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首页> 外文期刊>Materials Science and Engineering >Effect of minor additions on the microstructures and stress rupture properties of a directionally solidified Ni-based superalloy
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Effect of minor additions on the microstructures and stress rupture properties of a directionally solidified Ni-based superalloy

机译：少量添加对定向凝固Ni基高温合金的组织和应力断裂性能的影响

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摘要

The effects of C, Zr and Y/Ce on the microstructures and stress rupture properties of a directionally solidified Ni-based superalloys were investigated. The morphology of MC carbides does not change in as-cast alloys, as the C content is increased or the Zr is added. However, the Y/Ce additions promote the transformation of MC carbide morphology from blocky to script-like type. Compared with that in as-cast alloys, there is no obvious change in the morphologies of MC carbide or chemical compositions after heat treatment. The increasing of C content and the addition of Zr or Y/Ce significantly decreases and increases the amount of the γ/γ' eutectic, respectively. After a solid solution treatment and subsequently a two-stage aging treatment, the γ' phase is characteristic with two kinds of shapes and sizes, and the volume fraction of cuboidal γ' phase is much larger than that of spherical γ' phases. More MC carbide and residual eutectic result from the decreasing of cuboidal γ' phase volume fraction. The decrease in volume fraction of cuboidal γ' phase is principally responsible for the reduction of the stress rupture property. In addition, script-like carbide and residual eutectic remaining after heat treatment play the secondary role in the degradation of the stress rupture properties. The less regularly arranged cuboidal γ' phase can damage the stress rupture life to some extent. The spherical γ' phase re-dissolves into γ' matrix widening the spacing between large cuboidal γ' phase, and the addition of Zr inhibits grain boundary sliding and cracking; these two facts are beneficial to the rupture elongation.
机译：研究了C，Zr和Y / Ce对定向凝固Ni基高温合金的组织和应力断裂性能的影响。在铸造合金中，MC碳化物的形态不会发生变化，因为C含量增加或Zr添加。然而，Y / Ce的添加促进了MC碳化物形态从块状到类似脚本的转变。与铸态合金相比，热处理后MC碳化物的形态或化学成分没有明显变化。 C含量的增加和Zr或Y / Ce的添加分别显着降低和增加了γ/γ'共晶的量。在固溶处理和随后的两阶段时效处理之后，γ'相具有两种形状和尺寸特征，长方体γ'相的体积分数比球形γ'相的体积分数大得多。立方立方γ'相体积分数的减少导致更多的MC碳化物和残余的共晶。长方体γ'相体积分数的减少主要是造成应力断裂性能下降的原因。另外，热处理后残留的脚本状碳化物和残留的共晶在应力断裂性能的降低中起次要作用。排列不规则的长方体γ'相会在一定程度上破坏应力断裂寿命。球形γ'相重新溶解在γ'基质中，扩大了大长方体γ'相之间的间距，并且Zr的添加抑制了晶界的滑动和开裂；这两个事实有利于断裂伸长。

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  • 来源
    《Materials Science and Engineering》 |2018年第10期|303-312|共10页
  • 作者

    H.W. Zhang; X.Z. Qin; X.W. Li; L.Z. Zhou;

  • 作者单位

    Department of Materials Physics and Chemistry, School of Materials Science and Engineering, and Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, PR China,Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, PR China;

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, PR China;

    Department of Materials Physics and Chemistry, School of Materials Science and Engineering, and Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, PR China;

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, PR China;

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  • 正文语种 eng
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  • 关键词

    Ni-based superalloy; Minor addition; Microstructure; MC carbide; Eutectic; Stress rupture;

    机译：镍基高温合金;少量添加;微观结构MC碳化物;共晶;应力破裂;

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