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首页> 外文OA文献 >Comparison between Shot Peening, Cavitation Peening, and Laser Peening by Observation of Crack Initiation and Crack Growth in Stainless Steel
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Comparison between Shot Peening, Cavitation Peening, and Laser Peening by Observation of Crack Initiation and Crack Growth in Stainless Steel

机译：不锈钢裂纹启动和裂纹增长的射击喷丸，空化喷丸和激光喷丸的比较

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摘要

The traditional technique used to modify the surface of a metallic material is shot peening; however, cavitation peening, a more recent technique in which shot is not used, was developed, and improvements in the fatigue strength of metallic materials were demonstrated. In order to compare the fatigue properties introduced by shot peening with those introduced by cavitation peening, crack initiation and crack growth in specimens of austenitic stainless steel (Japanese Industrial Standards JIS SUS316L) treated using these techniques were investigated. With conventional cavitation peening, cavitation is produced by injecting a high speed water jet into water. In the case of submerged laser peening, bubbles are generated using a pulsed laser after laser ablation, and the impact produced when the bubbles collapse is larger than that due to laser ablation. Thus, in this study, cavitation peening using a water jet and submerged laser peening were investigated. To clarify the mechanisms whereby the fatigue strength is improved by these peening techniques, crack initiation and crack growth in specimens with and without treatment were examined by means of a K-decreasing test, where K is the stress intensity factor, and using a constant applied stress test using a load controlled plane bending fatigue tester. It was found that the improvement in crack initiation and the reduction in crack growth were roughly in a linear relationship, even though the specimens were treated using different peening methods. The results presented here show that the fatigue strength of SUS316L treated by these peening techniques is closely related to the reduction in crack growth, rather than crack initiation.
机译：用于改变金属材料表面的传统技术被抛出喷丸;然而，浮雕喷丸，未使用射击的更新技术，并且证明了金属材料的疲劳强度的改进。为了比较用射击喷丸引入的疲劳性能，研究了使用这些技术处理的奥氏体不锈钢（日本工业标准JIS SUS316L）的裂纹启动和裂纹生长。通过传统的空化喷丸，通过将高速水射流注入水中产生空化。在浸没激光喷丸的情况下，使用激光烧蚀后使用脉冲激光产生气泡，并且当气泡塌陷大于由于激光消融而产生的冲击。因此，在该研究中，研究了使用水射流和浸没激光喷丸的空化喷丸。为了通过这些喷丸技术改善疲劳强度的机制，通过K降低试验检查具有和不使用处理的样品中的裂纹引发和裂纹生长，其中K是应力强度因子，并使用恒定的施加使用负载控制平面弯曲疲劳测试仪的应力测试。发现，即使使用不同的喷丸方法处理样品，裂纹引发的改善和裂缝生长的降低粗略地是线性关系。这里提出的结果表明，这些喷丸技术处理的SUS316L的疲劳强度与裂纹生长的降低密切相关，而不是裂纹引发。

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    Hitoshi Soyama;

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  • 年度 2019
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