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本文的目的是研究在跑合过程中钢表面行为的变化,特别是氧化膜的形成。跑合试验是在“柱-盘”试验机上进行的,采用滚动轴承中的滚柱为固定圆柱,不同硬度的4340钢为转动的圆盘试样。氧化膜的成分及厚度分别用原子吸收光谱仪及椭圆仪进行测定。另外还测量了跑合过程中的磨损失重、摩擦系数及显微硬度的变化。氧化膜、磨痕表面和截面及磨屑的形貌分别用光学显微镜、TEM及SEM 进行了研究。在全部试验研究的基础上获得了对跑合过程更深入的认识,并提出了一些新的观点。
The purpose of this paper is to investigate the behavior of steel surface during the running-in process, especially the formation of oxide film. Run-in test is carried out in “column-plate” testing machine, the roller in the rolling bearing is a fixed cylinder, 4340 steel with different hardness is a rotating disk sample. The composition and thickness of the oxide film were measured with an atomic absorption spectrometer and an ellipsometer, respectively. In addition, the changes of wear weight loss, friction coefficient and microhardness in running-in process were also measured. The morphology of oxide film, wear scar surface, cross section and wear debris were studied by optical microscope, TEM and SEM respectively. On the basis of all the experimental studies, we got a deeper understanding of the running-in process and put forward some new ideas.