Introduction of Compressive Residual Stress Using a Cavitating Jet in Air
Introduction of Compressive Residual Stress Using a Cavitating Jet in Air
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DOI：
10.1115/1.1631434
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发表时间：
2004
影响因子：
1.2
通讯作者：
H. Soyama
中科院分区：
文献类型：
--
作者：
H. Soyama
来自空化射流的空化冲击可以用于以与喷丸类似的方式进行表面改性，所述空化射流由高速水射流在水中引起的气泡形成。空化射流通常通过将高速水射流注入充水腔室中来产生。通过将高速水射流注入围绕高速射流的同心低速水射流中，可以在空气中形成空化射流。为了证明这一点，一个高速水射流与同心低速水射流冲击到铝试样上，以观察侵蚀的模式。对试样的质量损失进行称重以测量射流的能力，因为更强大的射流产生更大的质量损失。结果表明，高速和同心低速水射流的组合产生了一个典型的侵蚀模式，如使用空化射流在充满水的腔室中获得。当同心低速水射流的喷射压力被优化时，空泡射流在空气中的能力远大于空泡射流在充水腔中的能力。结果表明，优化的空化射流在空气中比在充满水的腔室中在工具钢合金表面引入更多的压缩残余应力。此外，该应力大于喷丸所引起的应力。与喷丸处理相比，喷丸处理的表面也不那么粗糙。
Cavitation impact from a cavitation jet, which is formed from bubbles induced by a high-speed water jet in water, can be used for surface modification in a similar manner to shot peening. A cavitating jet is normally produced by injecting a high-speed water jet into a water-filled chamber. It is possible to make a cavitating jet in air by injecting a high-speed water jet into a concentric low-speed water jet that surrounds the high-speed jet. In order to demonstrate this, a high-speed water jet with a concentric low-speed water jet was impacted onto an aluminum specimen to observe the pattern of erosion. The mass loss of the specimen was weighed to measure the capability of the jet, since a more powerful jet produces a larger mass loss. It was shown that the combination of high- and concentric low-speed water jets produced a typical erosion pattern such as that obtained using a cavitating jet in a water-filled chamber. When the injection pressure of the concentric low-speed water jet was optimised, the capability of the cavitating jet in air was much greater than that of a cavitating jet in a water-filled chamber. It was demonstrated that an optimized cavitating jet in air introduced more compressive residual stress in the surface of tool steel alloy than that from a cavitating jet in a water-filled chamber. In addition, this stress was larger than that induced by shot peening. The peened surface was also less rough compared with shot peening.