喷丸处理是改进金属工件疲劳性能最常规的表面处理方法.文中研究了喷丸处理对合金化奥贝球铁(ADI)疲劳性能的影响.等温淬火包括875℃保温90 min奥氏体化处理,然后在320℃、365℃和400℃进行等温处理.用直径0.4～0.6mm的丸喷丸后的试样做旋转弯曲疲劳试验.对试样进行XRD和SEM分析,测定显微硬度和粗糙度,研究试样的疲劳性能.结果表明,在320℃、365℃和400℃等温处理的试样喷丸后疲劳强度分别增加了27.3％、33.3％和48.4％.%Shot peening is one of the most common surface treatments to improve the fatigue behavior of metallic parts. In this study the effect of shot peening process on the fatigue behavior of an alloyed austempered ductile iron (ADI) has been studied. Austempering heat treatment consisted of austenitizing at 875℃ for 90 min and following austempering at 320 ℃, 365 ℃ and 400 ℃. Rotating-bending fatigue test was carried out on samples after shot peening by 0.4 to 0.6 mm shots. XRD and SEM analysis, micro hardness and roughness tests were carried out to study the fatigue behavior of the samples. Results indicate that the fatigue strengths of samples austempered at 320 ℃, 365 ℃ and 400 ℃ are increased by 27.3%, 33.3% and 48.4%, respectively after shot peening process.
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