摘要
实验室对新能源车用GCr15轴承钢开展了油淬及不同回火工艺热处理试验,通过OM、SEM、摩擦磨损试验等手段研究了回火工艺对新能源车用GCr15轴承钢组织和摩擦磨损性能的影响,结果表明:当回火温度为180℃、320℃和550℃时,试验钢主体组织分别为回火马氏体、回火屈氏体和回火索氏体.在干摩擦条件下,试验钢摩擦系数和磨损率随着回火温度升高逐渐增大,其平均摩擦系数、磨损率分别从0.68、6.09×10-7 cm3/N·m增加到0.73、17.61×10-7 cm3/N·m.试验钢磨痕深度和宽度与回火温度成正相关关系,其磨痕深度和宽度分别从82 μm、1.71 mm扩大为174 μm、2.40 mm.
Abstract
The laboratory carried out heat treatment tests on GCr15 bearing steel for new energy vehicles with oil quenching and different tempering processes.The effects of tempering temperature on the friction and wear perfor-mance and microstructure of bearing steel for new energy vehicles were investigated using methods such as Optical microscope(OM),Scanning Electron Microscopy(SEM),and wear testing,and the results indicate that at tempering temperatures of 180℃,320℃,and 550℃,the microstructure of the experimental steel consists of tempered mar-tensite,tempered bainite,and tempered sorbite,respectively.Under dry friction conditions,the friction coefficient and wear rate of the test steel gradually increased with the increase of tempering temperature,and the average friction co-efficient and wear rate increased from 0.68,6.09×10-7 cm3/N·m to 0.73,17.61×10-7 cm3/N·m,respectively.The depth and width of the grinding marks of the test steel were positively correlated with the tempering temperature,and the depth and width of the grinding marks were expanded from 82 μm and 1.71 mm to 174 μm and 2.40 mm,re-spectively.
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