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首页> 外文期刊>Materials Science and Engineering >Influence of microstructure and its evolution on the mechanical behavior of modified MAR-M247 fine-grain superalloys at 871 ℃
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Influence of microstructure and its evolution on the mechanical behavior of modified MAR-M247 fine-grain superalloys at 871 ℃

机译：871℃下微结构及其演变对改性MAR-M247细晶粒高温合金力学行为的影响

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摘要

This study added Re to Mar-M247 fine-grain superalloy and investigated the influence of microstructure and its evolution on the mechanical behavior at 871 ℃. Mar-M247 and modified Mar-M247 alloys consisted of dual precipitation of primary and secondary y particles in the γ' matrix. An increase in Re content led to a reduction in the primary γ' phase with the γ' phase becoming finer; however, the addition of Re did not have an obvious influence the secondary γ' phase. Tensile and creep tests (871 ℃/379MPa) showed that both tensile and creep strength increased with an increase in Re content up to a maximum of 3 wt%. In the early creep stage, the addition of Re improved creep resistance by increasing the strength of the γ matrix and decreasing the inter-particle spacing. In the later creep stage, the linear fraction of the y raft in stress axial direction increased following the addition of Re, resulting in improved creep resistance. Observation of microstructure evolution indicated that only secondary y phase coarsened directionally into a rafting structure and the primary y phase was unaffected by creep. An interrupted creep tests verified that the y rafting structure initiated in the primary creep stage and completed in the secondary creep stage. The addition of excessive quantities of Re, such as 5 wt%, resulted in the formation of needle-like P phase, which damaged the tensile and creep properties. During tensile and creep tests, cracks initiated and propagated along grain boundary (GB) in alloys containing 0-3 wt% Re; and propagated along both the GB and P/γ interface in an alloy containing 5 wt% Re. In conclusion, optimal results were obtained for fine-grain Mar-M247 following the addition of 3 wt% Re.
机译：本研究在Mar-M247细晶粒高温合金中添加Re，并研究了显微组织及其演变对871℃力学性能的影响。 Mar-M247和改良的Mar-M247合金由γ'基体中的一次和二次y颗粒双重沉淀组成。 Re含量的增加导致初级γ'相减少，而γ'相变得更细。但是，添加Re对次要γ'相没有明显的影响。拉伸和蠕变试验（871℃/ 379MPa）表明，抗拉强度和蠕变强度均随Re含量的增加而增加，最高可达3 wt％。在蠕变的早期阶段，添加Re可以通过增加γ基体的强度和减小颗粒间的间距来提高抗蠕变性。在随后的蠕变阶段，随着Re的添加，y轴在应力轴向的线性分数增加，从而提高了抗蠕变性。观察到微观结构的演变表明，只有次要y相定向地粗化成漂流结构，而主要y相不受蠕变的影响。中断的蠕变测试验证了y漂流结构是在初级蠕变阶段启动并在次级蠕变阶段完成的。添加过量的Re，例如5wt％，导致形成针状P相，这破坏了拉伸和蠕变性能。在拉伸和蠕变试验中，含0-3 wt％Re的合金中的裂纹沿晶界（GB）发生并扩展。并在含有5 wt％Re的合金中沿GB和P /γ界面传播。总之，加入3 wt％的Re后，对于细颗粒的Mar-M247可获得最佳结果。

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  • 来源
    《Materials Science and Engineering》 |2012年第30期|p.93-100|共8页
  • 作者

    Jian-Hong Liao; Hui-Yun Bor; Chao-Nan Wei; Chuen-Guang Chao; Tzeng-Feng Liu;

  • 作者单位

    Materials and Electro-Optics Research Division, Chung-Shan Institute of Science and Technology, Taoyuan 32599, Taiwan, ROC;

    Materials and Electro-Optics Research Division, Chung-Shan Institute of Science and Technology, Taoyuan 32599, Taiwan, ROC;

    Materials and Electro-Optics Research Division, Chung-Shan Institute of Science and Technology, Taoyuan 32599, Taiwan, ROC;

    Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30049, Taiwan, ROC;

    Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30049, Taiwan, ROC;

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  • 正文语种 eng
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  • 关键词

    fine-grain; nickel based superalloys; casting; rhenium; creep;

    机译：细颗粒镍基高温合金;铸件;铼;爬行;

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