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Ti8LC低成本鈦合金疲勞裂紋擴(kuò)展行為研究
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國(guó)家“973”計(jì)劃（2007CB613807）；新世紀(jì)優(yōu)秀人才支持計(jì)劃（NCET-07-0696）


Study on Fatigue Crack Propagation Behavior of Low Cost Titanium Alloy Ti8LC
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    摘要:

    采用雙重退火對(duì)Ti8LC低成本鈦合金進(jìn)行熱處理，測(cè)試其拉伸性能，并對(duì)其疲勞裂紋擴(kuò)展行為進(jìn)行研究，探索其疲勞斷裂機(jī)制。結(jié)果表明，提高雙重退火的第1次退火溫度，強(qiáng)度略有升高，塑性降低。da/dN試樣斷口3個(gè)區(qū)特征明顯：預(yù)裂區(qū)為解理斷裂機(jī)制。穩(wěn)態(tài)擴(kuò)展區(qū)裂紋以條紋循環(huán)機(jī)制向前擴(kuò)展，同時(shí)能觀察到很多二次裂紋?？焖贁U(kuò)展區(qū)的斷口呈韌窩型斷裂特征。該合金的疲勞裂紋擴(kuò)展速率對(duì)退火溫度不敏感。

    Abstract:

    Low-cost titanium alloy Ti8LC was heat treated by duplex annealing. Its tensile properties were tested, and the fatigue crack propagation behavior as well as fatigue fracture mechanism were studied. Results show that the strength of the alloy increases a little but the ductility decreases with the increase of the first annealing temperature. SEM analysis on the fatigue crack propagation was performed, and the analysis results indicate that the fatigue crack propagates in three modes of three regions. The presplitting region was cleavage fracture. In the stationary state growth region, fatigue crack grew ahead in the form of striation mechanism and many second fatigue cracks were observed in the meantime. In the fast-growth region is mainly dimple. The temperature of duplex annealing has little influence on fatigue crack propagation behavior.

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賈蔚菊,曾衛(wèi)東,段風(fēng)川,王 焱,周義剛. Ti8LC低成本鈦合金疲勞裂紋擴(kuò)展行為研究[J].稀有金屬材料與工程,2009,38(12):2171~2174.[Jia Weiju, Zeng Weidong, Duan Fengchuan, Wang Yan, Zhou Yigang. Study on Fatigue Crack Propagation Behavior of Low Cost Titanium Alloy Ti8LC[J]. Rare Metal Materials and Engineering,2009,38(12):2171~2174.]
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  • 收稿日期:2008-11-20
  • 最后修改日期:2009-09-07
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