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首页> 外文期刊>Journal of Materials Engineering and Performance >Another Mechanism for Fatigue Strength Improvement of Metallic Parts by Shot Peening
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Another Mechanism for Fatigue Strength Improvement of Metallic Parts by Shot Peening

机译：喷丸强化金属零件疲劳强度的另一种机理

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摘要

Fatigue crack source in shot-peened specimens may be located either at the surface or in the interior, beneath the hardened layer. In this paper, the mechanism for fatigue strength improvement of shot-peened specimens with internal fatigue crack source was studied. Un-peened and shot-peened specimens made of quenched and low-temperature tempered 40CrNi2Si2Mo2V steel were used. The fatigue crack source in shot-peened specimen is found in the interior beneath the hardened layer. X-ray diffraction analyses of both kinds of specimen fatigue tested a stress equal to their apparent fatigue limit show that obvious changes have taken place in the surface layer for un-peened specimens, while for shot-peened specimens, such changes are observed in the sub-surface layer beneath the hardened layer. The calculated actual critical stress at the fatigue source position (the "internal fatigue limit") for shot-peened specimen is about 138 percent of the (surface) fatigue limit of un-peened specimen. According to an analysis about the micro-meso-processes of fatigue crack initiation in metals, a concept of "internal and surface fatigue limits of metal" has been proposed. It is believed that the fatigue crack source transfers into the interior, Also, the internal fatigue limit of metal is higher than its surface fatigue limit, and is another mechanism for the improvement of apparent fatigue limit of shot-peened specimen.
机译：喷丸处理试样中的疲劳裂纹源可位于表面或内部，位于硬化层下方。本文研究了具有内部疲劳裂纹源的喷丸试样疲劳强度提高的机理。使用由淬火和低温回火的40CrNi2Si2Mo2V钢制成的未喷丸和喷丸试样。喷丸强化试样的疲劳裂纹源位于硬化层下方的内部。两种样品疲劳试验的X射线衍射分析表明，在压力等于其表观疲劳极限的情况下，未喷丸试样的表层发生了明显的变化，而喷丸试样的表层发生了这种变化。硬化层下面的亚表层。喷丸试样在疲劳源位置（“内部疲劳极限”）的计算得出的实际临界应力约为未喷丸试样的（表面）疲劳极限的138％。根据对金属疲劳裂纹萌生的微观过程的分析，提出了“金属内部和表面疲劳极限”的概念。据信疲劳裂纹源转移到内部，并且金属的内部疲劳极限高于其表面疲劳极限，并且是提高喷丸处理的试样的表观疲劳极限的另一机制。

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