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Microtensile creep testing of freestanding MCrAlY bond coats

机译：独立式MCrAlY粘结层的微拉伸蠕变测试

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摘要

Bond coats are essential in gas turbine technology for oxidation protection. Freestanding MCrAlY ( M = Ni, Co) bond coats were investigated with respect to their creep strength at elevated temperatures. Three types of MCrAlY, a Ni- based bond coat Amdry 386, a Co- based bond coat Amdry 9954 and Amdry 9954 + 2 wt% Al2O3 ( ODS = oxide dispersion strengthened) produced by low pressure plasma spraying, were analyzed. The two phase microstructure of the bond coats consists of a fcc c- Ni solid solution and a B2 b- NiAl phase. Constant load experiments were performed in a thermomechanical analyzer at temperatures between 900 and 950 degrees C. Microtensile test specimens with a diameter of 450 lm were produced by a high- precision grinding and polishing process. Creep rupture was mainly due to void nucleation along the b- c interfaces and grain boundaries. The time to failure is larger in Ni- based Amdry 386 compared to that in Co- based Amdry 9954 due to a higher fraction of the high- strength b- NiAl phase at test temperatures. The addition of ODS- particles in the Co- based bond coat Amdry 9954 resulted in a better creep resistance but lower ductility in comparison to ODSparticle- free Amdry 9954.
机译：粘结涂层在燃气轮机技术中对氧化保护至关重要。研究了独立式MCrAlY（M = Ni，Co）粘结涂层在高温下的蠕变强度。分析了三种类型的MCrAlY：通过低压等离子喷涂生产的Ni基粘结涂层Amdry 386，Co基粘结涂层Amdry 9954和Amdry 9954 + 2 wt％Al2O3（ODS =增强了氧化物分散性）。粘结层的两相微观结构由fcc c-Ni固溶体和B2b-NiAl相组成。在热机械分析仪中于900到950摄氏度之间的温度下进行恒载荷实验。通过高精度的研磨和抛光工艺生产了直径为450 lm的微拉伸试样。蠕变破裂主要是由于沿b-c界面和晶界的空核形核。与基于钴的Amdry 9954相比，基于镍的Amdry 386的失效时间更长，这是因为在测试温度下高强度的b-NiAl相的比例更高。与不含ODS颗粒的Amdry 9954相比，在Co基粘结涂层Amdry 9954中添加ODS-颗粒具有更好的抗蠕变性，但延展性较低。

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  • 来源
    《Journal of Materials Research》 |2019年第15期|2643-2652|共10页
  • 作者

    Giese Sven; Neumeier Steffen; Amberger-Matschkal Doris; Bergholz Jan; Vassen Robert; Goeken Mathias;

  • 作者单位

    Friedrich Alexander Univ Erlangen Nurnberg FAU, Mat Sci Engn, Inst 1, D-91058 Erlangen, Germany;

    Friedrich Alexander Univ Erlangen Nurnberg FAU, Mat Sci Engn, Inst 1, D-91058 Erlangen, Germany;

    Friedrich Alexander Univ Erlangen Nurnberg FAU, Mat Sci Engn, Inst 1, D-91058 Erlangen, Germany;

    Forschungszentrum Julich, IEK 1 Mat Synth & Proc, Inst Energy & Climate Res, D-52425 Julich, Germany;

    Forschungszentrum Julich, IEK 1 Mat Synth & Proc, Inst Energy & Climate Res, D-52425 Julich, Germany;

    Friedrich Alexander Univ Erlangen Nurnberg FAU, Mat Sci Engn, Inst 1, D-91058 Erlangen, Germany;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    MCrAlY; creep; bond coat; small scale testing;

    机译：Mcraly;蠕变;粘合涂层;小规模测试;

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