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Ru对一种第四代单晶高温合金γ/γ′相中元素分布及高温蠕变性能的影响
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北京航空材料研究院,北京航空材料研究院,北京航空材料研究院,中国科学院物理研究所;中国科学院物理研究所,北京航空材料研究院,北京航空材料研究院

基金项目:

国家自然科学基金资助项目(59493300);教育部博士点基金资助项目(9800462)


Effect of Ru on Partitioning of Elements in γ/γ′ Phase and High Temperature Creep Properties of a Fourth Ni-based Single Crystal Superalloy
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Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials

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    摘要:

    摘 要: 研究了不同Ru含量（0和2wt.%）的高Re镍基单晶高温合金在1120 ℃/140 MPa条件下的蠕变性能，采用SEM、STEM/TEM以及EDS等方法分析了Ru对合金γ/γ′相组织、合金元素成分分配比、蠕变变形组织和位错形态的影响。结果表明，与无Ru合金相比，含Ru合金γ′尺寸更为细小，γ相通道更窄，γ/γ′两相中对TCP相析出有重要影响的Re、Mo和Cr元素分配更加均匀。Ru通过降低γ′相和γ相通道尺寸，降低γ/γ′界面平均位错间距，抑制蠕变加载过程中TCP相析出，显著提高合金的高温蠕变性能。本文研究结果对认识单晶合金高温蠕变过程中Ru的强化机理方面具有理论指导意义。

    Abstract:

    Abstract: The influence of Ru element on the creep properties under 1120 ℃/140 MPa of high Re Ni-based single crystal superalloys with two levels of Ru (0, 2wt.%) additions was investigated. The γ/γ′ phase, partitioning ratio of alloying elements, deformation microstructures and the morphology of dislocations were studied by SEM, STEM/TEM and EDS. The results indicate that Ru addition results in decreasing the size of γ′ phase, width of γ channel and elemental partitioning ratio of Re，Mo and Cr which are important for the precipitation of TCP phase. Ru addition decreased the size of γ′ phase and width of γ channel, decreased the spacing of γ/γ′ interfacial dislocation networks and inhibited the precipitation of TCP phase in the process of creep loading, finally improving the creep properties of the investigatived alloy significantly. This study would be helpful for the understanding of ruthenium’s role of strengthening mechanism in high temperature creep of Ni-base single crystal superalloys. Key words: single crystal superalloys; Ru; micrstructures; partitioning of elements in γ/γ′ phase; creep properties

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骆宇时,赵云松,杨帅,葛炳辉,张剑,唐定中. Ru对一种第四代单晶高温合金γ/γ′相中元素分布及高温蠕变性能的影响[J].稀有金属材料与工程,2016,45(7):1719~1725.[LUO Yu-shi, ZHAO Yun-song, YANG Shuai, Ge Bing-hui, ZHANG Jian, TANG Ding-zhong. Effect of Ru on Partitioning of Elements in γ/γ′ Phase and High Temperature Creep Properties of a Fourth Ni-based Single Crystal Superalloy[J]. Rare Metal Materials and Engineering,2016,45(7):1719~1725.]
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  • 收稿日期:2016-03-22
  • 最后修改日期:2016-04-29
  • 录用日期:2016-06-29
  • 在线发布日期: 2016-10-09

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