取向;疲勞強(qiáng)度;解理斷裂"/> 取向700和900 ℃溫度條件下光滑和缺口試樣的高溫旋轉(zhuǎn)彎曲高周疲勞性能。結(jié)果表明：<111>取向DD499合金光滑試樣的疲勞強(qiáng)度在700 ℃為355 MPa，在900 ℃時為400 MPa，其疲勞強(qiáng)度和缺口敏感性均隨溫度的升高而增大。<111>取向DD499合金兩種溫度光滑試樣的疲勞斷裂均為多源斷裂，斷裂機(jī)制均表現(xiàn)為沿最密排面{111}面的解理斷裂特征；而缺口試樣在700 ℃表現(xiàn)為沿缺口向中心擴(kuò)展斷裂，900 ℃表現(xiàn)為類似于光滑試樣的斷裂特征。"/>

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<111>取向DD499合金旋轉(zhuǎn)彎曲高周疲勞性能的研究
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Rotary Bending High Cycle Fatigue Behavior of Single Crystal Superalloy DD499 in <111> Orientation
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    研究了DD499單晶高溫合金<111>取向700和900 ℃溫度條件下光滑和缺口試樣的高溫旋轉(zhuǎn)彎曲高周疲勞性能。結(jié)果表明：<111>取向DD499合金光滑試樣的疲勞強(qiáng)度在700 ℃為355 MPa，在900 ℃時為400 MPa，其疲勞強(qiáng)度和缺口敏感性均隨溫度的升高而增大。<111>取向DD499合金兩種溫度光滑試樣的疲勞斷裂均為多源斷裂，斷裂機(jī)制均表現(xiàn)為沿最密排面{111}面的解理斷裂特征；而缺口試樣在700 ℃表現(xiàn)為沿缺口向中心擴(kuò)展斷裂，900 ℃表現(xiàn)為類似于光滑試樣的斷裂特征。

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    Smooth and notched specimens of single crystal superalloy DD499 in <111> orientation were subjected to rotary bending high cycle fatigue loading at temperatures of 700 and 900 oC in ambient atmosphere. The results show that both fatigue strength and notch sensitivity of smooth specimens of <111>-oriented DD499 alloy are increased at elevated temperature; the fatigue strength of smooth specimens are 355 MPa at 700 oC, and 400 MPa at 900 oC. High cycle fatigue failure of smooth specimens of DD499 alloy at different temperatures is in the form of cleavage fracture with multiple crack initiation sites, which was evidently observed along {111} glide plane. However, for the notched specimens, the cracks propagate towards the central area from notched roots at 700 oC, and cleavage rupture characteristics is just like that of the smooth specimens at 900 oC.

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孫岳來,于金江,王振江,孫曉峰,管恒榮,胡壯麒.<111>取向DD499合金旋轉(zhuǎn)彎曲高周疲勞性能的研究[J].稀有金屬材料與工程,2011,40(2):239~242.[Sun Yuelai, Yu Jinjiang, Wang Zhenjiang, Sun Xiaofeng, Guan Hengrong, Hu Zhuangqi. Rotary Bending High Cycle Fatigue Behavior of Single Crystal Superalloy DD499 in <111> Orientation[J]. Rare Metal Materials and Engineering,2011,40(2):239~242.]
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  • 收稿日期:2010-03-01
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