Surface integrity characterization of thirdgeneration nickel-based single crystal blade tenons after ultrasonic vibration-assisted grinding  

作　　者：Biao ZHAO Hexu YOU Qing MIAO Wenfeng DING Ning QIAN Jiuhua XU 

机构地区：[1]National Key Laboratory of Science and Technology on Helicopter Transmission,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [2]College of Mechanical Engineering,Suzhou University of Science and Technology,Suzhou 215009,China

出　　处：《Chinese Journal of Aeronautics》2025年第1期235-253,共19页中国航空学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(Nos.92160301,92060203,52175415,52205475,and 52322510);the Science Center for Gas Turbine Project(No.P2023-B-IV-003-001);the Huaqiao University Engineering Research Center of Brittle Materials Machining(No.2023IME-001);the Natural Science Foundation of Jiangsu Province(No.BK20210295).

摘　　要：Machined surface integrity of workpieces in harsh environments has a remarkable influence on their performance.However,the complexity of the new type of machining hinders a comprehensive understanding of machined surface integrity and its formation mechanism,thereby limiting the study of component performance.With increasing demands for high-quality machined workpieces in aerospace industry applications,researchers from academia and industry are increasingly focusing on post-machining surface characterization.The profile grinding test was conducted on a novel single-crystal superalloy to simulate the formation of blade tenons,and the obtained tenons were characterized for surface integrity elements under various operating conditions.Results revealed that ultrasonic vibration-assisted grinding(UVAG)led to multiple superpositions of abrasive grain trajectories,causing reduced surface roughness(an average reduction of approximately29.6%)compared with conventional grinding.After examining the subsurface layer of UVAG using transmission electron microscopy,the results revealed that the single-crystal tenon grinding subsurface layer exhibited a gradient evolution from the near-surface to the substrate.This evolution was characterized by an equiaxed nanocrystalline layer measuring 0.34μm,followed by a submicrocrystalline grain-forming zone spanning 0.6μm and finally,a constituent phase-twisted dis-torted deformation zone over 0.62μm.Under normal grinding conditions,the tenon exhibited low surface hardening(not exceeding 15%),and residual compressive stresses were observed on its surface.In cases where grinding burns occurred,a white layer appeared on the tenon's surface,which demonstrated varying thicknesses along the teeth from top to root due to thermal-force-structural coupling effects.Additionally,these burns introduced residual tensile stresses on the tenon's surface,potentially substantially affecting its fatigue life.This paper enhances our understanding of UVAG processes and establishes a foundation for their

关 键 词：Single-crystal blade tenon Seeded gel abrasives Ultrasonic vibration-assisted profile grinding Surface integrity 

分 类 号：V261.25[航空宇航科学与技术—航空宇航制造工程]