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A novel ultra-high strength maraging steel with balanced ductility and creep resistance achieved by nanoscale β-NiAl and Laves phase precipitates

L. Sun, T.H. Simm, T.L. Martin, S. McAdam, D.R. Galvin, K.M. Perkins, P.A.J. Bagot, M.P. Moody, S.W. Ooi, P. Hill, M.J. Rawson, H.K.D.H. Bhadeshia, Karen Perkins Orcid Logo, Thomas Simm Orcid Logo

Acta Materialia, Volume: 149, Pages: 285 - 301

Swansea University Authors: Karen Perkins Orcid Logo, Thomas Simm Orcid Logo

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DOI (Published version): 10.1016/j.actamat.2018.02.044

Abstract

A novel ultra-high strength precipitation hardened martensitic steel with balanced ductility and creep resistance has been developed. It utilises a unique combination of nanometre scale intermetallic precipitates of Laves phases and β-NiAl to achieve such properties. The mechanical properties of thi...

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Published in: Acta Materialia
ISSN: 1359-6454
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa39001
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It utilises a unique combination of nanometre scale intermetallic precipitates of Laves phases and &#x3B2;-NiAl to achieve such properties. The mechanical properties of this steel were assessed by tensile and creep testing. With different heat treatments, this steel showed a remarkable combination of mechanical properties: yield strength of &amp;#62;1800&#x202F;MPa, ultimate tensile strength of &#x223C;2000&#x202F;MPa, tensile ductility up to &#x223C;8% at room temperature and creep rupture life &amp;#62;2000&#x202F;h under 700&#x202F;MPa stress at 500&#x202F;&#xB0;C. The microstructures at different length scales were characterised using scanning/transmission electron microscopy and atom probe tomography. The austenisation and ageing temperatures were found be the key factors determining the microstructural development and resulting mechanical properties. Large primary Laves phase precipitates formed at lower austenisation temperatures resulted in reduced creep strength; whilst the small difference (20&#x202F;&#xB0;C) in ageing temperatures had significant impact on the spatial distribution characteristics of &#x3B2;-NiAl precipitates. Lower ageing temperature produced much smaller but more uniformly distributed &#x3B2;-NiAl precipitates which contributed to the higher observed yield strength. It is clear from this study that whilst this novel alloy system showed great potentials, careful design of heat treatment is still required to achieve balanced mechanical properties to meet the service requirements in aerospace propulsion systems.</abstract><type>Journal Article</type><journal>Acta Materialia</journal><volume>149</volume><paginationStart>285</paginationStart><paginationEnd>301</paginationEnd><publisher/><issnPrint>1359-6454</issnPrint><keywords>Steel; Precipitation; Nanostructure; Transmission electron microscopy (TEM); Atom probe tomography (APT)</keywords><publishedDay>1</publishedDay><publishedMonth>5</publishedMonth><publishedYear>2018</publishedYear><publishedDate>2018-05-01</publishedDate><doi>10.1016/j.actamat.2018.02.044</doi><url>https://authors.elsevier.com/c/1Wgzz4r9SUBQXM</url><notes/><college>COLLEGE NANME</college><department>Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>EEN</DepartmentCode><institution>Swansea University</institution><degreesponsorsfunders>UK Engineering and Physical Sciences Research Council (EPSRC) under grants EP/H500383/1 and EP/H500383/1. 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spelling 2018-05-09T13:50:48.9682246 v2 39001 2018-03-08 A novel ultra-high strength maraging steel with balanced ductility and creep resistance achieved by nanoscale β-NiAl and Laves phase precipitates f866eaa2d8f163d2b4e99259966427c8 0000-0001-5826-9705 Karen Perkins Karen Perkins true false 10fa7732a6aee5613ff1364dc8460972 0000-0001-6305-9809 Thomas Simm Thomas Simm true false 2018-03-08 EEN A novel ultra-high strength precipitation hardened martensitic steel with balanced ductility and creep resistance has been developed. It utilises a unique combination of nanometre scale intermetallic precipitates of Laves phases and β-NiAl to achieve such properties. The mechanical properties of this steel were assessed by tensile and creep testing. With different heat treatments, this steel showed a remarkable combination of mechanical properties: yield strength of &#62;1800 MPa, ultimate tensile strength of ∼2000 MPa, tensile ductility up to ∼8% at room temperature and creep rupture life &#62;2000 h under 700 MPa stress at 500 °C. The microstructures at different length scales were characterised using scanning/transmission electron microscopy and atom probe tomography. The austenisation and ageing temperatures were found be the key factors determining the microstructural development and resulting mechanical properties. Large primary Laves phase precipitates formed at lower austenisation temperatures resulted in reduced creep strength; whilst the small difference (20 °C) in ageing temperatures had significant