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Fatigue Crack Growth Behavior in TC4-DT Titanium alloy with Different Lamellar Microstructures
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Fatigue Crack Growth Behavior in TC4-DT Titanium alloy with Different Lamellar Microstructures
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The “973” Project of China (2007CB613807, 2011CB012805)

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    摘要:

    主要討論了TC4-DT鈦合金不同片層結(jié)構(gòu)的疲勞裂紋擴(kuò)展行為。通過(guò)不同的熱處理工藝獲得不同的組織結(jié)構(gòu)參數(shù)，例如片層寬度和集束尺寸。結(jié)果表明，在保證合金力學(xué)性能的條件下，β相區(qū)空冷獲得的組織具有較好的疲勞性能，主要?dú)w因于片層結(jié)構(gòu)中裂紋尖端存在較大的塑性范圍區(qū)域，并且較寬的α片層和大的集束尺寸有助于提高合金的斷裂韌性和疲勞裂紋擴(kuò)展阻力

    Abstract:

    This paper focused on the fatigue crack growth behavior of TC4-DT titanium alloy with different lamellar microstructures. Heat treatments were performed in order to prepare different microstructures with α lamella width and colony size. The results show that on the premise to guarantee adequate mechanical properties, the microstructures formed through air cooling from the β-phase field present better ability to resist fatigue crack propagation. This is attributed to the existing of bigger plastic deformation field in crack tip. It is also found that wide α lamellae and coarse α colony are beneficial to improve fracture toughness and resistance to fatigue crack propagation

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郭 萍,趙永慶,曾衛(wèi)東. Fatigue Crack Growth Behavior in TC4-DT Titanium alloy with Different Lamellar Microstructures[J].稀有金屬材料與工程,2015,44(2):277~281.[Guo Ping, Zhao Yongqing, Zhao Yongqing. Fatigue Crack Growth Behavior in TC4-DT Titanium alloy with Different Lamellar Microstructures[J]. Rare Metal Materials and Engineering,2015,44(2):277~281.]
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  • 收稿日期:2014-03-25
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  • 在線發(fā)布日期: 2015-05-29
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