Effect of Long-Term Aging on Microstructural Restoration in Cast Nickel Base Superalloy, GTD-111

Chuleeporn Paa-Rai; J. Norachan; Panyawat Wangyao; Sureerat Polsilapa; Gobboon Lothongkum

doi:10.4028/www.scientific.net/MSF.891.426

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HomeMaterials Science ForumMaterials Science Forum Vol. 891Effect of Long-Term Aging on Microstructural...

Effect of Long-Term Aging on Microstructural Restoration in Cast Nickel Base Superalloy, GTD-111

Abstract:

In this research study, the effect of long-term aging after various solutioning temperatures on final microstructure was investigated. The cast nickel base superalloy, GTD-111, usually has standard reheat treatment as follows: solutioning treatment at 1448 - 1478 K for 7.2 ‑ 21.6 ks and aging at 1118 K for 86.4 ks. However, from previous research works, the density of γ՛ phase was not reached the optimum value. Therefore, extension of aging time was performed in the study from 90 to 180, 270, 360, 720, 1080 and 1440 ks in order to increase density or volume fraction of precipitating γ՛ particles. From the results, it was found that longer aging time provided higher values of both area fraction and size of γ՛ particles. However, increase in aging time resulted in the hardness decrease.

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Periodical:

Materials Science Forum (Volume 891)

Pages:

426-432

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.891.426

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Online since:

March 2017

Authors:

Chuleeporn Paa-Rai, J. Norachan, Panyawat Wangyao*, Sureerat Polsilapa, Gobboon Lothongkum

Keywords:

Lifetime Extension, Microstructural Refurbishment, Reheat Treatment, Rejuvenation, Superalloy

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