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Microstructural evolution and microhardness in a low carbon steel processed by high-pressure torsion

Microstructural evolution and microhardness in a low carbon steel processed by high-pressure torsion
Microstructural evolution and microhardness in a low carbon steel processed by high-pressure torsion
A low-carbon triple-alloyed steel was processed by high-pressure torsion at room temperature for up to 5 turns under a pressure of 6.0 GPa. Microhardness, scanning electron microscopy and X-ray diffraction were used to investigate the hardness and microstructural evolution of the steel. Values of the Vickers microhardness were recorded across the sample diameters. The results show that there is a gradual evolution in both the hardness and the microstructure with increasing numbers of turns. However, the microhardness does not become fully homogeneous across the sample diameter after five turns and there remain significantly lower values in the center of the disk. These results indicate that complete homogeneity across the disks for this steel requires applied pressures higher than 6.0 GPa and/or torsional straining through more than 5 turns.
hardness, high-pressure torsion, homogeneity, low carbon steel
2238-7854
344-348
Marulanda Cardona, Diana Maritza
24831acd-4922-4aa0-9eda-c4229ba6c0a4
Wongsa-Ngam, Jittraporn
3a196159-d8e5-4658-a47b-a6f6c5a7dcc7
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Marulanda Cardona, Diana Maritza
24831acd-4922-4aa0-9eda-c4229ba6c0a4
Wongsa-Ngam, Jittraporn
3a196159-d8e5-4658-a47b-a6f6c5a7dcc7
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Marulanda Cardona, Diana Maritza, Wongsa-Ngam, Jittraporn and Langdon, Terence G. (2014) Microstructural evolution and microhardness in a low carbon steel processed by high-pressure torsion. Journal of Materials Research and Technology, 3 (4), 344-348. (doi:10.1016/j.jmrt.2014.09.004).

Record type: Article

Abstract

A low-carbon triple-alloyed steel was processed by high-pressure torsion at room temperature for up to 5 turns under a pressure of 6.0 GPa. Microhardness, scanning electron microscopy and X-ray diffraction were used to investigate the hardness and microstructural evolution of the steel. Values of the Vickers microhardness were recorded across the sample diameters. The results show that there is a gradual evolution in both the hardness and the microstructure with increasing numbers of turns. However, the microhardness does not become fully homogeneous across the sample diameter after five turns and there remain significantly lower values in the center of the disk. These results indicate that complete homogeneity across the disks for this steel requires applied pressures higher than 6.0 GPa and/or torsional straining through more than 5 turns.

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Submitted date: 10 June 2014
Accepted/In Press date: 30 September 2014
e-pub ahead of print date: 6 November 2014
Keywords: hardness, high-pressure torsion, homogeneity, low carbon steel
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 377248
URI: http://eprints.soton.ac.uk/id/eprint/377248
ISSN: 2238-7854
PURE UUID: 0cf9919e-fe44-49bb-8729-8aaa8f44970a
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 20 May 2015 15:48
Last modified: 21 Nov 2021 02:52

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Contributors

Author: Diana Maritza Marulanda Cardona
Author: Jittraporn Wongsa-Ngam

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