Improving fatigue properties of normal direction ultrasonic vibration assisted face grinding Inconel 718 by regulating machined surface integrity

作     者：Nianwei Xu Renke Kang Bi Zhang Yuan Zhang Chenxu Wang Yan Bao Zhigang Dong Nianwei Xu;Renke Kang;Bi Zhang;Yuan Zhang;Chenxu Wang;Yan Bao;Zhigang Dong

作者机构：State Key Laboratory of High-Performance Precision ManufacturingDalian University of TechnologyDalian 116024People’s Republic of China Department of Mechanical and Energy EngineeringSouthern University of Science and TechnologyShenzhen 518055People’s Republic of China 

出 版 物：《International Journal of Extreme Manufacturing》 (极端制造（英文）)

年 卷 期：2024年第6卷第3期

页      面：458-475页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 1010[医学-医学技术（可授医学、理学学位）] 082503[工学-航空宇航制造工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0825[工学-航空宇航科学与技术] 0702[理学-物理学] 1009[医学-特种医学] 080201[工学-机械制造及其自动化] 

基　　金：support from the National Science Fund of China(52325506) the National Science and Technology Major Project(2017-VII-0002-0095) Fundamental Research Funds for the Central Universities(DUT22LAB501) 

主　　题：surface integrity fatigue strength Inconel 718 ultrasonic assisted grinding 

摘      要：Fatigue properties are crucial for critical aero-engine components in extreme serviceenvironments,which are significantly affected by surface integrity(SI)indexes(especially surface topography,residual stressσ_(res),and microhardness)after machining ***-direction ultrasonic vibration-assisted face grinding(ND-UVAFG)has advantages in improving the machinability of Inconel 718,but there is a competitive relationship between higher compressiveσ_(res)and higher surface roughness R_(a)in affecting fatigue *** lack of a quantitative relationship between multiple SI indexes and fatigue strength makes theindeterminacy of a regulatory strategy for improving fatigue *** this work,a model of fatigue strength(σ_f)_(sur)considering multiple SI indexes was ***,high-cycle fatigue tests were carried out on Inconel 718 samples with different SI characteristics,and the influence of ND-UVAFG process parameters on SI was *** on SI indexes data,the(σ_f)_(sur)distribution in the grinding surface layer for ND-UVAFG Inconel 718 samples was determined using the developed model,and then the fatigue crack initiation(FCI)sites were *** predicted FCI sites corresponded well with the experimental results,therebyverifying this model.A strategy for improving the fatigue life was proposed in this work,which was to transfer the fatigue source from the machined surface to the bulk material by controlling the SI ***,a critical condition of SI indexes that FCI sites appeared on the surface or in bulk material was given by fitting the predicted *** to the critical condition,an SI field where FCI sites appeared in the bulk material could be *** this field,thefatigue life of Inconel 718 samples could be improved by approximately 140%.