impact on the spatial distribution characteristics of β-NiAl precipitates. Lower ageing temperature produced much smaller but more uniformly distributed β-NiAl precipitates which contributed to the higher observed yield strength. It is clear from this study that whilst this novel alloy system showed great potentials, careful design of heat treatment is still required to achieve balanced mechanical properties to meet the service requirements in aerospace propulsion systems. Journal Article Acta Materialia 149 285 301 1359-6454 Steel; Precipitation; Nanostructure; Transmission electron microscopy (TEM); Atom probe tomography (APT) 1 5 2018 2018-05-01 10.1016/j.actamat.2018.02.044 https://authors.elsevier.com/c/1Wgzz4r9SUBQXM COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University UK Engineering and Physical Sciences Research Council (EPSRC) under grants EP/H500383/1 and EP/H500383/1. UK EPSRC support under grant EP/H500375/1. UK EPSRC under grant EP/M022803/1. 2018-05-09T13:50:48.9682246 2018-03-08T15:03:34.0825058 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised L. Sun 1 T.H. Simm 2 T.L. Martin 3 S. McAdam 4 D.R. Galvin 5 K.M. Perkins 6 P.A.J. Bagot 7 M.P. Moody 8 S.W. Ooi 9 P. Hill 10 M.J. Rawson 11 H.K.D.H. Bhadeshia 12 Karen Perkins 0000-0001-5826-9705 13 Thomas Simm 0000-0001-6305-9809 14 0039001-09032018114148.pdf sun2018.pdf 2018-03-09T11:41:48.0470000 Output 3086521 application/pdf Accepted Manuscript true 2019-03-08T00:00:00.0000000 true eng
title A novel ultra-high strength maraging steel with balanced ductility and creep resistance achieved by nanoscale β-NiAl and Laves phase precipitates
spellingShingle A novel ultra-high strength maraging steel with balanced ductility and creep resistance achieved by nanoscale β-NiAl and Laves phase precipitates
Karen Perkins
Thomas Simm
title_short A novel ultra-high strength maraging steel with balanced ductility and creep resistance achieved by nanoscale β-NiAl and Laves phase precipitates
title_full A novel ultra-high strength maraging steel with balanced ductility and creep resistance achieved by nanoscale β-NiAl and Laves phase precipitates
title_fullStr A novel ultra-high strength maraging steel with balanced ductility and creep resistance achieved by nanoscale β-NiAl and Laves phase precipitates
title_full_unstemmed A novel ultra-high strength maraging steel with balanced ductility and creep resistance achieved by nanoscale β-NiAl and Laves phase precipitates
title_sort A novel ultra-high strength maraging steel with balanced ductility and creep resistance achieved by nanoscale β-NiAl and Laves phase precipitates
author_id_str_mv f866eaa2d8f163d2b4e99259966427c8
10fa7732a6aee5613ff1364dc8460972
author_id_fullname_str_mv f866eaa2d8f163d2b4e99259966427c8_***_Karen Perkins
10fa7732a6aee5613ff1364dc8460972_***_Thomas Simm
author Karen Perkins
Thomas Simm
author2 L. Sun
T.H. Simm
T.L. Martin
S. McAdam
D.R. Galvin
K.M. Perkins
P.A.J. Bagot
M.P. Moody
S.W. Ooi
P. Hill
M.J. Rawson
H.K.D.H. Bhadeshia
Karen Perkins
Thomas Simm
format Journal article
container_title Acta Materialia
container_volume 149
container_start_page 285
publishDate 2018
institution Swansea University
issn 1359-6454
doi_str_mv 10.1016/j.actamat.2018.02.044
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
url https://authors.elsevier.com/c/1Wgzz4r9SUBQXM
document_store_str 1
active_str 0
description A novel ultra-high strength precipitation hardened martensitic steel with balanced ductility and creep resistance has been developed. It utilises a unique combination of nanometre scale intermetallic precipitates of Laves phases and β-NiAl to achieve such properties. The mechanical properties of this steel were assessed by tensile and creep testing. With different heat treatments, this steel showed a remarkable combination of mechanical properties: yield strength of &#62;1800 MPa, ultimate tensile strength of ∼2000 MPa, tensile ductility up to ∼8% at room temperature and creep rupture life &#62;2000 h under 700 MPa stress at 500 °C. The microstructures at different length scales were characterised using scanning/transmission electron microscopy and atom probe tomography. The austenisation and ageing temperatures were found be the key factors determining the microstructural development and resulting mechanical properties. Large primary Laves phase precipitates formed at lower austenisation temperatures resulted in reduced creep strength; whilst the small difference (20 °C) in ageing temperatures had significant impact on the spatial distribution characteristics of β-NiAl precipitates. Lower ageing temperature produced much smaller but more uniformly distributed β-NiAl precipitates which contributed to the higher observed yield strength. It is clear from this study that whilst this novel alloy system showed great potentials, careful design of heat treatment is still required to achieve balanced mechanical properties to meet the service requirements in aerospace propulsion systems.
published_date 2018-05-01T03:49:29Z
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score 11.012678

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