南京航空航天大学学报（英文版）2023，Vol.40Issue(5)：511-521,11.DOI:10.16356/j.1005-1120.2023.05.001
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℃
摘要
Abstract
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Key words
broaching machining techniques/fatigue life/nickel-based powder metallurgy superalloy/surface roughness/residual stress/work hardening分类
航空航天引用本文复制引用
张禄,李伟龙,王玉卓,余志伟,江荣,宋迎东..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[J].南京航空航天大学学报（英文版）,2023,40(5):511-521,11.基金项目
This work was supported by the Na-tional Natural Science Foundation of China(No.12250710129),the Natural Science Foundation of Jiangsu Province(No.BK20200450),the China Postdoctoral Sci-ence Foundation(Nos.2023M731823,2020TQ0144),and the Fundamental Research Foundation for the Central Uni-versities(No.NS2022019). （No.12250710129）
