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Microstructural analysis of pre-strained TRIP steel after fatigue testing

Hilditch, Timothy B., Timokhina, Ilana B., Robertson, Leigh T., Pereloma, Elena V. and Hodgson, Peter D. 2008, Microstructural analysis of pre-strained TRIP steel after fatigue testing, in International Conference on New Developments in Advanced High-Strength Sheet Steels. Proceedings, Ronald E. Ashburn, USA, pp. 295-303.

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Title Microstructural analysis of pre-strained TRIP steel after fatigue testing
Author(s) Hilditch, Timothy B.
Timokhina, Ilana B.
Robertson, Leigh T.
Pereloma, Elena V.
Hodgson, Peter D.
Conference name International Conference on New Developments in Advanced High-Strength Sheet Steels (2008 : Orlando, Fla.)
Conference location Orlando, Fla.
Conference dates 15-18 June 2008
Title of proceedings International Conference on New Developments in Advanced High-Strength Sheet Steels. Proceedings
Publication date 2008
Start page 295
End page 303
Publisher Ronald E. Ashburn
Place of publication USA
Keyword(s) AHSS
TRIP steel
Low-cycle fatigue
Pre-strain
TEM
Cyclic stabilised stress
Summary The widespread introduction of multiphase sheet steels in the automotive industry has led to considerable interest in the fatigue properties of these materials. The different microstructural phases within matelials such as TRIP steels can influence the fatigue behaviour due to the manner in which the cyclic strain is accommodated within these phases. In this study fully reversed straincontrolled fatigue tests were perfonnrmed on a commercially-produced uncoated TRIP 780 steel both in the as-received and 20 % prestrained condition. The pre-strained TRIP steel showed significant cyclic softening at higher strain amplitudes, whereas some initial work hardening was observed at lower strain amplitudes before cyclic softening. The cyclic stabilised strength of the pre-strained TRIP steel was independent of strain amplitude, while the cyclic stabilised strength of the as-received TRIP steel increased with strain amplitude. Transmission Electron Microscopy TEM was used to examine the effect of the cyclic deformation on the microstructure of the different conditions, with the differences in fatigue behaviour explained based on the differences in the deformation structure formed within the steel (i.e. dislocation density and sub-structure and microband formation).
ISBN 9781886362994
1886362998
Language eng
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category E2 Full written paper - non-refereed / Abstract reviewed
Copyright notice ©2008, Ronald E. Ashburn
Persistent URL http://hdl.handle.net/10536/DRO/DU:30019295

Document type: Conference Paper
Collection: Centre for Material and Fibre Innovation
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