| 李伟,张继旺*,王华强,鲁连涛.微粒子喷丸对等温淬火球墨铸铁超高周疲劳性能的影响[J].实验力学,2016,31(6):803~808 |
| 微粒子喷丸对等温淬火球墨铸铁超高周疲劳性能的影响 |
| On the Effect of Micro-Shot Peening on Very High Cycle Fatigue Performance of Austempered Ductile Iron |
| 投稿时间：2016-08-15 修订日期：2016-09-30 |
| DOI：10.7520/1001-4888-16-308 |
| 中文关键词: 等温淬火球墨铸铁 微粒子喷丸 超高周疲劳 S-N疲劳寿命曲线 疲劳强度 |
| 英文关键词:austempered ductile iron micro-shot peening very high cycle fatigue S-N fatigue-life curve fatigue strength |
| 基金项目:国家自然科学基金(51305363)；中央高校基本科研业务费专项资金(2682014CX041) |
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| 中文摘要: |
| 为分析微粒子喷丸工艺对等温淬火球墨铸铁(ADI)超高周疲劳性能的改善情况，利用旋转弯曲疲劳试验机开展了ADI 109循环周次疲劳试验。对比分析了经微粒子喷丸处理前后试样的疲劳性能,并利用扫描电镜对断口表面进行观察,分析了其超高周疲劳破坏行为。结果表明:未喷丸和喷丸处理后ADI的S-N曲线均表现为典型的阶梯下降型，且在超高周区域没有传统疲劳极限。微粒子喷丸可显著提高原始材料高周阶段的疲劳强度,超高周阶段的疲劳强度也有一定程度的提升。断口观察显示，超高周阶段两种试样均起裂于内部的缩孔或石墨球,并且部分断口表面可观察到粒状亮面GBF(granular bright face)区域。微粒子喷丸所引入的硬化层及残余压应力迫使疲劳裂纹萌生位置向内部转移。通过降低裂纹萌生位置的应力可改善旋转弯曲条件下超高周阶段的疲劳强度。 |
| 英文摘要: |
| In order to investigate the effect of micro-shot peening technology on very high cycle fatigue performance of austempered ductile iron (ADI), 109 cycle times fatigue experiment was carried out based on a rotating bending fatigue tester. The fatigue performance of specimen before and after micro-shot peening treatment was compared and analyzed, and the fracture surface was observed by scanning electron microscope (SEM), the failure behavior of very high cycle fatigue was analyzed. Results indicate that both S-N curves of ADI, which is subjected to shot peening treatment or not subjected to shot peening treatment, were all shown as a typical ladder descent type, and there is not conventional fatigue limit in the very high cycle range. Micro-shot peening technology can obviously improve the fatigue strength of original material in high cycle fatigue range, and the fatigue strength in very high cycle range is also improved at certain degree. Fracture surface observation show that in very high cycle range, both specimens crack initiate in internal shrinkages or graphite balls, and on a part of fracture surfaces, granular bright face (GBF) area can be observed. The hardening layer and residual compressive stress induced by micro-shot peening force the inward transfer of crack initiation position. Through reducing the stress at the crack initiation position, the fatigue strength in very high cycle range can be improved under rotating bending condition. |
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