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首页> 外文期刊>Materials Science and Engineering >Effects of Cr content on the microstructure and stress rupture property of a directionally solidified Ni-based superalloy during long-term thermal exposure
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Effects of Cr content on the microstructure and stress rupture property of a directionally solidified Ni-based superalloy during long-term thermal exposure

机译：Cr含量对定向凝固Ni基高温合金长期热暴露的组织和应力断裂性能的影响

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摘要

The effects of Cr addition on the microstructure and stress rupture property during long-term thermal exposure have been investigated in a directionally solidified Ni-based superalloy. The increment of Cr content resulting in the excessive precipitation of σ phase is the principal reason for the catastrophic reduction in the stress rupture properties. The amounts of rounded cuboidal γ′ and its coalescence increase, but the tendency of γ′ alignment decreases with the increment of Cr content, which leads to the reduction of the stress rupture property to some degree. The change of lattice misfit shows a good agreement with the change of γ′ morphology and the tendency of γ′ alignment. The change of γ′ shape is accompanied by the increase of the misfit dislocation density, which causes the rise of γ′ coalescence. The increase of Cr content can promote the formation of M23C6or M6C in the vicinity of degenerating primary MC. Thus, the increased Cr content facilitates the decomposition of primary MC, which deteriorates the stress rupture properties. In addition, the increase of Cr content can promote the formation M23C6and M6C along gain boundaries (GBs), facilitating the formation of a semicontinuous carbide chain to some degree and broadens GBs and thus promoting the crack nucleation at GBs, which plays a certain role in the degradation of the stress rupture properties.
机译：在定向凝固的镍基高温合金中，研究了Cr的添加对长期热暴露过程中的显微组织和应力断裂性能的影响。导致σ相过度析出的Cr含量增加是应力断裂性能发生灾难性降低的主要原因。圆形长方体γ'的数量及其聚结增加，但是随着Cr含量的增加，γ'取向的趋势减小，这导致应力断裂性能有所降低。晶格失配的变化与γ'形貌的变化和γ'排列的趋势表现出良好的一致性。 γ'形状的变化伴随着错配位错密度的增加，这导致了γ'聚结的上升。 Cr含量的增加可促进简并MC附近M23C6或M6C的形成。因此，增加的Cr含量促进初级MC的分解，这劣化了应力断裂性能。另外，Cr含量的增加可促进沿增益边界（GBs）形成M23C6和M6C，在一定程度上促进半连续碳化物链的形成并扩大GBs，从而促进GBs处的裂纹形核，这在一定程度上起到了一定的作用。应力断裂性能的下降。

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  • 来源
    《Materials Science and Engineering》 |2018年第7期|449-460|共12页
  • 作者

    H.W. Zhang; X.Z. Qin; Y.S. Wu; L.Z. Zhou; X.W. Li;

  • 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,Institute of Metal Research, Chinese Academy of Sciences;

    Institute of Metal Research, Chinese Academy of Sciences;

    Institute of Metal Research, Chinese Academy of Sciences;

    Institute of Metal Research, Chinese Academy of Sciences;

    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;

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  • 正文语种 eng
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  • 关键词

    Ni-based superalloy; Cr content, σ phase; γ′ phase; Primary MC carbides; Grain boundary coarsening; Stress rupture property;

    机译：镍基高温合金Cr含量σ相γ′相原生MC碳化物晶界粗化应力断裂性能;

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