Abstract The tribological behavior of austempered ductile iron (ADI) obtained at different austempering temperatures is investigated. The microstructure of ADI is consisted of spheroidal graphite, retained austenite and acicular ferrite. The volume fraction of retained austenite and the thickness of acicular ferrite increase with increasing austempering temperature, which results in strength reduction but plasticity increasement. With the increase of austempering temperature, the friction coefficient changes little under low load (5 N) but decreases under high loads (10 N and 15 N), whilst the wear rate increases under low load (5 N) but changes little under high loads (10 N and 15 N). This wear behavior is attributed to the combined effects of hardness and friction coefficient. Additionally, adhesive and abrasive wear are main failure mechanisms for ADI under dry sliding wear condition.

中文翻译：

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不同奥氏体回火温度下奥氏体球墨铸铁 (ADI) 的摩擦学行为

摘要 研究了在不同等温淬火温度下获得的等温球墨铸铁 (ADI) 的摩擦学行为。ADI的显微组织由球状石墨、残余奥氏体和针状铁素体组成。随着奥氏体回火温度的升高，残余奥氏体的体积分数和针状铁素体的厚度增加，导致强度降低但塑性增加。随着等温回火温度的升高，摩擦系数在低负荷（5 N）下变化不大，在高负荷（10 N和15 N）下下降，而磨损率在低负荷（5 N）下增加，但在高负荷下变化不大（10 牛顿和 15 牛顿）。这种磨损行为归因于硬度和摩擦系数的综合影响。此外，