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殘余應力對涂覆WC-17Co涂層的Ni718合金彎曲疲勞壽命的影響
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中國民航大學理學院,中國民航大學理學院,中國民航大學理學院

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Central University Basic Scientific Research Operation Cost Special Fund (ZXB2011A005)


Effect of residual stress on bending fatigue behaviors of Inconel 718 coated with WC-17Co
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Civil Aviation University of China，College of Science,Civil Aviation University of China，College of Science,Civil Aviation University of China，College of Science

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    摘要:

    利用超音速火焰噴涂技術在Ni718合金表面制備WC-17Co涂層，對噴涂后的試樣進行150℃? h 和300℃? h 保溫熱處理，利用Almen試片曲率法計算不同熱處理條件下涂層中的殘余應力，利用反復彎曲試驗測試試樣的疲勞壽命，分析殘余應力對試樣疲勞壽命的影響。結果表明在疲勞循環(huán)過程中，裂紋在涂層中萌生并向涂層/基體界面處擴展，最后擴展至基體內(nèi)部形成最終斷裂。涂層中的殘余壓應力能夠抑制疲勞裂紋的產(chǎn)生和擴展。當經(jīng)過保溫處理后涂層中的殘余壓應力降低，導致試樣的疲勞壽命隨熱處理的溫度上升而下降。

    Abstract:

    An Inconel 718 alloy was coated by WC-17Co using a high-velocity oxygen fuel (HVOF) thermal spray process. The residual stress of WC-17Co coating under different heat-treatment conditions was investigated. The effect of residual stress on bending fatigue life of the coated alloy was discussed. It was found that fatigue cracks were initiated at the WC-17Co coating and propagated to the alloy substrate. The compressive residual stress generated during HVOF process could restrict the initiation and propagation of cracks. The absolute value of the compressive residual stress in WC-17Co coating decreased after annealing treatment, resulting in a lower fatigue life of the coated specimens.

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丁坤英,郭亞飛,鄒慧.殘余應力對涂覆WC-17Co涂層的Ni718合金彎曲疲勞壽命的影響[J].稀有金屬材料與工程,2017,46(2):307~311.[Ding Kunying, Guo Yafei, Zou Hui. Effect of residual stress on bending fatigue behaviors of Inconel 718 coated with WC-17Co[J]. Rare Metal Materials and Engineering,2017,46(2):307~311.]
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  • 收稿日期:2014-10-28
  • 最后修改日期:2014-12-21
  • 錄用日期:2015-01-13
  • 在線發(fā)布日期: 2017-04-10
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