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Study of Metallic Carbide (MC) in a Ni-Co-Cr-Based Powder Metallurgy Superalloy

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Abstract

The evolution of carbides in a Ni-Cr-Co-based powder metallurgy (PM) superalloy in the as-atomized, as-atomized + annealed, hot isostatic pressed (HIPed) and HIPed + annealed conditions were systematically analyzed to understand the formation of blocky metallic carbide (MC) along the previous particle boundary (PPB). The results show that the carbides both on the powder surfaces and in the bulk of the powder particles are mainly fan-shaped MC whose decomposition temperatures are in the range of 1473 K to 1493 K (1200 °C to 1220 °C). PPB carbides in the HIPed alloy are mainly block-shaped MC, and the fan-shaped MC densely distributed in the area that have not been consumed by the recrystallized grains. The formation mechanism of PPB carbides can be described as follows: When the powders are HIPed at 1453 K (1180 °C), the fan-shaped carbides are decomposed at the migrating boundaries of recrystallized grains, and the preferential precipitation of block-shaped MC at PPB is promoted by the carbide-forming elements released by the fan-shaped carbides. When the HIPed alloy is annealed at 1453 K (1180 °C), the area fraction of PPB carbides increases with an increase in annealing time but that of the fan-shaped carbides exhibits opposite behavior. This proves the above formation mechanism of PPB carbides.

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Acknowledgments

This research is partially funded by the National Basic Research Program of China (Grant No. 2010CB631204), the National Natural Science Foundation of China (Grant No. 51071019), and National High Technology Research and Development Program of China (Grant No. 2013AA031601). The authors would like to thank the Central Iron and Steel Research Institute for support of alloy manufacture and mechanical property testing.

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R China

    Wen-Bin Ma (Student), Guo-Quan Liu (Head of Materials Science Department), Ben-Fu Hu (Professor), Peng-Hui Hu (Student) & Yi-Wen Zhang (Senior Engineer)

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

    Guo-Quan Liu (Head of Materials Science Department)

  3. High Temperature Materials Research Institute, Central Iron and Steel Research Institute, Beijing, 100081, P.R. China

    Yi-Wen Zhang (Senior Engineer)

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  1. Wen-Bin Ma
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  2. Guo-Quan Liu
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Correspondence to Guo-Quan Liu.

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Manuscript submitted March 2, 2013.

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Ma, WB., Liu, GQ., Hu, BF. et al. Study of Metallic Carbide (MC) in a Ni-Co-Cr-Based Powder Metallurgy Superalloy. Metall Mater Trans A 45, 208–217 (2014). https://doi.org/10.1007/s11661-013-1962-x

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