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Quantified Relation between Grain Boundary Angle and Interfacial Stability of PWA1484 Superalloy during Thermal Exposure

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Abstract

Nowadays, the tolerance of grain boundaries (GBs) is a crucial subject of single crystal (SX) superalloys. Quantitatively deciphering the effect of GBs on the interfacial stability may provide theoretical guidance for the technological design and engineering application of SX superalloys. In this article, [001] tilt artificial GBs with grain boundary angles (GBAs) of 5, 15, 25, 35, and 45 deg, respectively, have been prepared by directional solidification for PAW1484 SX superalloy. The microstructural evolution at GBs under thermal exposure at 1070 °C up to 1000 hours was quantitatively investigated. It has been revealed that low-angle grain boundaries (LAGBs) (< 15 deg) maintained a straight and narrow interface and have no precipitates (mainly carbides) around GBs. For GBAs higher than 25 deg, however, the γ′ layer was widened and coherent MC carbides with orientation relationships [001]MC//[001]matrix and 〈001〉MC//〈001〉matrix, together with blocky and closely spaced M6C carbides, were precipitated. By carefully scaling, the width of the γ′ layer and the ratio of carbides to the γ′ layer were quantitatively determined as a function of GBAs and thermal exposure time. Furthermore, it has been confirmed that the topological-closed-packed (TCP) phase precipitated along the 45 deg GB with the increase of thermal exposure time.

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Acknowledgments

This work was financially supported by the National Key Research and Development Program of China (Grant No. 2016YFB0701402), Aeronautical Science Foundation of China (Grant No. 2015ZE21006), National Natural Science Foundation of China (Grant No. 51771020) and the Foundation of Science and Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, China (Grant No. 6142903190101).

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Authors and Affiliations

  1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China

    Qinjia Wang & Xidong Hui

  2. Science and Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing, 100095, China

    Qinjia Wang, Jinxia Song, Dinggang Wang & Chengbo Xiao

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  1. Qinjia Wang
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  2. Jinxia Song
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  3. Dinggang Wang
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Correspondence to Jinxia Song or Xidong Hui.

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Manuscript submitted February 18, 2019.

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Wang, Q., Song, J., Wang, D. et al. Quantified Relation between Grain Boundary Angle and Interfacial Stability of PWA1484 Superalloy during Thermal Exposure. Metall Mater Trans A 51, 380–389 (2020). https://doi.org/10.1007/s11661-019-05510-8

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