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一种镍基单晶高温合金高周疲劳引起的g′溶解行为研究
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中国科学院金属研究所

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TG146.1

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Dissolution of g′ in a single crystal superalloy after high-cycle fatigue
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Institute of Metal Research,Chinese Academy of Sciences,Shenyang

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    摘要:

    研究了一种镍基单晶高温合金SRR99在不同温度下的高周疲劳行为,试样采用[001]取向的单晶试棒。结果表明条件疲劳强度随着试验温度的升高先上升后降低,具有与高温拉伸强度表现出相同的变化规律。通过扫描电子显微镜和透射电子显微镜的观察发现g′相的形貌发生了显著变化,经过高温循环变形后g′析出相发生了溶解。在交变应力的作用下,g′与基体界面产生大量的位错,而位错的往复运动引起了g′相的溶解。因此循环加载过程中伴随着g′的不断溶解,共格界面的强化作用不断减弱。 除此之外,通过裂纹扩展方向与试样轴向的夹角可以判断出疲劳裂纹的扩展主要沿着(111)晶面进行,根据扫描电镜和透射电镜的观察结果对于循环加载的微观组织演化机理进行了讨论。

    Abstract:

    High-cycle fatigue (HCF) tests at different temperatures were performed on a single crystal superalloy SRR99 with [001] orientation. The results demonstrate that conditional fatigue strength firstly increases and then decreases with the increase of temperature. It exhibits the same tendency with tensile strength at elevated temperatures. The microstructures are observed by SEM and TEM and it is found that the morphology of g′ particles changes significantly and dissolution of g′ particles takes place during cyclic loading. This is likely induced by the back and forth movement of interface dislocations during the cyclic loading. As a result, the strengthening effect from the coherent g/g′ coherent interfaces is gradually deteriorated during high-cycle fatigue deformation. On the other hand, the fatigue crack propagation is found to be primarily along a specific crystalline plane, which is identified as (111). The specific mechanism for the microstructure evolution during cyclic loading is discussed based on SEM and TEM observations.

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刘源,王琳宁,于金江,孙晓峰.一种镍基单晶高温合金高周疲劳引起的g′溶解行为研究[J].稀有金属材料与工程,2020,49(9):2925~2929.[Liu Yuan, Wang Linning, Yu Jinjiang, Sun Xiaofeng. Dissolution of g′ in a single crystal superalloy after high-cycle fatigue[J]. Rare Metal Materials and Engineering,2020,49(9):2925~2929.]
DOI:10.12442/j. issn.1002-185X. E20190092

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  • 收稿日期:2019-07-03
  • 最后修改日期:2019-08-25
  • 录用日期:2019-09-06
  • 在线发布日期: 2020-10-15
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