Creep-fatigue behavior at high temperature of a UDIMET 720 nickel-base superalloy
Creep-fatigue behavior at high temperature of a UDIMET 720 nickel-base superalloy
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DOI：
10.1016/j.ijfatigue.2009.07.003
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发表时间：
2010-05-01
影响因子：
6
通讯作者：
Mendez, J.
中科院分区：
文献类型：
--
作者：
Billot, T.;Villechaise, P.;Mendez, J.
研究了变形镍基高温合金Udimet 720的高温疲劳和蠕变疲劳性能。在700摄氏度的空气中，在应力控制下，用三角形信号进行疲劳测试，用梯形信号进行蠕变疲劳测试。蠕变的影响已被研究的故障范围从1到50秒的停留时间。采用透射电镜（TEM）研究了不同保压时间下试样的位错组织。损伤过程的特征在于断裂表面和不同试样的标距长度，使用扫描电子显微镜（SEM）。与疲劳测试条件相比，引入停留时间降低了失效循环次数，并且与蠕变条件相比，还减少了最大应力下的总累积时间。(C)2009爱思唯尔有限公司保留所有权利。
High temperature fatigue and creep-fatigue properties of the wrought nickel-base superalloy Udimet 720 have been investigated. Tests have been performed in air at 700 degrees C under stress control with a triangular signal for fatigue and with a trapezoidal one for creep-fatigue. The creep influence has been studied up to the failure for dwell times ranging from 1 to 50 s. The dislocation microstructures of the failed specimens have been studied by transmission electron microscopy (TEM), in function of increasing dwell time. Damage processes have been characterized on the fracture surface and on the gauge length of the different specimens using scanning electron microscopy (SEM). The introduction of the dwell time lowers the number of cycles to failure as compared to fatigue testing conditions and also reduces the total accumulated time at maximum stress as compared to creep conditions. (C) 2009 Elsevier Ltd. All rights reserved.