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这是我们研究球墨铸铁滚动接触疲劳性能的第二篇报告。本文研究了稀土镁铜钼贝氏体球铁的接触疲劳性能(包括铜、钼含量和等温淬火工艺对接触疲劳性能的影响);使用光学显微镜、立体显微镜和扫描电镜对球铁的接触疲劳破坏过程作了进一步的探计;根据赫兹公式,推导出了剥落坑深度与最大接触压应力之间的关系式,并将实测的剥落坑深度与之对照,认为最大剪应力可能是等温贝氏体球铁皮下石墨尖角和非金属夹杂物处形成接触疲劳裂纹的动力。
This is our second report on the study of rolling contact fatigue properties of ductile iron. In this paper, the contact fatigue properties of rare earth magnesium-copper-molybdenum bainitic ductile iron (including copper and molybdenum content and the effect of isothermal quenching process on contact fatigue properties) were studied. The contact fatigue of ductile iron was destroyed by optical microscope, stereomicroscope and scanning electron microscope According to the Hertz formula, the relationship between the depth of peel pits and the maximum contact compressive stress was deduced, and the measured peel pit depth was compared with that of the maximum shear stress which may be isothermal bainite Ball iron under the graphite sharp corners and non-metallic inclusions at the contact fatigue cracks force.