The effect of Nb/Ti ratio on hardness in high-strength Ni-based superalloys

Hiromu Hisazawa; Yoshihiro Terada; Fauzan Adziman; David J. Crudden; David M. Collins; David E J Armstrong; Roger C. Reed

doi:10.3390/met7030071

The effect of Nb/Ti ratio on hardness in high-strength Ni-based superalloys

Hiromu Hisazawa^*, Yoshihiro Terada, Fauzan Adziman, David J. Crudden, David M. Collins, David E J Armstrong, Roger C. Reed

^*Corresponding author for this work

Metallurgy and Materials

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

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Abstract

The age-hardening behaviour and microstructure development of high strength Ni-based superalloys ABD-D2, D4, and D6 with varying Nb/Ti ratios have been studied. The studied alloys have large volume fractions and multimodal size distributions of the γ^′ precipitates, making them sensitive to cooling conditions following solution heat treatment. Differential scanning calorimetry was conducted with a thermal cycle that replicated a processing heat treatment. The hardness of these alloys was subsequently evaluated by nanoindentation. The Nb/Ti ratio was not observed to influence the size and distribution of primary and secondary γ^′ precipitates; however, the difference in those of tertiary γ^′ and precipitate morphology were observed. The nanoindentation hardness for all alloys reduces once they have been solution-heat-treated. The alloys exhibited specific peak hardness. The alloy with the greatest Nb content was found to have the best increase in hardness among the alloys studied due to its large tertiary γ^′ precipitate.

Original language	English
Article number	71
Journal	Metals
Volume	7
Issue number	3
Early online date	23 Feb 2017
DOIs	https://doi.org/10.3390/met7030071
Publication status	Published - 1 Mar 2017

Keywords

Age-hardening
Nanoindentation
Nb/Ti ratio
Superalloy

ASJC Scopus subject areas

Materials Science(all)

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title = "The effect of Nb/Ti ratio on hardness in high-strength Ni-based superalloys",

abstract = "The age-hardening behaviour and microstructure development of high strength Ni-based superalloys ABD-D2, D4, and D6 with varying Nb/Ti ratios have been studied. The studied alloys have large volume fractions and multimodal size distributions of the γ′ precipitates, making them sensitive to cooling conditions following solution heat treatment. Differential scanning calorimetry was conducted with a thermal cycle that replicated a processing heat treatment. The hardness of these alloys was subsequently evaluated by nanoindentation. The Nb/Ti ratio was not observed to influence the size and distribution of primary and secondary γ′ precipitates; however, the difference in those of tertiary γ′ and precipitate morphology were observed. The nanoindentation hardness for all alloys reduces once they have been solution-heat-treated. The alloys exhibited specific peak hardness. The alloy with the greatest Nb content was found to have the best increase in hardness among the alloys studied due to its large tertiary γ′ precipitate.",

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AU - Hisazawa, Hiromu

AU - Terada, Yoshihiro

AU - Adziman, Fauzan

AU - Crudden, David J.

AU - Collins, David M.

AU - Armstrong, David E J

AU - Reed, Roger C.

PY - 2017/3/1

Y1 - 2017/3/1

N2 - The age-hardening behaviour and microstructure development of high strength Ni-based superalloys ABD-D2, D4, and D6 with varying Nb/Ti ratios have been studied. The studied alloys have large volume fractions and multimodal size distributions of the γ′ precipitates, making them sensitive to cooling conditions following solution heat treatment. Differential scanning calorimetry was conducted with a thermal cycle that replicated a processing heat treatment. The hardness of these alloys was subsequently evaluated by nanoindentation. The Nb/Ti ratio was not observed to influence the size and distribution of primary and secondary γ′ precipitates; however, the difference in those of tertiary γ′ and precipitate morphology were observed. The nanoindentation hardness for all alloys reduces once they have been solution-heat-treated. The alloys exhibited specific peak hardness. The alloy with the greatest Nb content was found to have the best increase in hardness among the alloys studied due to its large tertiary γ′ precipitate.

AB - The age-hardening behaviour and microstructure development of high strength Ni-based superalloys ABD-D2, D4, and D6 with varying Nb/Ti ratios have been studied. The studied alloys have large volume fractions and multimodal size distributions of the γ′ precipitates, making them sensitive to cooling conditions following solution heat treatment. Differential scanning calorimetry was conducted with a thermal cycle that replicated a processing heat treatment. The hardness of these alloys was subsequently evaluated by nanoindentation. The Nb/Ti ratio was not observed to influence the size and distribution of primary and secondary γ′ precipitates; however, the difference in those of tertiary γ′ and precipitate morphology were observed. The nanoindentation hardness for all alloys reduces once they have been solution-heat-treated. The alloys exhibited specific peak hardness. The alloy with the greatest Nb content was found to have the best increase in hardness among the alloys studied due to its large tertiary γ′ precipitate.

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The effect of Nb/Ti ratio on hardness in high-strength Ni-based superalloys

Abstract

Keywords

ASJC Scopus subject areas

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