Microstructural characterisation and high-temperature oxidation of laser powder bed fusion processed Inconel 625

E.R. Lewis; Mary Taylor; B. Attard; N. Cruchley; A.P.C. Morrison; M.M. Attallah; S. Cruchley

doi:10.1016/j.matlet.2021.131582

Microstructural characterisation and high-temperature oxidation of laser powder bed fusion processed Inconel 625

E.R. Lewis, Mary Taylor, B. Attard, N. Cruchley, A.P.C. Morrison, M.M. Attallah, S. Cruchley

Metallurgy and Materials

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Abstract

Oxidation of Laser Powder Bed Fused (L-PBF) IN625 was studied in the as-built and heat-treated conditions. Following heat treatment, recrystallisation was observed with a large fraction of twin grain boundaries, and Nb-rich carbides decorated grain boundaries. Samples of L-PBF IN625 were exposed at 950 °C in laboratory air and pressure for up to 504 h. An external chromia scale was formed, alongside a near-continuous δ-phase layer at the scale/alloy boundary. The kinetics of oxidation were similar to wrought IN625, but more closely followed cubic behaviour. It is suggested that the cubic behaviour was caused by the formation of the δ-phase layer.

Original language	English
Article number	131582
Number of pages	4
Journal	Materials Letters
Volume	311
Early online date	24 Dec 2021
DOIs	https://doi.org/10.1016/j.matlet.2021.131582
Publication status	Published - Mar 2022

Keywords

Additive manufacturing
Microstructure
Oxidation

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title = "Microstructural characterisation and high-temperature oxidation of laser powder bed fusion processed Inconel 625",

abstract = "Oxidation of Laser Powder Bed Fused (L-PBF) IN625 was studied in the as-built and heat-treated conditions. Following heat treatment, recrystallisation was observed with a large fraction of twin grain boundaries, and Nb-rich carbides decorated grain boundaries. Samples of L-PBF IN625 were exposed at 950 °C in laboratory air and pressure for up to 504 h. An external chromia scale was formed, alongside a near-continuous δ-phase layer at the scale/alloy boundary. The kinetics of oxidation were similar to wrought IN625, but more closely followed cubic behaviour. It is suggested that the cubic behaviour was caused by the formation of the δ-phase layer.",

keywords = "Additive manufacturing, Microstructure, Oxidation",

author = "E.R. Lewis and Mary Taylor and B. Attard and N. Cruchley and A.P.C. Morrison and M.M. Attallah and S. Cruchley",

year = "2022",

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doi = "10.1016/j.matlet.2021.131582",

language = "English",

volume = "311",

journal = "Materials Letters",

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T1 - Microstructural characterisation and high-temperature oxidation of laser powder bed fusion processed Inconel 625

AU - Lewis, E.R.

AU - Taylor, Mary

AU - Attard, B.

AU - Cruchley, N.

AU - Morrison, A.P.C.

AU - Attallah, M.M.

AU - Cruchley, S.

PY - 2022/3

Y1 - 2022/3

N2 - Oxidation of Laser Powder Bed Fused (L-PBF) IN625 was studied in the as-built and heat-treated conditions. Following heat treatment, recrystallisation was observed with a large fraction of twin grain boundaries, and Nb-rich carbides decorated grain boundaries. Samples of L-PBF IN625 were exposed at 950 °C in laboratory air and pressure for up to 504 h. An external chromia scale was formed, alongside a near-continuous δ-phase layer at the scale/alloy boundary. The kinetics of oxidation were similar to wrought IN625, but more closely followed cubic behaviour. It is suggested that the cubic behaviour was caused by the formation of the δ-phase layer.

AB - Oxidation of Laser Powder Bed Fused (L-PBF) IN625 was studied in the as-built and heat-treated conditions. Following heat treatment, recrystallisation was observed with a large fraction of twin grain boundaries, and Nb-rich carbides decorated grain boundaries. Samples of L-PBF IN625 were exposed at 950 °C in laboratory air and pressure for up to 504 h. An external chromia scale was formed, alongside a near-continuous δ-phase layer at the scale/alloy boundary. The kinetics of oxidation were similar to wrought IN625, but more closely followed cubic behaviour. It is suggested that the cubic behaviour was caused by the formation of the δ-phase layer.

KW - Additive manufacturing

KW - Microstructure

KW - Oxidation

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U2 - 10.1016/j.matlet.2021.131582

DO - 10.1016/j.matlet.2021.131582

M3 - Article

SN - 0167-577X

VL - 311

JO - Materials Letters

JF - Materials Letters

M1 - 131582

ER -

Microstructural characterisation and high-temperature oxidation of laser powder bed fusion processed Inconel 625

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