This paper presents a comprehensive investigation of the effects of cutting parameters on the surface integrity of milled γ-TiAl alloys. Surface topography, surface roughness, surface defects, plastic deformation, micro-hardness, chip morphology, and tool wear of the milled γ-TiAl alloys were analyzed. The results indicate that the feed rate had the greatest influence on the surface topography and surface roughness. The value of surface roughness increased with the increase in cutting depth and feed rate. However, with the increase in cutting speed, it initially increased and then decreased. The minimum surface roughness was found to be 0.066 μm. The thickness of the plastic deformation layer and the micro-hardness value increased with the increase in cutting depth and feed rate. Also, they initially increased and then decreased with the increase in cutting speed. The minimum thickness of the plastic deformation layer was 15 μm and the depth of the hardened layer on the processed surface varied between 55 and 70 μm. The chip morphology was closely related to the quality of the processed surface. When the cutting depth and feed rate decreased, the chip morphology was transformed from segmented to nearly smooth. When the cutting depth and feed rate reached a critical point, plastic processing of γ-TiAl was achieved. Compared to brittle deformation, a more favorable processed surface was obtained. Finally, the comparison tests of tool wear were carried out with dry and flood coolant cutting. When the cutting speed reached 120 m/min in dry cutting, the tool life was very poor, and the cutting distance was only 1 m. However, the tool life was generally good when cutting with low cutting speed under the following conditions: v_c = 60 m/min, a_p = 0.1 mm, and f_z = 0.01 mm/tooth. Under these conditions, the cutting distance was 60 m in dry cutting with the tool wear of 0.2 mm and 120 m in flood coolant cutting with the tool wear of 0.1 mm. The tool life in flood coolant operation was better than that of dry operation. The tool life decreased to 30 m when cutting with high cutting speed or feed rate (a_p = 0.25 mm or f_z = 0.025 mm/tooth).

本文对切削参数对铣削γ-TiAl合金表面完整性的影响进行了全面研究。分析了铣削的γ-TiAl合金的表面形貌，表面粗糙度，表面缺陷，塑性变形，显微硬度，切屑形态和刀具磨损。结果表明，进给速度对表面形貌和表面粗糙度影响最大。表面粗糙度的值随着切削深度和进给速度的增加而增加。但是，随着切割速度的提高，它先增加然后减少。发现最小表面粗糙度为0.066μm。塑性变形层的厚度和显微硬度值随着切削深度和进给速度的增加而增加。也，它们最初随着切割速度的增加而增加，然后减少。塑性变形层的最小厚度为15μm，加工表面上的硬化层深度在55至70μm之间变化。切屑的形态与加工表面的质量密切相关。当切削深度和进给速度降低时，切屑形态从分段变为接近平滑。当切削深度和进给速度达到临界点时，即可完成γ-TiAl的塑性加工。与脆性变形相比，获得了更有利的加工表面。最后，通过干切削和溢流切削切削进行了刀具磨损的对比测试。干切削中切削速度达到120 m / min时，刀具寿命很差，切削距离仅为1 m。然而，v _c = 60 m / min，a _p = 0.1 mm，f _z = 0.01 mm /齿。在这些条件下，干式切削时的切削距离为60 m，刀具磨损为0.2 mm，而泛滥冷却液切削时的切削距离为120 m，刀具磨损为0.1 mm。溢流冷却液运行中的工具寿命比干运行时更长。当以高切削速度或高进给速度切削时（a _p = 0.25 mm或f _z = 0.025 mm /齿），刀具寿命降低到30 m 。