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钛合金是一种典型难磨削加工材料,磨削表面易出现烧伤、裂纹等热损伤。本文开展了TC4-DT钛合金磨削实验,通过扫描电镜(SEM)、能谱(EDS)、X射线衍射(XRD)、显微硬度仪、金相显微镜及球-盘摩擦磨损实验仪研究了其表面特性及摩擦磨损性能。结果表明:低速磨削表面质量好,摩擦磨损性能较基体略提高;当砂轮线速度为80 m/s时,磨削表面质量良好,摩擦系数为0.38,较基体降低40%;而砂轮线速度为100 m/s时,磨削表面出现严重烧伤、网状裂纹。因此选择合理的高速磨削工艺可避免烧伤、裂纹等热损伤缺陷,并可有效改善表面摩擦磨损性能;磨削表面干摩擦磨损机制为磨粒磨损、粘着磨损和剥层磨损。
Titanium alloy is a typical hard grinding material, grinding surface prone to burn, crack and other thermal damage. In this paper, TC4-DT titanium alloy grinding experiments were carried out. The effects of TC4-DT on the wear resistance of TC4-DT titanium alloy were studied by SEM, EDS, XRD, Its surface properties and friction and wear properties. The results show that the surface quality of the low speed grinding is good and the friction and wear properties are slightly higher than that of the matrix. When the linear velocity of the grinding wheel is 80 m / s, the grinding surface is of good quality with a friction coefficient of 0.38 and a 40% At 100 m / s, severe burns and reticular cracks appear on the ground surface. Therefore, selecting a reasonable high-speed grinding process can avoid the thermal damage defects such as burns and cracks and can effectively improve the surface friction and wear properties. The wear mechanism of the abrasive surface is abrasive wear, adhesive wear and peeling abrasion.