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首页> 外文会议>SEM IX International Congress on Experimental Mechanics June 5-8, 2000 Orlando, Florida >Evaluation of fatigue properties on shot-peening treated ductile cast irons
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Evaluation of fatigue properties on shot-peening treated ductile cast irons

机译：喷丸处理的球墨铸铁的疲劳性能评估

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摘要

Rotating bending fatigue tests were carried out on specimens of two kinds of ductile cast iron (ferrite-pearlitic one, FPDI and pearlitic one, PDI) with shot-peening (SP) treatment, and influences of the SP treatment on fracture morphologies and fatigue properties were investigated from view points of crack behaviors and residual stress changes. It is expected that the SP treatment results not only the high level of work-hardenign and the high level compressive residual stress on the surface layer of the specimens, but also the decrease in casting defects in near surface, then, they lead a considerable improvement of fatigue strength. Therefore, initial distribution of the resudual stress in the surface layer of the SP treated specimens was measured, then, the changes in residual stress were investigated during cyclic stressign. Furthermore, differences in fatigue fracture morphologies in the short and the long regions of fatigue life were discussed from detailed observations of crack initiation site with a scanning electron microscopy (SEM).
机译：对两种球墨铸铁进行了喷丸强化处理，然后对它们进行了旋转弯曲疲劳试验（铁素体-珠光体，FPDI和珠光体，PDI），以及SP处理对断裂形态和疲劳性能的影响。从裂纹行为和残余应力变化的角度进行了研究。预计SP处理不仅会导致试样表面层出现高水平的加工硬化和较高的压缩残余应力，而且还会减少近表面的铸件缺陷，从而带来显着的改善疲劳强度。因此，测量了经SP处理的试样表面层中残余应力的初始分布，然后研究了循环应力过程中残余应力的变化。此外，通过用扫描电子显微镜（SEM）对裂纹萌生部位的详细观察，讨论了疲劳寿命的短期和长期区域中疲劳断裂形态的差异。

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