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Microstructure evolution during heat treatment of superalloys loaded with different amounts of carbon

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Abstract

The effects of heat treatment for recovering microstructure of a Ni-based single crystal superalloy with carbon addition have been evaluated. The heat treatment resulted in increased levels of chemical homogeneity. All the samples experienced more γ′ coarsening than as-cast samples. Significant changes to as-cast carbide morphologies were observed. Script-type, MC carbide networks transformed during heat treatment to smaller, spherical Ta-rich MC carbides. Heat treatment caused significant MC carbide decomposition and formation of Cr-rich secondary carbides on or near to decomposed carbides in all modifications. The size of carbides after heat treatment was less than that of cast alloy obviously, and the distribution of carbides became more and more dispersion than in cast alloy.

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ACKNOWLEDGMENTS

This work was jointly supported by the National Natural Science Foundation of China (51201130, 51171151, and 51331005), the National Basic Research Program of China (2011CB610406), National High Technology Research and Development Program (2012AA03A511), and the Key Innovation Team of Shaanxi Province (2014KCT-04).

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Authors and Affiliations

  1. Material Science and Engineering Department, Xi’an University of Science and Technology, Xi’an, 710054, People’s Republic of China

    Zhuhuan Yu & Junfeng Qiang

  2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, People’s Republic of China

    Jun Zhang & Lin Liu

Authors
  1. Zhuhuan Yu
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  2. Junfeng Qiang
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  3. Jun Zhang
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  4. Lin Liu
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Correspondence to Zhuhuan Yu.

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Yu, Z., Qiang, J., Zhang, J. et al. Microstructure evolution during heat treatment of superalloys loaded with different amounts of carbon. Journal of Materials Research 30, 2064–2072 (2015). https://doi.org/10.1557/jmr.2015.127

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  • DOI: https://doi.org/10.1557/jmr.2015.127

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