Study on surface quality and subsurface damage mechanism of nickel-based single-crystal superalloy in precision turning

作者：Yunguang Zhou, Shuhai Wang, Han Chen, Ji Zou, Lianjie Ma, Guoqiang Yin · 发表于：Journal of Manufacturing Processes · 年份：2023 · DOI：10.1016/j.jmapro.2023.05.053 · 被引用次数：34 · 研究领域：Additive Manufacturing Materials and Processes、Advanced machining processes and optimization、Surface Treatment and Residual Stress

Nickel-based single-crystal superalloy has no grain boundary, which eliminates the weak link of thermal-force coupling deformation at high temperature. Therefore, it has excellent thermal fatigue resistance to become an ideal material for the manufacture of turbine disks in aeroengines using the turning process. However, most of the current research results on turning nickel-based superalloy focus on the field of polycrystalline alloys, from which nickel-based single-crystal superalloy have great structural differences. Hence, it is impossible to directly guide the turning of nickel-based single-crystal superalloy through existing theoretical results of turning nickel-based polycrystalline superalloy to achieve high-efficiency and low-damage turning. In this paper, the turning surface quality and subsurface damage mechanism of single-crystal nickel-based superalloy were studied. Firstly, the effects of cutting velocity v s , feeding rate v w , and turning depth a p on surface roughness and surface topography were investigated separately, and the mechanisms underlying the different laws were analyzed. Secondly, the influence of tool wear on the turning surface morphology was investigated, and the measure to improve the turning surface quality of nickel-based single-crystal superalloy from the aspect of tool wear was put forward. Finally, a transmission electron microscope (TEM) was used to observe and analyze the subsurface microstructure of the subsurface layer to investigate...