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Effects of Hf and B on high temperature low stress creep behavior of a second generation Ni-based single crystal superalloy DD11

机译：Hf和B对第二代Ni基单晶高温合金DD11的高温低应力蠕变行为的影响

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摘要

The as-cast and heat-treated microstructures and high temperature creep properties have been investigated in four experimental Ni-based single crystal superalloys containing various levels of Hf addition (0-0.4 wt%) and B addition (0-0.02 wt%). The experimental results indicated that the creep rupture life showed an improvement with individual addition of Hf, but it was decreased with individual addition of B. The elemental partitioning ratio and interfacial dislocation spacing of γ/γ' were obviously changed with individual Hf or B additions. Meanwhile, the formation of secondary phases, such as the blocky NIC carbide, script-like shape M_3B_2 phases, was observed in the creep samples, which was also closely related to the high temperature creep behaviors. The high volume fraction of residual (γ+γ') eutectics was mainly attributed to the significant decrease of creep rupture life for the present experimental alloy containing both Hf and B additions. This study is helpful to better understand Hf and B's role of strengthening mechanism and to optimize Hf and B additions in single crystal superalloys.
机译：在四种含不同水平的Hf添加量（0-0.4 wt％）和B添加量（0-0.02 wt％）的实验镍基单晶高温合金中，研究了铸态和热处理后的显微组织以及高温蠕变性能。实验结果表明，单独添加Hf，蠕变断裂寿命有所改善，但单独添加B，则蠕变断裂寿命降低。单独添加Hf或B，元素的分配比和界面错位间距明显改变。同时，在蠕变样品中观察到了第二相的形成，例如块状NIC碳化物，脚本状的M_3B_2相，这也与高温蠕变行为密切相关。残余（γ+γ'）共晶的高体积分数主要归因于同时添加Hf和B的本实验合金的蠕变断裂寿命显着降低。这项研究有助于更好地了解Hf和B在强化机制中的作用，并优化Hf和B在单晶高温合金中的添加。

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  • 来源
    《Materials Science and Engineering》 |2016年第30期|143-152|共10页
  • 作者

    Y.S. Zhao; J. Zhang; Y.S. Luo; J. Li; D.Z. Tang;

  • 作者单位

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China,Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China;

    Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China;

    Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China,NCS Testing Technology Co., Ltd., Beijing 100081 China;

    Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China;

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  • 正文语种 eng
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  • 关键词

    Superalloys; Hafnium and boron; Elemental partitioning ratio; Secondary phases; High temperature creep properties;

    机译：高温合金;and和硼;元素分配比;第二阶段;高温蠕变性能;

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