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Effect of shot peening on the fretting wear of Ti―6Al―4V

机译：喷丸喷丸对TI-6AL-4V微动磨损的影响

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In this paper, we report on the fretting wear behaviour of polished and shot peened Ti―6Al―4V specimens. For fretting experiments, due to micro-displacements at the interface between two contacting surfaces, two types of damage can be observed: crack initiation and debris formation. Shot peening, which is already well known for improving fatigue resistance of titanium alloys, is shown to have a beneficial effect on the crack initiation and propagation under fretting wear loading, as cracks observed on specimens after cylinder-on-flat fretting tests are shorter in shot peened specimens than in polished ones. It is also demonstrated that shot peening decreases the friction coefficient only at the beginning of the test, as long as the asperities induced by shot peening are not worn-off. The effects of displacement amplitude, normal force and test duration on the wear volume have been investigated: in all cases, shot peening has no significant impact on the wear process. The same amount of debris are formed and ejected for both polished and shot peened specimens. Moreover, it is found that, for both types of specimens, the linear relation, developed for steels and hard coatings, between wear volume and cumulated dissipated energy is not valid in the present case as different wear volumes are measured for the same cumulated dissipated energy, depending on the experimental conditions (normal force, displacement amplitude). Using the test duration as the variable parameter, energy wear coefficients are calculated for different experimental conditions.
机译：在本文中，我们报告了抛光和喷丸Ti-6Al-4V标本的磨损磨损行为。对于微动实验，由于两个接触表面之间的界面处的微位移，可以观察到两种类型的损伤：裂纹引发和碎屑形成。对于提高钛合金的疲劳抗性已经众所周知的射击喷丸，显示对磨损磨损载荷下的裂纹启动和传播具有有益的影响，因为在扁平的心碎试验上的样品上观察到的裂缝是短的射击喷丸标本比抛光的标本。还表明，只要通过射击喷丸诱导的粗糙度都没有磨损，射击喷丸率仅在测试开始时降低了摩擦系数。研究了位移幅度，正常力和测试持续时间对磨损体积的影响：在所有情况下，射击喷丸对磨损过程没有显着影响。形成相同量的碎片并为抛光和喷丸喷射标本形成。另外，对于两种类型的样品，对于钢和硬涂层的两种样本，在磨损体积和累积的散发能量之间的线性关系在当前情况下没有有效，因为针对相同的累积耗散能量测量不同的磨损量，取决于实验条件（正常力，位移幅度）。使用测试持续时间作为变量参数，计算用于不同的实验条件的能量磨损系数。

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