HE Jinrui LU Younian WANG Qingsui SU Hansheng ZHANG Xueduo WU Mingchang ZHU Qiao Beijing Institute of Aeronautical Materials
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Beijing
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China P.O.No.81—23
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Beijing 100095
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China
金属学报(英文版)
The time-dependent fatigue and its micromechanism of superalloy GH169 at 650℃ have been studied.Under the same stress and duration,its cyclic life in Ar is shorter than that in air.The damage mechanism is mainly of the interaction between high temperature oxidation and fa- tigue.The fracture surface of GH169 specimen oxidized at 650℃ in air is revealed to be cov- ered with a dense and even oxide film,but in Ar,with uncontinuous oxide particles.As the time prolonged,the Cr_2O_3 content in the surface oxides increases in air and decreases in Ar.
关键词:
superalloy GH169
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null
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null
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DONG Jianxin XIE Wei~* XU Zhichao XIE Xishan ZHANG Shouhua University of Science and Technology Beijing
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Beijing
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China doctorate student P.O.Box 604
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University of Science and Technology Beijing
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Beijing 100083
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China
金属学报(英文版)
Micro-alloying of Mg,ranged from 30 to 70 ppm,may improve the high temperature ductility,stress rupture,especially,certain important mechanical properties,such as cyclic stress rupture,creep/fatigue interaction and crack propagation rate.The quantity, morphology and distribution of δ-phase may obviously influence the notched cyclic stress rup- ture life.The relevant microstructure shows that the Mg may also influence to certain extent on the feature of δ-phase.Thus,to keep the Mg and δ-phase under control may further im- prove the mechanical properties of alloy GH169.
关键词:
superalloy GH169
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null
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null
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null
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null
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TIAN Changsheng WANG Minsheng HOU Tiecui DANG Xin'an Northwestern Polytechnical University.Xi'an
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China Associate Professor
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Department of Materials Science and Engineering
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Northwestern Polytechnical University
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Xi'an 710072
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China
金属学报(英文版)
In Situ observation of deformation and fracture for superalloy GH169 under combined fatigue-creep action is made by using high temperature metalloscope,it is shown that under the test conditions the deformution takes place by merely of slipping,twinning and grain houndary sliding,and the mode of failure depends on the microstructure of specimen. lntergranular cracks arise.from W-type voids produced by the stress concentration at triple point which could not be relaxed by the interior deformation of grains and the local deformathm region along grain bounaries.And the crack propagation mechanism is the nucleation,growth and linkage of carities at the grain boundaries.Transgranular cracks form from deformatiom damages within the grain,and its propagation mechanism is shear rupture along the slip phme.
关键词:
combined fatigue-creep action
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null
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null
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何晋瑞
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吕又年
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王庆绥
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苏翰生
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张学铎
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吴明昌
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朱峭
金属学报
本文研究了高温合金GH169 650℃下时间相关疲劳中氧化作用及其微观机制。试验表明,在相同应力和保持时间下,氩气中的循环寿命均低于大气中的循环寿命,损伤机制主要是高温氧化-疲劳交互作用。在高温大气中的断口表面覆盖有致密而均匀的氧化膜;而在高温氩气中的断口表面则为不连续氧化物质点。
关键词:
高温合金GH169
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time-dependent fatigue
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oxidation effect
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creep-fatigue-environment interation
董建新
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谢蔚
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徐志超
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谢锡善
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章守华
金属学报
研究了微量元素Mg及δ相对GH169(INCONEL718)高温合金力学性能的影响结果表明,Mg含量从30ppm提高到70ppm,合金可以在保持高强度下进一步改善塑性,特别可提高在使用条件下的一些重要力学性能;δ相的数量、形态及分布明显影响合金的缺口周期持久寿命相应的组织观察表明,Mg在一定程度上也影响δ相的?些特性,因此通过控制Mg含量可控制δ相的数量,形态及分布特征,从而进一步提高GH169合金的力学性能
关键词:
GH169高温合金
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mechanical property
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δ-phase
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Mg
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creep and fatigue interaction
