铣削工艺参数对镍基粉末高温合金650℃低周疲劳寿命的影响  

Effect of Broaching Machining Parameters on Low Cycle Fatigue Life of Ni⁃Based Powder Metallurgy Superalloy at 650℃

作　　者：张禄 李伟龙 王玉卓 余志伟 江荣 宋迎东[1,2,3] ZHANG Lu;LI Weilong;WANG Yuzhuo;YU Zhiwei;JIANG Rong;SONG Yingdong(Key Laboratory of Aero-engine Thermal Environment and Structure,Ministry of Industry and Information Technology,College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,P.R.China;Jiangsu Province Key Laboratory of Aerospace Power System,College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,P.R.China;State Key Laboratory of Mechanics and Control Mechanical Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,P.R.China)

机构地区：[1]南京航空航天大学能源与动力学院,工业和信息化部航空发动机热环境与热结构重点实验室,中国南京210016 [2]南京航空航天大学能源与动力学院,江苏省航空动力系统重点实验室,中国南京210016 [3]南京航空航天大学机械结构力学及控制国家重点实验室,中国南京210016

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2023年第5期511-521,共11页南京航空航天大学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.12250710129);the Natural Science Foundation of Jiangsu Province(No.BK20200450);the China Postdoctoral Science Foundation(Nos.2023M731823,2020TQ0144);the Fundamental Research Foundation for the Central Universities(No.NS2022019)。

摘　　要：研究了不同铣削工艺对疲劳损伤的影响规律。对采用4种工艺加工的试样进行了650℃高温空气环境下的低周疲劳试验。分别采用粗糙度表征方法、背向散射电子衍射技术和纳米压痕测试以获得试样的表面粗糙度、残余应力和加工硬化。测试结果表明,采用电火花线切割方法加工的试样疲劳寿命最高(平均80360循环),有最低的表面粗糙度(0.226)和残余应力;而钝刀具加工的试样疲劳寿命最低(平均43978循环),相较于电火花线切割试样的疲劳寿命下降了45%。扫描电镜表征结果表明,疲劳裂纹主要由粗大的非再结晶晶粒和加工缺陷引发。铣削加工方法和参数对疲劳损伤程度和疲劳寿命有重要影响。Effects of different broaching machining techniques on fatigue damages are studied.Low cycle fatigue tests at high temperature 650℃in air environment are carried out for specimens with four processing techniques.The roughness characterization method,electron backscatter diffraction(EBSD)and nanoindentation test are used to obtain the surface roughness,residual stress and work hardening,respectively.The wire cut electrical discharge machining(WEDM)specimens exhibit the highest fatigue life of average 80360 cycle with the lowest surface roughness of 0.226 and residual stress,while specimens machined by blunt tool suffer the lowest fatigue life of average 43978 cycle,decreasing 45%compared to WEDM ones.SEM results show that fatigue cracks are mainly initiated from the coarse non-recrystallized grains and machining defects.The broaching machining methods and parameters have significant influences on the level of fatigue damages and fatigue lives.

关 键 词：铣削工艺 疲劳寿命 镍基粉末高温合金 表面粗糙度 残余应力 加工硬化 

分 类 号：V216.3[航空宇航科学与技术—航空宇航推进理论与工程]