TC17合金超高周疲劳裂纹萌生机理
作者简介 刘汉青,男,1991年生,博士
收稿日期: 2016-12-15
网络出版日期: 2017-06-13
基金资助
国家自然科学基金项目No.11372201
Very High Cycle Fatigue Failure Mechanism of TC17 Alloy
1 The authors contributed equally to this work.
Received date: 2016-12-15
Online published: 2017-06-13
Supported by
Supported by National Natural Science Foundation of China (No.11372201)
通过实验研究了2种频率(110 Hz和20 kHz)循环载荷作用下航空发动机叶片材料TC17合金的超高周疲劳失效行为,分析了不同失效形式下的裂纹萌生机理。结果表明,TC17合金在2种实验载荷频率下均存在表面和内部萌生裂纹诱发疲劳失效2种失效形式,表面萌生裂纹诱发的疲劳失效主要是由加工缺陷和循环载荷作用下试样表面滑移处应力集中引起的横向裂纹所致,内部萌生裂纹诱发的疲劳失效是由循环载荷作用下材料初生α相的滑移断裂所致。失效机理的不同使得材料的应力-疲劳寿命(S-N)曲线呈双线性,载荷频率对TC17合金的裂纹萌生形式和萌生机理的影响不显著。建立了基于薄弱取向晶粒区域尺寸的疲劳强度预测模型,模型预测值与实验值吻合较好。
刘汉青 , 何超 , 黄志勇 , 王清远 . TC17合金超高周疲劳裂纹萌生机理[J]. 金属学报, 2017 , 53(9) : 1047 -1054 . DOI: 10.11900/0412.1961.2016.00561
Titanium alloys have been widely used in bearing force components in aeronautical structures, such as blades and beams to withstand the high frequency dynamic loads, which requires an outstanding fatigue resistance performance in very high cycle regime during their service life. In this work, very high cycle fatigue failure property of TC17 alloy used as aircraft engine blade material was studied by ultrasonic fatigue test and electromagnetic resonance fatigue test under 110 Hz and 20 kHz sinusoidal load, and crack initiation mechanism of different failure mode was analyzed. The results showed that, fatigue failure modes of TC17 alloy could be divided into surface induced failure and interior induced failure. Surface induced failure was caused by the machine defect and surface slide trace that triggered by the asymmetric loading. Interior induced failure was caused by slid fracture of primary α phase under asymmetric loading. Fatigue resistance of TC17 alloy was influenced by the fatigue crack initiation mechanism but concerned little about the loading frequency. The variation of the fatigue failure mechanism resulted in the S-N curves presenting bilinear. A fatigue strength predicted model is established based on the parameter of the weak crystal orientation area, which is in good agreement with the fatigue test result.
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