400℃高周疲劳下TC17超声冲击强化表面状态演化规律研究

打开文本图片集

关键词：TC17钛合金；超声冲击强化；表面状态；高周疲劳；演化规律 中图分类号：V261 DOI：10.3969/j.issn.1004-132X.2025.04.016 开放科学（资源服务）标识码（OSID）：

Investigation on Evolution Laws for Surface States of TC17 Alloy Induced by UIT during High-cycle Fatigue at 400∘C （204号

TAN Liang1，2*FAN Yi3 YAO Changfeng1.2 1.Key Laboratory of High Performance Manufacturing for Aero Engine，Ministry of Industry and Information Technology，Northwestern Polytechnical University，Xi'an，710072 2.Engineering Research Center of Advanced Manufacturing Technology for Aero Engine， Ministry of Education，Northwestern Polytechnical University，Xi'an，710072 3.Shaanxi Aikespu Electromechanical Technology Co.，Ltd.，Xi'an，710061

Abstract： Based on UIT experiments， surface state measurement and tension-tension high cycle fatigue tests at 400∘C ，the evolution laws of surface roughness， surface morphology，residual stress， microhardness，and microstructure of TC17 alloy were investigated. Results show that，compared with the surface states of the UIT processed specimen，after 1h heating treatment at 400°C ，the value of surface roughness Ra increases from 0.46μm to 0.67μm ，the surface microhardness decreases from to 450HV0.025 ，the surface compressive residual stress decreases from -640MPa to -525MPa ，the maximum value of compressive residual stress decreases from -1088MPa to -776 （20 MPa ，and the depth of plastic deformation layer decreases from 20μm to 13μm . After fatigue failure of the specimen at 400∘C ， the value of surface roughness Ra is as 1.22μm ， the depth of compressive residual stress layer is as 70μm ，the depth of plastic deformation layer is as 9μm ，and the subsurface equiaxed α phase transforms into elongated strips，the average grain area increases from 11.8μm2 to 34μm2 ：

Key words： TC17 titanium alloy; ultrasonic impact treatment（UIT）； surface state; high-cycle fatigue;evolution law

0 引言

航空发动机是国之重器，体现了国家的科技水平和综合实力。（剩余19185字）