TC4钛合金复合加载下超高周疲劳性能研究

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摘要针对航空发动机压气机叶片在实际工况下的超高周疲劳断裂问题，研究了三种锻造温度下TC4钛合金三点弯曲–轴向拉伸复合加载的疲劳破坏行为。试验结果表明，S-N曲线呈直线下降型和双平台型，采用985 ℃近锻造时疲劳性能最好。随着应力幅值降低，裂纹由表面萌生向次表面萌生转变，断口形貌呈现准解理断裂特征。表面裂纹萌生于α晶界或α-β相界，由位错滑移堆积导致；而次表面裂纹萌生于刻面，由初生α相解理导致。疲劳寿命由裂纹萌生阶段主导，且所占比例随总寿命的增加而变大。双态组织中初生α含量和尺寸均小于等轴组织，且β转变组织含量更高，从而具备更好的疲劳性能。轴向拉伸改变了试件的轴向应力分布，有利于提高裂纹萌生于次表面的概率，使裂纹起源点向内部迁移。
关键词：TC4钛合金；复合加载；超高周疲劳；S-N曲线；微观组织

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	王博涵1
	程礼1
	2
	李冬春1

关键词 ： TC4钛合金, 复合加载, 超高周疲劳, S-N曲线, 微观组织

Abstract：Aiming at the fatigue fracture problem of aero-engine compressor blades under actual working conditions, the fatigue failure behavior of TC4 titanium alloy at three forging temperatures under three-point bending-axial tensile composite loading was studied. The test results show that the S-N curve is linear decline type and double platform type, and the fatigue performance is the best when forging at 985 ℃. With the decrease of stress amplitude, the crack changes from surface initiation to subsurface initiation, and the fracture morphology shows the characteristics of quasi-cleavage fracture. The surface crack originates at the α grain boundary or α-β phase boundary, which is caused by the slip and accumulation of dislocations, while the subsurface crack originates in the facet and is caused by the cleavage of the primary α phase. The fatigue life is dominated by the crack initiation stage, and the proportion increases with the increase of the total life. The content and size of primary α in the bimodal microstructure are smaller than that in the equiaxed microstructure, and the content of β transformation microstructure is higher, so it has better fatigue properties.The axial tension changes the axial stress distribution of the specimen, which is beneficial to increase the probability of crack initiation on the subsurface and make the crack origin point migrate to the interior.
Key words: TC4 titanium alloy; composite loading; very high cycle fatigue; S-N curve; microstructure

Key words： TC4 titanium alloy composite loading very high cycle fatigue S-N curve microstructure

收稿日期: 2021-07-27 出版日期: 2022-10-28

引用本文:

王博涵1，程礼1,2，李冬春1. TC4钛合金复合加载下超高周疲劳性能研究[J]. 振动与冲击, 2022, 41(20): 244-251.
WANG Bohan1, CHENG Li1,2, LI Dongchun1. A study on very high cycle fatigue properties of TC4 titanium alloy under combined loading. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(20): 244-251.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I20/244

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