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Investigations on servicing damage mechanisms of Cr35Ni45Nb alloy under complex conditions

机译：复杂条件下Cr35Ni45Nb合金的维修损伤机理研究

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摘要

The damage induced by oxidation and stress during the service process of Cr35Ni45Nb alloy and their influences on the microstructure evolution and creep rupture life of this alloy were studied. Continuity, compactness, and high temperature stability of the oxide layers are conductive to the performance of the alloy. A slight but complete layer of oxidation on surface improves the creep rupture life of the specimens. However, being exposed to long-term oxidation is observed to be counter-productive. Temperature stress generated during the air-cooling process creates large carbides near the surface of the specimen's cracks. Moreover, tiny carbides are precipitated from γ matrix and interfacial defects due to creep stress, but strip carbides are dissolved due to creep stress and the Gibbs-Thomson effect.
机译：研究了Cr35Ni45Nb合金在使用过程中氧化和应力引起的损伤及其对这种合金的组织演变和蠕变断裂寿命的影响。氧化物层的连续性，致密性和高温稳定性有助于合金的性能。表面略微但完整的氧化层可改善样品的蠕变断裂寿命。然而，观察到长期氧化会适得其反。空气冷却过程中产生的温度应力会在试样裂纹表面附近产生大量碳化物。此外，由于蠕变应力，微小的碳化物会从γ基体和界面缺陷中析出，但由于蠕变应力和Gibbs-Thomson效应，带状碳化物会溶解。

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  • 来源
    《Journal of Materials Research》 |2016年第14期|2156-2163|共8页
  • 作者

    Jiangchu Xiao; Maicang Zhang;

  • 作者单位

    School of Material science and engineering, University of Science & Technology Beijing, Beijing 100083, China;

    School of Material science and engineering, University of Science & Technology Beijing, Beijing 100083, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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