TC17合金超高周疲劳裂纹萌生机理

doi:10.11900/0412.1961.2016.00561

金属学报

2017, Vol. 53

Issue (9): 1047-1054 DOI: 10.11900/0412.1961.2016.00561

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TC17合金超高周疲劳裂纹萌生机理

刘汉青¹, 何超², 黄志勇¹(

), 王清远^1,²

1四川大学空天科学与工程学院成都 610065
2成都大学建筑与土木工程学院成都 610106

Very High Cycle Fatigue Failure Mechanism of TC17 Alloy

Hanqing LIU¹, Chao HE², Zhiyong HUANG¹(

), Qingyuan WANG^1,²

1 School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China
2 School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China

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摘要:

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。

关键词 ： TC17合金, 超高周疲劳, 失效机理, 滑移断裂

Abstract：

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.

Key words： TC17 alloy very high cycle fatigue fatigue failure mechanism slip fracture

收稿日期: 2016-12-15 出版日期: 2017-06-13

O346.2

基金资助:国家自然科学基金项目No.11372201

作者简介:

作者简介刘汉青,男,1991年生,博士

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引用本文:

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.
Hanqing LIU, Chao HE, Zhiyong HUANG, Qingyuan WANG. Very High Cycle Fatigue Failure Mechanism of TC17 Alloy. Acta Metall, 2017, 53(9): 1047-1054.

链接本文:

http://www.ams.org.cn/CN/10.11900/0412.1961.2016.00561 或 http://www.ams.org.cn/CN/Y2017/V53/I9/1047

图1 疲劳试样几何尺寸参数

图2 热处理后TC17合金的显微组织SEM像

图3 TC17合金疲劳试样最小横截面处沿半径从表面至中心的显微硬度

图4 TC17合金在110 Hz和20 kHz频率正弦式循环载荷作用下的疲劳寿命实验结果

图5 2种载荷频率下TC17合金表面萌生裂纹诱发失效试样断口形貌的SEM像

图6 2种载荷频率下TC17合金内部萌生裂纹诱发失效试样断口形貌的SEM像

图7 TC17合金试样表面滑移线及横向裂纹

图8 滑移线对局部应力分布的影响示意图[19]

图9 TC17合金试样表面萌生裂纹形貌

图10 TC17合金试样裂纹萌生区小平面形貌

图11 内部萌生裂纹萌生区侧视图

图12 TC17合金疲劳寿命与萌生区形貌的关系

图13 裂纹萌生区面积与萌生深度的关系

图14 疲劳强度预测值与实验值之间的相对误差

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