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Research on the water cavitation peening process and mechanism of TC4 titanium alloy

机译：TC4钛合金水空化喷灌工艺及机理研究

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Cavitation water shot peening is a new processing method of surface strengthening and modification that utilizes the cavitation bubbles in the cavitation water jet to destroy high-energy shock waves, causing the cavitation groups to collapse on the surface of the material. Strengthening research on TC4 titanium alloy cavitation water jet peening is limited. The process of cavitation water shot peening strengthening is small, and the mechanism of residual stress generation is not yet clear. Therefore, five typical shot peening strength tests of TC4 titanium alloy are taken as examples in this paper. Experiments and mechanistic studies are carried out through macro-micromorphology, metallographic structure and XRD analysis, microhardness, and residual stress methods. The research results are as follows: as the shot peening strength increases, the surface roughness Ra and the depth of the plastic deformation layer gradually increase, and the depth of the plastic deformation layer is saturated at 55-60 mu m; the depth of the influence of the microhardness and residual stress reaches 130 mu m; and the surface grains gradually refine and develop to the nanometre level.
机译：空化水喷丸是利用空化水射流中的空化气泡破坏高能冲击波，使空化群在材料表面崩塌的一种新的表面强化改性处理方法。TC4钛合金空化水射流喷丸强化研究有限。空化水喷丸强化过程小，残余应力产生机理尚不清楚。因此，本文以五种典型的TC4钛合金喷丸强度试验为例。通过宏观微观形貌、金相组织和XRD分析、显微硬度和残余应力方法进行了实验和机理研究。研究结果表明：随着喷丸强度的增加，表面粗糙度Ra和塑性变形层深度逐渐增加，塑性变形层深度在55-60μm处达到饱和；显微硬度和残余应力的影响深度达到130μm；表面晶粒逐渐细化并发展到纳米级。

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