表面技术2024，Vol.53Issue(13)：128-138,11.DOI:10.16490/j.cnki.issn.1001-3660.2024.13.013
TC4钛合金表面固体粒子冲蚀损伤行为及机理研究
Solid Particles Erosion Damage Behaviour and Mechanism of TC4 Titanium Alloy Surface
摘要
Abstract
Erosion wear is one of the main failure modes of titanium alloy engine blades. In order to investigate the damage behavior of TC4 titanium alloy under solid particle erosion and reveal the erosion mechanism of titanium alloy surface. The erosion test of dry sand at normal temperature was carried out according to the orthogonal test method and the control variable method with TC4 titanium alloy as the research object. The surface and cross section of the erosion wear region were analyzed by scanning electron microscopy, and the element composition was analyzed by energy dispersive spectrometer. The erosion wear quality was measured by electronic balance. The effects of process parameters on the damage behavior and erosion mechanism of titanium alloy were discussed. Compared with the amount of sand and the impact angle, the erosion distance on the erosion wear quality was dominant. With the increase of impact angle, the erosion wear quality increased initially and then decreased, reaching a peak value near 40°. Combined with numerical simulation and experiment, it was found that the damage form and erosion mechanism of titanium alloy were closely related to the impact angle. At low impact angle, the horizontal component of abrasive speed was much larger than the vertical component, and the cutting action was much larger than the hammering effect. So relatively narrow furrows and extruded lips were formed, obvious plastic deformation occurred, and secondary impact was likely to occur, which was manifested as micro-cutting mechanism. In the middle impact angle, the micro-cutting machine and hammering effect coexisted. The cutting action was reduced, resulting in a reduction in groove length. However, with the increase of hammering force, the penetration depth of abrasive particles increased, and the transverse cracks appeared at a deeper location and the damage was the most serious. When the impact angle was 90°, more impact craters, extruded lips and a small amount of fatigue stripping were formed, mainly due to the fatigue damage caused by hammering effect. At the same time, abrasive embeddings were found at different impact angles. When the impact angle was low, the hammering effect was small and the reaction force on the particles was small, resulting in a small loss of kinetic energy, and the particles eventually rotated away from the specimen surface at a higher speed. When the impact angle was 45°, the hammer effect increased and the reaction force on the particles increased, and the kinetic energy loss increased, but the final motion state was the same as that at 30°. When the impact angle was 90°, the reaction force and kinetic energy loss of the particles were the largest, and the final particles moved away from the specimen surface along the incident trajectory. When the impact angle was small, the loss of abrasive kinetic energy was small. The loss of abrasive kinetic energy increased with the increase of impact angle. There were broken abrasives embedded in the TC4 substrate at each impact angle. The erosion distance and sand amount on the erosion damage of titanium alloy is significant, and the impact angle affects the erosion mechanism of titanium alloy. The research results can provide a theoretical basis for the design of titanium alloy structural components against erosion.关键词
Ti6Al4V钛合金/固体颗粒冲蚀/正交试验/数值模拟/冲蚀机理Key words
Ti6Al4V titanium alloy/solid particle erosion/orthogonal test/numerical simulation/erosion mechanism分类
矿业与冶金引用本文复制引用
郭华锋,赵恩兰,杨海峰,张万利,李龙海,刘磊,何绍华..TC4钛合金表面固体粒子冲蚀损伤行为及机理研究[J].表面技术,2024,53(13):128-138,11.基金项目
国家自然科学基金(52275224) （52275224）
江苏高校'青蓝工程'资助项目National Natural Science Foundation of China(52275224) （52275224）
Qing Lan Project of Jiangsu Province （）
