The nucleation and growth of η phase in nickel-based superalloy during long-term thermal exposure

Liu, Gang; Xiao, Xueshan; Véron, Muriel; Birosca, Soran

doi:10.1016/j.actamat.2019.12.038

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The nucleation and growth of η phase in nickel-based superalloy during long-term thermal exposure

Gang Liu, Xueshan Xiao, Muriel Véron, Soran Birosca

Acta Materialia, Volume: 185, Pages: 493 - 506

Swansea University Author: Soran Birosca

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DOI (Published version): 10.1016/j.actamat.2019.12.038

Abstract

The microstructure degradation and subsequent phase transformations in Waspaloy nickel-based superalloy during thermal exposure at 780 °C for 10,000 h were investigated. Two paths of η phase formation in the centre of extra-large γ’ (EL-γ’) following the formation of EL-γ’ were observed: (i) η phase...

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Published in:	Acta Materialia
ISSN:	1359-6454
Published:	Elsevier BV 2020
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa53128
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first_indexed	2020-01-13T13:29:59Z
last_indexed	2020-09-17T03:16:16Z
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spelling	2020-01-07T10:16:05.9389145 v2 53128 2020-01-07 The nucleation and growth of η phase in nickel-based superalloy during long-term thermal exposure 3445603fcc2ff9d27b476a73b223a507 0000-0002-8380-771X Soran Birosca Soran Birosca true false 2020-01-07 EEN The microstructure degradation and subsequent phase transformations in Waspaloy nickel-based superalloy during thermal exposure at 780 °C for 10,000 h were investigated. Two paths of η phase formation in the centre of extra-large γ’ (EL-γ’) following the formation of EL-γ’ were observed: (i) η phase directly precipitated within EL-γ’ when the coalescence of γ’ reached a critical stage; (ii) η phase precipitated at the interface of small size MC carbide and EL-γ’, with both MC and η embedded inside EL-γ’. The phase transformation process including the formation of EL-γ’ were experimentally observed and the formation sequences were schematically suggested. Two criteria of η formation and growth within EL-γ’ were established: (i) stacking faults formation in the nucleation site and (ii) sufficient atom diffusion during nuclei growth. The study of kinetics of η formation through two different paths revealed the critical role of small size carbides in promoting η nucleation and growth. It is concluded that η formation may be suppressed by controlling the size and density of MC carbides during materials processing. Journal Article Acta Materialia 185 493 506 Elsevier BV 1359-6454 Nickel-based superalloy, η phase, MC-carbide, Phase transformation, Waspaloy 15 2 2020 2020-02-15 10.1016/j.actamat.2019.12.038 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2020-01-07T10:16:05.9389145 2020-01-07T10:16:05.9389145 Gang Liu 1 Xueshan Xiao 2 Muriel Véron 3 Soran Birosca 0000-0002-8380-771X 4 53128__16270__c9d7132fe6744adea42d4d0c45b990f6.pdf liu2019.pdf 2020-01-13T10:04:41.7206063 Output 1682102 application/pdf Accepted Manuscript true 2020-12-24T00:00:00.0000000 Released under the terms of a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND). true eng http://creativecommons.org/licenses/by-nc-nd/4.0/
title	The nucleation and growth of η phase in nickel-based superalloy during long-term thermal exposure
spellingShingle	The nucleation and growth of η phase in nickel-based superalloy during long-term thermal exposure Soran Birosca
title_short	The nucleation and growth of η phase in nickel-based superalloy during long-term thermal exposure
title_full	The nucleation and growth of η phase in nickel-based superalloy during long-term thermal exposure
title_fullStr	The nucleation and growth of η phase in nickel-based superalloy during long-term thermal exposure
title_full_unstemmed	The nucleation and growth of η phase in nickel-based superalloy during long-term thermal exposure
title_sort	The nucleation and growth of η phase in nickel-based superalloy during long-term thermal exposure
author_id_str_mv	3445603fcc2ff9d27b476a73b223a507
author_id_fullname_str_mv	3445603fcc2ff9d27b476a73b223a507_***_Soran Birosca
author	Soran Birosca
author2	Gang Liu Xueshan Xiao Muriel Véron Soran Birosca
format	Journal article
container_title	Acta Materialia
container_volume	185
container_start_page	493
publishDate	2020
institution	Swansea University
issn	1359-6454
doi_str_mv	10.1016/j.actamat.2019.12.038
publisher	Elsevier BV
document_store_str	1
active_str	0
description	The microstructure degradation and subsequent phase transformations in Waspaloy nickel-based superalloy during thermal exposure at 780 °C for 10,000 h were investigated. Two paths of η phase formation in the centre of extra-large γ’ (EL-γ’) following the formation of EL-γ’ were observed: (i) η phase directly precipitated within EL-γ’ when the coalescence of γ’ reached a critical stage; (ii) η phase precipitated at the interface of small size MC carbide and EL-γ’, with both MC and η embedded inside EL-γ’. The phase transformation process including the formation of EL-γ’ were experimentally observed and the formation sequences were schematically suggested. Two criteria of η formation and growth within EL-γ’ were established: (i) stacking faults formation in the nucleation site and (ii) sufficient atom diffusion during nuclei growth. The study of kinetics of η formation through two different paths revealed the critical role of small size carbides in promoting η nucleation and growth. It is concluded that η formation may be suppressed by controlling the size and density of MC carbides during materials processing.
published_date	2020-02-15T04:05:57Z
_version_	1763753441626161152
score	11.012678

The nucleation and growth of η phase in nickel-based superalloy during long-term thermal exposure

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