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Surface recrystallization of a single crystal nickel-base superalloy

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Abstract

The recrystallization behavior of a single crystal nickel-base superalloy was investigated by shot peening and subsequent annealing. Two kinds of recrystallization microstructures, which are intensively dependent on the annealing temperature, are shown in the nickel-base superalloy after shot peening and subsequent annealing. Surface recrystallized grains are obtained when the superalloy is annealed at solution treatment temperature. The nucleation of recrystallization originates from the dendritic core, where rapid dissolution of γ′ particles occurs. Cellular recrystallization is observed after annealing at lower temperatures. Cellular structures induced by high diffusivity of the moving boundary and more γ′ particles dissolution led by residual stress are developed from the surface region. Recrystallized kinetics of the shot-peened alloy annealed at 1050°C accords with the Johnson-Mehl-Avrami-Kolmogorov equation. The low Avrami exponent is caused by the inhomogeneous distribution of stored energy, the decreasing of stored energy during recovery, and the strong resistance of boundary migration by γ′ particles.

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Authors and Affiliations

  1. Department of Superalloys, Institutes of Metal Research, Chinese Academy of Sciences, Shenyang Beijing, 110016, China

    Jie Meng, Tao Jin, Xiao-feng Sun & Zhuang-qi Hu

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

    Tao Jin

Authors
  1. Jie Meng
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  2. Tao Jin
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  3. Xiao-feng Sun
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  4. Zhuang-qi Hu
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Correspondence to Tao Jin.

Additional information

This work was financially supported by the Major State Basic Research and Development Program of China (No.2010CB631206), the National Natural Science Foundation of China (No.50931004), and the Foundation of State Key Lab for Advanced Metals and Materials (No.2008zd-07).

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Meng, J., Jin, T., Sun, Xf. et al. Surface recrystallization of a single crystal nickel-base superalloy. Int J Miner Metall Mater 18, 197–202 (2011). https://doi.org/10.1007/s12613-011-0422-0

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  • DOI: https://doi.org/10.1007/s12613-011-0422-0

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