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On the Role of Grain Boundary Serration in Simulated Weld Heat-Affected Zone Liquation of a Wrought Nickel-Based Superalloy

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Abstract

The effects of grain boundary serration on boron segregation and liquation cracking behavior in a simulated weld heat-affected zone (HAZ) of a wrought nickel-based superalloy 263 have been investigated. The serrated grain boundaries formed by the developed heat treatment were highly resistant to boron segregation; the serrated sample contained 41.6 pct grain boundaries resistant to boron enrichment as compared with 14.6 pct in the unserrated sample. During weld thermal cycle simulation, liquated grain boundaries enriched with boron were observed at the peak temperature higher than 1333 K (1060 °C) in both unserrated and serrated samples; however, serrated grain boundaries exhibited a higher resistance to liquation. The primary cause of liquation in this alloy was associated with the segregation of the melting point depressing element boron at grain boundaries. The hot ductility testing result indicated that the serrated grain boundaries showed a lower susceptibility to liquation cracking; the grain boundary serration led to an approximate 15 K decrease in the brittle temperature range. These results reflect closely a significant decrease in interfacial energy as well as a grain boundary configuration change by the serration.

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Acknowledgments

The authors are grateful for the financial support from MKE (Ministry of Knowledge Economy), Account No. UCN215-2848.C and 615-2848.C, which made this work possible. The authors also would like to thank Dr. Hong at KBSI, Busan for his sincere assistance with the nano-SIMS analysis.

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Authors and Affiliations

  1. High Temperature Materials Research Group, Korea Institute of Materials Science, 797 Changwondaero Sungsan-gu, Changwon, Gyeongnam, 641-831, Republic of Korea

    Hyun Uk Hong (Senior Researcher), In Soo Kim (Principal Researcher), Baig Gyu Choi (Principal Researcher), Young Soo Yoo (Principal Researcher) & Chang Yong Jo (Principal Researcher)

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  1. Hyun Uk Hong
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  2. In Soo Kim
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  3. Baig Gyu Choi
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  4. Young Soo Yoo
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Correspondence to Hyun Uk Hong.

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Manuscript submitted March 18, 2011.

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Hong, H.U., Kim, I.S., Choi, B.G. et al. On the Role of Grain Boundary Serration in Simulated Weld Heat-Affected Zone Liquation of a Wrought Nickel-Based Superalloy. Metall Mater Trans A 43, 173–181 (2012). https://doi.org/10.1007/s11661-011-0837-2

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