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The effect of low cycle fatigue, ratcheting and mean stress relaxation on stress-strain response and microstructural development in a dual phase steel

Paul, Surajit Kumar, Stanford, Nicole, Taylor, Adam and Hilditch, Timothy 2015, The effect of low cycle fatigue, ratcheting and mean stress relaxation on stress-strain response and microstructural development in a dual phase steel, International journal of fatigue, vol. 80, pp. 341-348, doi: 10.1016/j.ijfatigue.2015.06.003.

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Title The effect of low cycle fatigue, ratcheting and mean stress relaxation on stress-strain response and microstructural development in a dual phase steel
Author(s) Paul, Surajit Kumar
Stanford, Nicole
Taylor, Adam
Hilditch, TimothyORCID iD for Hilditch, Timothy orcid.org/0000-0003-0300-5774
Journal name International journal of fatigue
Volume number 80
Start page 341
End page 348
Total pages 8
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-07
ISSN 0142-1123
Keyword(s) Dual phase steel
Local misorientation
Low-cycle fatigue
Mean stress relaxation
Ratcheting
Summary This study examines the cyclic plastic deformation behavior and microstructural development of a dual phase steel in both symmetric and asymmetric cycling in strain and stress control modes. The low-cycle fatigue (LCF) and mean stress relaxation (MSR) tests show very similar fatigue lifetimes. However, fatigue lifetimes reduce and prominent accumulation of directional strain was observed in ratcheting. A microstructural analysis has revealed that the type of cyclic test carried out has a noticeable impact on the substructural development, and this has been correlated with differences in accumulated tensile strain. Electron backscatter diffraction investigation has shown larger in-grain misorientation for ratcheting specimen in comparison with LCF and MSR specimens. The orientation of ferrite grains was found to have very little effect on their substructural development, and strain localization commonly occurred in the ferrite at the ferrite/martensite interface.
Language eng
DOI 10.1016/j.ijfatigue.2015.06.003
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30074736

Document type: Journal Article
Collections: School of Engineering
Institute for Frontier Materials
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