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高載荷條件下TC17鈦合金低周疲勞和保載疲勞損傷行為研究
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西北有色金屬研究院

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陜西省重點(diǎn)研發(fā)一般項(xiàng)目(2019GY-162)


Fracture behavior of low cycle fatigue and dwell fatigue ofTC17 titanium alloy under high load
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1.Northwest Institute for Nonferrous Metal Research,Xi’an 710016;2.China

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    摘要:

    研究了高應(yīng)力水平下不同加載波形對TC17鈦合金疲勞損傷的影響,結(jié)果表明,對于在峰值應(yīng)力處保載120S的加載波形,TC17鈦合金的保載疲勞壽命低于無保載加載波形試驗(yàn)的壽命,在相同的保載疲勞條件下,片層組織的保載疲勞敏感性較等軸組織的疲勞敏感性低。斷口分析表明,保載疲勞試樣裂紋源出現(xiàn)在樣品表面和亞表面處,常規(guī)疲勞試樣裂紋源出現(xiàn)在試樣表面處,保載疲勞斷口較常規(guī)疲勞斷口附近小平面平坦,保載條件并未從根本上改變斷裂模式。

    Abstract:

    Effect of different loading waveform on fatigue damage of TC17 titanium alloy under the high stress level is researched. The results show that the dwell fatigue life is lower than low cycle fatigue life for TC17 titanium alloy under the peak stress and the dwell loading for 120s. Under the condition of the same high load dwell fatigue, the fatigue sensitivity of lamellar organization is lower than that of the equiaxed structure. Fracture analysis shows that the crack source of dwell fatigue appeared on the surface and sub-surface of the sample, while that of low cycle fatigue appeared on the surface of the sample. The fracture surface of dwell fatigue was flatter than that of the conventional low cycle fatigue, and the fracture mode did not change fundamentally under the dwell loading condition.

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郭萍,潘浩,賈國玉,侯紅苗.高載荷條件下TC17鈦合金低周疲勞和保載疲勞損傷行為研究[J].稀有金屬材料與工程,2022,51(1):301~305.[Guo Ping, Pan Hao, Jia Guoyu, Hou Hongmiao. Fracture behavior of low cycle fatigue and dwell fatigue ofTC17 titanium alloy under high load[J]. Rare Metal Materials and Engineering,2022,51(1):301~305.]
DOI：10.12442/j. issn.1002-185X.20210059

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歷史
  • 收稿日期:2021-01-20
  • 最后修改日期:2021-03-16
  • 錄用日期:2021-04-16
  • 在線發(fā)布日期: 2022-02-09
  • 出版日期: 2022-01-28