摘要
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 promotes stabilization of the retained austenite in the queuched GCr15ball-bearing steel upon cooling to subzero temperature,cycling of compressive stress and aging atroom temperature.Retained austenite will be induced to transform to martensite under stress cyclingthat will raise the contact fatigue life of steel parts,meanwhile isothermal martensitc stabilizes theretained austenite that results in beneficial effect on TRIP.The contact fatigue life of steel partisothermally treated with a few percentages of isothermal martensite is 36% higher than that aftersubzero treatment and 18% higher than that treated by normal quenching and tempering.Thedimensional stability of specimen treated isothermally is better than that treated by normal quen-ching and tempering by 34%.The accomodation deformation induced by the isothermal martensitetransformation leads to the mechanical stabilization of the retained austenite.
出处
《钢铁》
CAS
CSCD
北大核心
1990年第6期47-50,共4页
Iron and Steel
