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The Effect of a Two-Stage Heat-Treatment on the Microstructural and Mechanical Properties of a Maraging Steel
,
Lin Sun,
Deri Galvin,
Paul Hill,
Martin Rawson,
Soran Birosca ,
Elliot Gilbert,
Harshad Bhadeshia,
Karen Perkins
Materials, Volume: 10, Issue: 12, Start page: 1346
Swansea University Authors:
Thomas Simm , Soran Birosca , Karen Perkins
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DOI (Published version): 10.3390/ma10121346
Abstract
Maraging steels gain many of their beneficial properties from heat treatments which induce the precipitation of intermetallic compounds. We consider here a two-stage heat-treatment, first involving austenitisation, followed by quenching to produce martensite and then an ageing treatment at a lower t...
| Published in: | Materials |
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| ISSN: | 1996-1944 |
| Published: |
2017
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa37307 |
| Abstract: |
Maraging steels gain many of their beneficial properties from heat treatments which induce the precipitation of intermetallic compounds. We consider here a two-stage heat-treatment, first involving austenitisation, followed by quenching to produce martensite and then an ageing treatment at a lower temperature to precipitation harden the martensite of a maraging steel. It is shown that with a suitable choice of the initial austenitisation temperature, the steel can be heat treated to produce enhanced toughness, strength and creep resistance. A combination of small angle neutron scattering, scanning electron microscopy, electron back-scattered diffraction, and atom probe tomography were used to relate the microstructural changes to mechanical properties. It is shown that such a combination of characterisation methods is necessary to quantify this complex alloy, and relate these microstructural changes to mechanical properties. It is concluded that a higher austenitisation temperature leads to a greater volume fraction of smaller Laves phase precipitates formed during ageing, which increase the strength and creep resistance but reduces toughness. |
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| Keywords: |
small angle neutron scattering; maraging steel; precipitation strengthening; NiAl; Laves phase; atom probe tomography; creep; strength; ductile to brittle transition temperature |
| College: |
Faculty of Science and Engineering |
| Issue: |
12 |
| Start Page: |
1346 |