Strength and toughness of clean nanostructured bainite
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Peer-reviewed
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Abstract
A nanostructured steel has been produced using a clean steel-making technique. The mechanical properties have been comprehensively characterised. The maximum strength of the material recorded was 2.2 GPa at yield, with an ultimate tensile strength of 2.5 GPa, accompanied by a Charpy impact energy of 5 J, achieved by heat treatment to refine the prior austenite grain size from 145 to 20 µm. This increased the strength by 40% and the Charpy V-notch energy more than doubled. In terms of resistance of the hardness to tempering, the behaviour observed was similar to previous alloys. Despite reducing the hardness and strength, tempering was observed to reduce the plane-strain fracture toughness.
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Keywords
bainite, microstructure, mechanical properties, fatigue
Journal Title
Materials Science and Technology
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Journal ISSN
0267-0836
1743-2847
1743-2847
Volume Title
33
Publisher
Taylor & Francis
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This work was supported by Rolls-Royce.