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The Effect of Long-Term Thermal Exposure on the Microstructure and Stress Rupture Property of a Directionally Solidified Ni-Based Superalloy

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Abstract

Microstructural degradation and microstructure-property relationship during long-term thermal exposure in a directionally solidified Ni-based superalloy are systematically studied. The coarsening kinetics of γ′ precipitation conforms well to the LSW model during the long-term thermal exposure. The detailed time dependence of MC decomposition during the long-term thermal exposure is revealed. Grain boundary coarsening was mainly facilitated by γ′ and M23C6 precipitates coarsening in GBs region, and the GB coarsening kinetics conforms well to the JMAK theory. During different stages of the thermal exposure, dominant factors for the decrease of stress-rupture lifetime vary due to the evolution of multiple microstructures (γ′ coarsening, MC decomposition, and grain boundary coarsening).

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Acknowledgments

Present work were supported by the National “863” Project 2012AA03A511, 2012AA03A513, the National Basic Research Program (973 Program) of China under Grant No. 2010CB631201 and the National Natural Science Foundation of China under Grant No. 51101160, 51171193. The authors are grateful for these supports.

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Authors and Affiliations

  1. Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, P.R. China

    X. W. Jiang (Ph.D. Candidate), D. Wang (Assistant Researcher), G. Xie (Associate Researcher), H. Li (Professor), L. H. Lou (Professor) & J. Zhang (Professor)

  2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, P.R. China

    J. Zhang (Professor)

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  1. X. W. Jiang
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  2. D. Wang
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  3. G. Xie
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  4. H. Li
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  5. L. H. Lou
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  6. J. Zhang
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Correspondence to D. Wang.

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Manuscript submitted March 4, 2014.

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Jiang, X.W., Wang, D., Xie, G. et al. The Effect of Long-Term Thermal Exposure on the Microstructure and Stress Rupture Property of a Directionally Solidified Ni-Based Superalloy. Metall Mater Trans A 45, 6016–6026 (2014). https://doi.org/10.1007/s11661-014-2559-8

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