Yielding behaviour of martensite in steel

Hutchinson, Bevis, Lindell, David and Barnett, Matthew 2015, Yielding behaviour of martensite in steel, ISIJ International, vol. 55, no. 5, pp. 1114-1122, doi: 10.2355/isijinternational.55.1114.

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Title Yielding behaviour of martensite in steel
Author(s) Hutchinson, Bevis
Lindell, David
Barnett, MatthewORCID iD for Barnett, Matthew orcid.org/0000-0001-8287-9044
Journal name ISIJ International
Volume number 55
Issue number 5
Start page 1114
End page 1122
Total pages 9
Publisher Iron and Steel Institute of Japan
Place of publication Tokyo, Japan
Publication date 2015
ISSN 0915-1559
Keyword(s) Internal stress
Science & Technology
Metallurgy & Metallurgical Engineering
Summary Although martensite is recognised as a very strong phase in carbon steels, its initial yielding commences at low stresses and the tensile stress-strain curve shows a smooth, rounded form. Evidence is presented from x-ray diffraction to show that this behaviour is due to the presence of intra-granular stresses that are residues after the shear transformation from austenite to martensite. These internal stresses are reduced in magnitude by plastic deformation and also by tempering. Reduction of internal stress due to plasticity is shown by a decrease in XRD line broadening after deformation. A simple model is presented in which the stress-strain behaviour is controlled by relaxation of the internal stresses almost up to the point of the ultimate tensile strength. It demonstrates that only a very small fraction of the material remaining in a purely elastic state provides a large stabilising effect resisting necking. A corollary of this is that the uniform elongation of martensitic steel actually increases with increase in the strength level. Effects of heat treatment are also reproduced in the model, including the increase in conventional yield stress (Rp0.2) that occurs after low temperature tempering.
Language eng
DOI 10.2355/isijinternational.55.1114
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 861199 Basic Metal Products (incl. Smelting
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Iron and Steel Institute of Japan
Persistent URL http://hdl.handle.net/10536/DRO/DU:30077296

Document type: Journal Article
Collection: Institute for Frontier Materials
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