Investigation of the stress rupture behavior of GTD-111 superalloy melted by VIM/VAR

Ainaz Agh; Alireza Amini

doi:10.1007/s12613-018-1654-z

Volume 25 Issue 9

Sep. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(9): 1035-1041

Ainaz Agh and Alireza Amini, Investigation of the stress rupture behavior of GTD-111 superalloy melted by VIM/VAR, Int. J. Miner. Metall. Mater., 25(2018), No. 9, pp. 1035-1041. https://doi.org/10.1007/s12613-018-1654-z

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Ainaz Agh and Alireza Amini, Investigation of the stress rupture behavior of GTD-111 superalloy melted by VIM/VAR, Int. J. Miner. Metall. Mater., 25(2018), No. 9, pp. 1035-1041. https://doi.org/10.1007/s12613-018-1654-z

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Research Article

Investigation of the stress rupture behavior of GTD-111 superalloy melted by VIM/VAR

Ainaz Agh and
Alireza Amini

+ Author Affiliations

Corresponding author:
Ainaz Agh E-mail: ainazwhite@gmail.com
Received: 14 January 2017; Revised: 8 May 2018; Accepted: 10 May 2018

Abstract

Abstract

The effects of vacuum induction melting (VIM) and vacuum arc remelting (VAR) processes on the microstructure and stress rupture properties of Ni-based GTD-111 superalloy were investigated. Samples of GTD-111 master alloy were melted in VIM and VAR furnaces and then poured into a preheated ceramic mold for VIM melt or into a water-cooled copper mold for VAR melt. The as-cast samples were examined radiographically to ensure that no casting defects were present in the final castings; the samples were then heat-treated using a standard heat-treatment cycle. The microstructure of the samples was investigated using optical microscopy and scanning electron microscopy in conjunction with energy-dispersive X-ray spectroscopy for microanalysis. On the basis of standard ASTM-E139, stress rupture tests were carried out at 1000℃ under a stress of 300 MPa. The results showed that a γ matrix, fine γ' precipitates, a γ-γ' eutectic structure, carbide particles, and some harmful phases such as σ and η phases were present in the as-cast samples. The γ' precipitates with cubic morphology appeared in the matrix after the standard heat-treatment process. The extent of segregation and the amount of γ-γ' eutectic structure formed in the VAR-prepared sample were less than in the VIM-prepared sample. The results of stress rupture tests showed that the rupture time for the VAR sample was 43% longer than that for the VIM sample.
- GTD-111;
- vacuum induction melting (VIM);
- vacuum arc remelting (VAR);
- stress rupture

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References

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