400℃高周疲勞下TC17超聲沖擊強化表面狀態(tài)演化規(guī)律研究

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關(guān)鍵詞：TC17鈦合金；超聲沖擊強化；表面狀態(tài)；高周疲勞；演化規(guī)律 中圖分類號：V261 DOI：10.3969/j.issn.1004-132X.2025.04.016 開放科學(xué)（資源服務(wù)）標(biāo)識碼（OSID）：

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

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

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