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在不同表面温度下对TC4钛合金试样进行激光温喷丸实验,使用频率响应法测试TC4钛合金试样的一阶弯曲振动共振频率和阻尼比,测定了喷丸区域半高宽值(FWHM),研究在不同试样表面温度下激光喷丸对TC4钛合金阻尼特性的影响,分析激光温喷丸中试样表面温度与最终一阶弯曲振动阻尼比的关系,讨论了不同试样表面温度对试样阻尼性能的影响机制。结果表明:在进行激光温喷丸时,试样在动态应变时效温度下形成的高密度位错对阻尼特性有重要影响,随着试样表面温度的上升,试样处理后的一阶弯曲振动阻尼比不断升高,在表面温度达到350℃时试样最终处理后阻尼比达到最大值;与激光喷丸技术相比,TC4试件的阻尼比从2.1%提升到了3.2%,表明了激光温喷丸可以有效减小振动工况下的振动应力。
The laser shot peening test was carried out on TC4 titanium alloy specimens at different surface temperatures. The first-order bending vibration resonance frequency and damping ratio of TC4 titanium alloy specimens were measured by frequency response method. The FWHM The effects of laser shot peening on the damping properties of TC4 titanium alloy at different sample surface temperatures were studied. The relationship between the surface temperature of the laser shot peening and the final first-order bending vibration damping ratio was analyzed. The effects of different surface temperatures Influence on the damping properties of the sample. The results show that the high density dislocations formed at the dynamic strain aging temperature have an important influence on the damping properties of the sample during the laser shot peening. With the increase of the sample surface temperature, the first-order bending vibration When the surface temperature reaches 350 ℃, the damping ratio reaches the maximum after final treatment. Compared with the laser shot peening technology, the damping ratio of TC4 specimen increases from 2.1% to 3.2%, indicating that the laser temperature Shot peening can effectively reduce the vibration stress vibration conditions.