhibiting mechanical stability.