Microstructure and properties of direct-aged Alloy 625

M. G. Burke; W. J. Mills; R. Bajaj

doi:10.7449/2001/superalloys_2001_389_398

Microstructure and properties of direct-aged Alloy 625

M. G. Burke, W. J. Mills, R. Bajaj

Research output: Contribution to conference › Paper › peer-review

12 Scopus citations

Abstract

The properties and microstructure of Alloy 625 are highly sensitive to heat treatment. This alloy is generally used in an annealed condition, although Alloy 625 is a precipitation-hardenable material. To increase the strength, aging treatments are used to promote precipitation of fine disc-like DO₂₂-ordered γ″ precipitates throughout the γ matrix. The formation of these strengthening precipitates can also be accompanied by the precipitation of intergranular carbides and Ni₃Nb (δ) precipitates. The presence of these phases (carbides and δ) has been reported to negatively affect the behavior of Alloy 625. In the direct aged (DA) condition, Alloy 625 possesses high strength, high ductility and good corrosion resistance. This paper presents the results of a microstructural characterization study using optical microscopy, scanning electron microscopy, analytical electron microscopy (including STEM-EDS microanalysis) and Auger electron spectroscopy. The mechanical and environmental cracking properties of DA-A625 are also described.

Original language	English
Pages	389-398
Number of pages	10
DOIs	https://doi.org/10.7449/2001/superalloys_2001_389_398
State	Published - 2001
Externally published	Yes
Event	SUPERALLOYS 718, 625, 706 and Various Derivatives - Pittsburgh, PA, United States Duration: Jun 17 2001 → Jun 20 2001

Conference

Conference	SUPERALLOYS 718, 625, 706 and Various Derivatives
Country/Territory	United States
City	Pittsburgh, PA
Period	06/17/01 → 06/20/01

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10.7449/2001/superalloys_2001_389_398

Cite this

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title = "Microstructure and properties of direct-aged Alloy 625",

abstract = "The properties and microstructure of Alloy 625 are highly sensitive to heat treatment. This alloy is generally used in an annealed condition, although Alloy 625 is a precipitation-hardenable material. To increase the strength, aging treatments are used to promote precipitation of fine disc-like DO22-ordered γ″ precipitates throughout the γ matrix. The formation of these strengthening precipitates can also be accompanied by the precipitation of intergranular carbides and Ni3Nb (δ) precipitates. The presence of these phases (carbides and δ) has been reported to negatively affect the behavior of Alloy 625. In the direct aged (DA) condition, Alloy 625 possesses high strength, high ductility and good corrosion resistance. This paper presents the results of a microstructural characterization study using optical microscopy, scanning electron microscopy, analytical electron microscopy (including STEM-EDS microanalysis) and Auger electron spectroscopy. The mechanical and environmental cracking properties of DA-A625 are also described.",

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T1 - Microstructure and properties of direct-aged Alloy 625

AU - Burke, M. G.

AU - Mills, W. J.

AU - Bajaj, R.

PY - 2001

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N2 - The properties and microstructure of Alloy 625 are highly sensitive to heat treatment. This alloy is generally used in an annealed condition, although Alloy 625 is a precipitation-hardenable material. To increase the strength, aging treatments are used to promote precipitation of fine disc-like DO22-ordered γ″ precipitates throughout the γ matrix. The formation of these strengthening precipitates can also be accompanied by the precipitation of intergranular carbides and Ni3Nb (δ) precipitates. The presence of these phases (carbides and δ) has been reported to negatively affect the behavior of Alloy 625. In the direct aged (DA) condition, Alloy 625 possesses high strength, high ductility and good corrosion resistance. This paper presents the results of a microstructural characterization study using optical microscopy, scanning electron microscopy, analytical electron microscopy (including STEM-EDS microanalysis) and Auger electron spectroscopy. The mechanical and environmental cracking properties of DA-A625 are also described.

AB - The properties and microstructure of Alloy 625 are highly sensitive to heat treatment. This alloy is generally used in an annealed condition, although Alloy 625 is a precipitation-hardenable material. To increase the strength, aging treatments are used to promote precipitation of fine disc-like DO22-ordered γ″ precipitates throughout the γ matrix. The formation of these strengthening precipitates can also be accompanied by the precipitation of intergranular carbides and Ni3Nb (δ) precipitates. The presence of these phases (carbides and δ) has been reported to negatively affect the behavior of Alloy 625. In the direct aged (DA) condition, Alloy 625 possesses high strength, high ductility and good corrosion resistance. This paper presents the results of a microstructural characterization study using optical microscopy, scanning electron microscopy, analytical electron microscopy (including STEM-EDS microanalysis) and Auger electron spectroscopy. The mechanical and environmental cracking properties of DA-A625 are also described.

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Microstructure and properties of direct-aged Alloy 625

Abstract

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