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镍基单晶高温合金低周疲劳裂纹萌生行为研究
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中国航发北京航空材料研究院

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National Science and Technology Major Project (J2019-VI-0022-0138)


Investigation on low cycle fatigue crack initiation behavior of nickel based single crystal superalloy
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AECC Beijing Institute of Aeronautical Materials

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National Science and Technology Major Project (J2019-VI-0022-0138)

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    摘要:

    对镍基单晶高温合金在530 °C的低周疲劳裂纹萌生行为进行研究。结果表明:在530 °C,应变比0.05时,疲劳裂纹的萌生行为与最大应变的变化关系密切。在最大应变为2.0%时,疲劳裂纹在试样表面的驻留滑移带位置萌生,且萌生平面位于{111}滑移面,萌生位置未见缺陷。当最大应变低于1.6%时,裂纹萌生于试样亚表面或内部的铸造疏松位置,且铸造疏松位于垂直轴向力的{100}滑移面。裂纹沿{100}滑移面萌生后经小阶段扩展后再沿不同{111}滑移面进行扩展。随最大应变减小,裂纹萌生位置逐渐由表面向内部转变。裂纹萌生区存在沿断口表面向内部延伸的二次裂纹,且二次裂纹附近存在明显应力集中。在裂纹萌生区的断口表面附近位错密度较高,存在大量位错切入γ"相。断口表面存在50-100nm的氧化层,Ni、Co元素主要向表面氧化层偏析。

    Abstract:

    Low cycle fatigue crack initiation behavior of nickel based single crystal superalloy at 530 °C have been investigated. The behavior of crack initiation is closely related to the maximum strain. When the maximum strain is 2.0%, the fatigue crack is originated at the position of persistent slip bands on the surface of specimen, where is located at the {111} slip plane. No defects are observed at the crack initiation position. When the maximum strain is lower than 1.6%, the cracks are initiated in the casting defects at subsurface or internal of the specimen. The casting defects is located in the {100} slip plane of the vertical axial force. The crack was initiated along the {100} slip plane and then expanded along different {111} slip plane after a short stage of expansion. As the maximum strain decreases, the position of crack initiation gradually changes from the surface to the interior. Moreover, the secondary cracks extending inward along the fracture surface in the crack initiation area, and there is obvious stress concentration near the secondary crack. The dislocation density is high near the fracture surface in the crack initiation zone, where existed a lot of dislocations cut into the γ" phase. An oxide layer of approximately 50 to 100nm was presented on the fracture surface, and Ni and Co elements are mainly segregated into the oxide layer of the surface.

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张金刚,刘新灵,陈星,李振,李乐宇,刘昌奎.镍基单晶高温合金低周疲劳裂纹萌生行为研究[J].稀有金属材料与工程,,().[zhangjingang, Liuxinling, chenxing, lizhen, lileyu, liuchangkui. Investigation on low cycle fatigue crack initiation behavior of nickel based single crystal superalloy[J]. Rare Metal Materials and Engineering,,().]
DOI:10.12442/j. issn.1002-185X.20230834

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  • 收稿日期:2023-12-25
  • 最后修改日期:2024-01-28
  • 录用日期:2024-02-02
  • 在线发布日期: 2024-03-22
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