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Effect of martensite morphology on low cycle fatigue behaviour of dual phase steels: Experimental and microstructural investigation

Paul, Surajit Kumar, Stanford, Nicole and Hilditch, Timothy 2015, Effect of martensite morphology on low cycle fatigue behaviour of dual phase steels: Experimental and microstructural investigation, Materials science and engineering A, vol. 644, pp. 53-60, doi: 10.1016/j.msea.2015.07.044.

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Title Effect of martensite morphology on low cycle fatigue behaviour of dual phase steels: Experimental and microstructural investigation
Author(s) Paul, Surajit Kumar
Stanford, Nicole
Hilditch, TimothyORCID iD for Hilditch, Timothy orcid.org/0000-0003-0300-5774
Journal name Materials science and engineering A
Volume number 644
Start page 53
End page 60
Total pages 8
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-09-07
ISSN 0921-5093
Keyword(s) Cyclic hardening and softening
Dual phase steel
Low cycle fatigue
Martensite morphology
Martensite volume fraction
Sub-cell formation
Summary The low cycle fatigue (LCF) behaviour of a dual phase (DP) steel with different martensite morphologies has been investigated in the present work. DP steels with coarse martensite morphologies show inferior LCF life in comparison with fine martensite morphologies for all martensite volume fractions examined. It is suggested that this is be due to the development of larger local plastic strain concentrations in the ferrite with a coarser microstructure, compared to the finer microstructural morphology. Fatigue cracks were observed to initiate inside ferrite grains, and to preferentially propagate through the softer ferrite phase. The average sub-cell size was finer in samples with higher martensite volume fractions, but the sub-cell size was almost unaffected by the martensite morphology.
Language eng
DOI 10.1016/j.msea.2015.07.044
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:30075598

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