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The Effect of a Two-Stage Heat-Treatment on the Microstructural and Mechanical Properties of a Maraging Steel / Thomas Simm; 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 Author: Perkins, Karen

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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...

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Published in: Materials
ISSN: 1996-1944
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa37336
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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.
Keywords: small angle neutron scattering; maraging steel; precipitation strengthening; NiAl; Laves phase; atom probe tomography; creep; strength; ductile to brittle transition temperature
College: College of Engineering
Issue: 12
Start Page: 1346