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Effects of Boron and Zirconium on Grain Boundary Morphology and Creep Resistance in Nickel-Based Superalloy

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Abstract

Grain boundaries (GBs) in nickel-based superalloys have a significant influence on the creep resistance of these alloys. In this study, the trace elements of boron and zirconium were added to the newly designed LESS 1 (Ni-22Cr-20Co-2W-2Nb-1.5Al-1.5Ti-0.03C) alloy, and their effects on the GB precipitation behaviors of carbides were observed. The combined addition of boron and zirconium generates a continuous film structure containing MC carbides and M23(C, B)6-type boro-carbides, as well as a grain boundary γ′. Based on the change in microstructure, rupture time is significantly increased. According to the observed microstructures and simulation results, it was confirmed that boron forms M23(C, B)6-type boro-carbides and zirconium appears to stabilize MC carbides at GBs.

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Acknowledgments

This work was supported by the Technology Innovation Program (10052860, Development of Superalloys and Manufacturing Technologies for the Rotor/Casing of the 700 °C grade HSC Steam Turbine), which is funded by the Ministry of Trade, industry, and Energy (MI, Korea).

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Authors and Affiliations

  1. School of Advanced Materials Science and Engineering, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 16419, Republic of Korea

    Byung-Il Kang, Cheon-Ha Han, Yong-Kwan Shin, Jeong-IL Youn & Young-Jig Kim

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  1. Byung-Il Kang
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Kang, BI., Han, CH., Shin, YK. et al. Effects of Boron and Zirconium on Grain Boundary Morphology and Creep Resistance in Nickel-Based Superalloy. J. of Materi Eng and Perform 28, 7025–7035 (2019). https://doi.org/10.1007/s11665-019-04419-y

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  • DOI: https://doi.org/10.1007/s11665-019-04419-y

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