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Microstructural evolution of a delta containing nickel-base superalloy during heat treatment and isothermal forging

P.M. Mignanelli, N.G. Jones, K.M. Perkins, M.C. Hardy, H.J. Stone, Karen Perkins Orcid Logo

Materials Science and Engineering: A, Volume: 621, Pages: 265 - 271

Swansea University Author: Karen Perkins Orcid Logo

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Abstract

The next generation of aerospace gas turbine engines need to operate at higher temperatures and stresses to improve their efficiency and reduce emissions. These operating conditions are beyond the capability of existing nickel-base superalloys, requiring the development of new high temperature mater...

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Published in: Materials Science and Engineering: A
ISSN: 0921-5093
Published: 2015
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URI: https://cronfa.swan.ac.uk/Record/cronfa19496
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spelling 2020-09-22T10:28:06.1197938 v2 19496 2014-11-24 Microstructural evolution of a delta containing nickel-base superalloy during heat treatment and isothermal forging f866eaa2d8f163d2b4e99259966427c8 0000-0001-5826-9705 Karen Perkins Karen Perkins true false 2014-11-24 EEN The next generation of aerospace gas turbine engines need to operate at higher temperatures and stresses to improve their efficiency and reduce emissions. These operating conditions are beyond the capability of existing nickel-base superalloys, requiring the development of new high temperature materials. Controlling the microstructures of these new materials is key to obtaining the required properties and, therefore, it is critical to understand how these alloys respond to processing and heat treatment. Here, the microstructural evolution of V207M, a new δ containing, nickel-base superalloy, has been investigated following heat treatment and forging. The solvus temperatures of the γ′ and δ phases, determined by differential scanning calorimetry and microscopy, were found to be ~985 and ~1060 °C respectively. Isothermal forging of the alloy was conducted at 1000, 1050 and 1100 °C, corresponding to different volume fractions of retained δ. Considerable softening was observed prior to steady state flow when forging at 1000 °C, whilst only steady state flow occurred at 1050 and 1100 °C. The steady state flow process was believed to be dominated by dynamic recovery in the γ phase, with an activation energy of 407 kJmol−1. Samples that exhibited flow softening also showed a significant change in the orientation of the δ precipitates, preferentially aligning normal to the forging axis, and this reorientation was thought to be the cause of the observed flow softening. Journal Article Materials Science and Engineering: A 621 265 271 0921-5093 5 1 2015 2015-01-05 10.1016/j.msea.2014.10.071 & 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license(http://creativecommons.org/licenses/by/3.0/). COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University EPSRC 2020-09-22T10:28:06.1197938 2014-11-24T14:22:53.8472143 College of Engineering Engineering P.M. Mignanelli 1 N.G. Jones 2 K.M. Perkins 3 M.C. Hardy 4 H.J. Stone 5 Karen Perkins 0000-0001-5826-9705 6 0019496-20072016163001.pdf 1-s2.0-S0921509314013252-main.pdf 2016-07-20T16:30:01.8930000 Output 3184292 application/pdf Version of Record true 2016-07-20T00:00:00.0000000 Copyright 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/) true
title Microstructural evolution of a delta containing nickel-base superalloy during heat treatment and isothermal forging
spellingShingle Microstructural evolution of a delta containing nickel-base superalloy during heat treatment and isothermal forging
Karen Perkins
title_short Microstructural evolution of a delta containing nickel-base superalloy during heat treatment and isothermal forging
title_full Microstructural evolution of a delta containing nickel-base superalloy during heat treatment and isothermal forging
title_fullStr Microstructural evolution of a delta containing nickel-base superalloy during heat treatment and isothermal forging
title_full_unstemmed Microstructural evolution of a delta containing nickel-base superalloy during heat treatment and isothermal forging
title_sort Microstructural evolution of a delta containing nickel-base superalloy during heat treatment and isothermal forging
author_id_str_mv f866eaa2d8f163d2b4e99259966427c8
author_id_fullname_str_mv f866eaa2d8f163d2b4e99259966427c8_***_Karen Perkins
author Karen Perkins
author2 P.M. Mignanelli
N.G. Jones
K.M. Perkins
M.C. Hardy
H.J. Stone
Karen Perkins
format Journal article
container_title Materials Science and Engineering: A
container_volume 621
container_start_page 265
publishDate 2015
institution Swansea University
issn 0921-5093
doi_str_mv 10.1016/j.msea.2014.10.071
college_str College of Engineering
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hierarchy_top_id collegeofengineering
hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
document_store_str 1
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description The next generation of aerospace gas turbine engines need to operate at higher temperatures and stresses to improve their efficiency and reduce emissions. These operating conditions are beyond the capability of existing nickel-base superalloys, requiring the development of new high temperature materials. Controlling the microstructures of these new materials is key to obtaining the required properties and, therefore, it is critical to understand how these alloys respond to processing and heat treatment. Here, the microstructural evolution of V207M, a new δ containing, nickel-base superalloy, has been investigated following heat treatment and forging. The solvus temperatures of the γ′ and δ phases, determined by differential scanning calorimetry and microscopy, were found to be ~985 and ~1060 °C respectively. Isothermal forging of the alloy was conducted at 1000, 1050 and 1100 °C, corresponding to different volume fractions of retained δ. Considerable softening was observed prior to steady state flow when forging at 1000 °C, whilst only steady state flow occurred at 1050 and 1100 °C. The steady state flow process was believed to be dominated by dynamic recovery in the γ phase, with an activation energy of 407 kJmol−1. Samples that exhibited flow softening also showed a significant change in the orientation of the δ precipitates, preferentially aligning normal to the forging axis, and this reorientation was thought to be the cause of the observed flow softening.
published_date 2015-01-05T03:36:35Z
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