【摘 要】
：
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(AD)I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℃、
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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(AD)I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0.4～0.6 mm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 the most common surface treatment method to improve the fatigue properties of metal workpieces. In this paper, the effect of shot peening on the fatigue properties of alloying ductile iron (AD) I was studied. Austempering includes austenitizing at 90 ° C for 90 min at 875 ° C followed by isothermal treatment at 320 ° C, 365 ° C and 400 ° C. Rotational bending fatigue test was carried out on shot peening specimens with a diameter of 0.4-0.6 mm. The samples were analyzed by XRD and SEM, the microhardness and roughness were measured to study the fatigue properties of the samples. The results show that the fatigue strength increases by 27.3%, 33.3% and 48.4% after shot peening at 320 ℃, 365 ℃ and 400 ℃ respectively.
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