Abstract Additive manufacturing (AM) can produce parts with complex shapes quickly; therefore, it is applied in the manufacturing of impellers for pumps and screws for ships. However, cavitation erosion may occur in these fluid machine components. The fatigue strength and fatigue life of parts manufactured through AM are weaker than those of bulk metals, and the surfaces of these parts are rough owing to AM. Thus, the cavitation erosion resistance of the AM metal may be weaker than those of bulk metals. In this study, to investigate the cavitation erosion resistance of the AM metal, a cavitation erosion test was conducted by using a cavitating jet. The test specimens of titanium alloy Ti–6Al–4V manufactured through electron beam melting were treated using various peening methods that succeeded in improving the fatigue strength of the AM metal. The cavitation erosion resistance of the as-built AM metal without surface treatment was much lower than that of the bulk metal. When the results of the AM metal treated using various peening methods were compared with those of the as-built metal, the erosion rate was observed to have decreased by approximately 40% and 95% for cavitation peening and abrasive cavitation peening, respectively. Therefore, it was found that the cavitation erosion resistance of the AM metal can be improved through peening treatment.

中文翻译：

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通过增材制造和各种喷丸方法制造的钛合金 Ti-6Al-4V 的抗空蚀性

摘要 增材制造（AM）可以快速生产复杂形状的零件；因此，它用于制造泵的叶轮和船舶的螺杆。然而，在这些流体机械部件中可能发生气蚀。通过增材制造的零件的疲劳强度和疲劳寿命比大块金属要弱，而且这些零件的表面因增材而变得粗糙。因此，AM 金属的抗空蚀性可能比块状金属弱。在这项研究中，为了研究 AM 金属的抗空蚀性，使用空化射流进行了空蚀试验。通过电子束熔化制造的钛合金 Ti-6Al-4V 试样使用各种喷丸方法进行处理，成功提高了 AM 金属的疲劳强度。未经表面处理的竣工 AM 金属的抗空蚀性远低于块状金属。将使用各种喷丸方法处理的 AM 金属的结果与竣工金属的结果进行比较时，观察到空化喷丸和磨料空化喷丸的侵蚀率分别降低了约 40% 和 95%。因此，发现通过喷丸处理可以提高AM金属的抗空蚀性。观察到空化喷丸和磨蚀空化喷丸的侵蚀率分别降低了约 40% 和 95%。因此，发现通过喷丸处理可以提高AM金属的抗空蚀性。观察到空化喷丸和磨蚀空化喷丸的侵蚀率分别降低了约 40% 和 95%。因此，发现通过喷丸处理可以提高AM金属的抗空蚀性。