[1]史栋刚,徐小严,吴雨,等.钛合金保载疲劳的影响因素与研究进展[J].中国材料进展,2019,(07):722-728.[doi:10.7502/j.issn.1674-3962.201905040]
 SHI Donggang,XU Xiaoyan,WU Yu,et al.Influence Factors and Research Progress of Dwell Fatigue for Titanium Alloy[J].MATERIALS CHINA,2019,(07):722-728.[doi:10.7502/j.issn.1674-3962.201905040]
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钛合金保载疲劳的影响因素与研究进展()
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中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
期数:
2019年第07期
页码:
722-728
栏目:
出版日期:
2019-07-31

文章信息/Info

Title:
Influence Factors and Research Progress of Dwell Fatigue for Titanium Alloy
作者:
史栋刚徐小严吴雨齐英诚
(中国航发商用航空发动机有限责任公司设计研发中心,上海 201108)
Author(s):
SHI DonggangXU XiaoyanWU YuQI Yingcheng
(R&D Center, AECC Commercial Aircraft Engine Co., Ltd., Shanghai 201108, China)
关键词:
钛合金寿命评估保载疲劳机理显微组织保载时间
Keywords:
titanium alloy life assessment dwell fatigue mechanism microstructure dwell time
DOI:
10.7502/j.issn.1674-3962.201905040
文献标志码:
A
摘要:
钛合金由于其优异的比强、蠕变及疲劳等综合性能,在航空发动机压气机盘等关键转动件中得到广泛的应用。但近年来的研究发现,采用传统的三角波或正弦波循环疲劳寿命评估方法可能会高估部分钛合金在真实运行条件下的疲劳寿命,引发严重的安全事故。保载疲劳通常表现为低于200 ℃时,在疲劳峰值应力保持加载一段时间,寿命相比传统的循环低周疲劳出现大幅降低。此外,裂纹通常萌生于亚表面,较难在零件服役过程中被有效检测,严重危害航空发动机的安全性和可靠性。综述了近年来国内外在钛合金保载疲劳产生机理,H元素含量、显微组织、加载条件、保载时间等因素影响保载疲劳方面的研究进展,并探讨了钛合金保载疲劳的预防及研究发展方向。
Abstract:
Titanium alloy is widely used in critical rotating components of aero engine such as compressor discs due to its excellent comprehensive properties such as high strength-density ratio, good creep and fatigue properties,etc. However, recent research found that the traditional life assessment method for some titanium alloys by low cycle fatigue test under triangular or sine wave mode is likely to overestimate the fatigue life in real operation condition, which may cause serious accident. Dwell fatigue shows significant lifetime reductions under 200 ℃ with hold periods at the peak stress of the cyclic loading compared to standard continuous low cycle fatigue. Moreover, crack usually initiates from the subsurface, which is hard to be detected during service and severely detrimental to the fly safety and reliability. This paper introduces both domestic and foreign researches on mechanism of titanium dwell fatigue, influences of hydrogen content, microstructure, load condition and dwell time on the behavior of dwell fatigue. Then a preventive action with future development is discussed.

备注/Memo

备注/Memo:
第一作者:史栋刚,男,1985年生,工程师,Email:sdonggang@163.com
更新日期/Last Update: 2019-08-09