Role of microstructure in the low cycle fatigue of multi-phase steels

Hilditch, Timothy, Beladi, Hossein, Hodgson, Peter D. and Stanford, Nicole 2012, Role of microstructure in the low cycle fatigue of multi-phase steels, Materials science and engineering : A, vol. 534, pp. 288-296.

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Title Role of microstructure in the low cycle fatigue of multi-phase steels
Author(s) Hilditch, TimothyORCID iD for Hilditch, Timothy
Beladi, HosseinORCID iD for Beladi, Hossein
Hodgson, Peter D.
Stanford, Nicole
Journal name Materials science and engineering : A
Volume number 534
Start page 288
End page 296
Total pages 9
Publisher Elsevier S.A.
Place of publication Lausanne, Switzerland
Publication date 2012-02-01
ISSN 0921-5093
Keyword(s) delamination
Summary The low cycle fatigue (LCF) behaviour of several commercially-produced multiphase steels was studied; including dual-phase (DP) and transformation induced plasticity (TRIP). In addition, a novel TRIP980 hybrid microstructure was examined that consisted of coarse ferrite grains along with low temperature bainite regions interspersed with retained austenite. Fully reversed strain controlled fatigue tests were conducted on the different steels to determine the cyclic stress response and strain to failure. The effects of the cyclic deformation on the microstructures were analysed using electron backscattered diffraction (EBSD) and X-ray diffraction (XRD). Results showed that the initial cyclic hardening behaviour and low cyclic softening ratio observed in the TRIP steels was not necessarily due to austenite to martensite transformation. Differences between the austenite transformation behaviour of the conventional and novel hybrid TRIP microstructures was related to the different surrounding phases and the size of the retained austenite.
Language eng
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 861103 Basic Iron and Steel Products
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2011, Elsevier B.V.
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