Lai Xunqing, Wang Yuannan, Wang Dan, Zhao Guolong, Yang Yinfei
College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China.
Nanjing Mindray Biomedical Electronics Co., Ltd., Nanjing 210019, China.
Materials (Basel). 2023 Nov 15;16(22):7180. doi: 10.3390/ma16227180.
Titanium alloy parts are more and more widely used in the field of aerospace. In order to improve the service life of titanium alloy parts, the response surface method was used to study surface residual stress and roughness under different turning parameters. In addition, a mathematical model was established through multiple linear regression to determine the relationship between surface integrity parameters and fatigue life. The test results indicate that the turning parameters have an effect on surface residual stress in the order of feed rate > depth of cut > cutting speed and on surface roughness in the order of feed rate > cutting speed > depth of cut. The analysis results of surface integrity show that the residual compressive stress on the surface has the greatest impact on fatigue life, followed by surface roughness. The fatigue life increases with the increase in residual compressive stress and decreases linearly with the increase in surface roughness. The feed rate has a significant impact on residual stress and surface roughness. Therefore, under the experimental conditions of this paper, the appropriate feed rate can be selected to ensure that the Ra < 2 μm and a large residual compressive stress is obtained.
钛合金零件在航空航天领域的应用越来越广泛。为提高钛合金零件的使用寿命，采用响应面法研究了不同车削参数下的表面残余应力和粗糙度。此外，通过多元线性回归建立了数学模型，以确定表面完整性参数与疲劳寿命之间的关系。试验结果表明，车削参数对表面残余应力的影响顺序为进给量＞切削深度＞切削速度，对表面粗糙度的影响顺序为进给量＞切削速度＞切削深度。表面完整性分析结果表明，表面残余压应力对疲劳寿命的影响最大，其次是表面粗糙度。疲劳寿命随残余压应力的增加而增加，随表面粗糙度的增加而线性降低。进给量对残余应力和表面粗糙度有显著影响。因此，在本文的试验条件下，可选择合适的进给量，以确保Ra＜2μm并获得较大的残余压应力。
