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The effect of prestrain and bake hardening on the low-cycle fatigue properties of TRIP steel

journal contribution
posted on 2008-04-01, 00:00 authored by Leigh Robertson, Tim HilditchTim Hilditch, Peter HodgsonPeter Hodgson
The scope of this study was to examine the effects of plane strain prestrain, induced via cold-rolling, and subsequent automotive paint bake hardening cycle on both tensile and fatigue properties of a hot rolled TRIP780 multiphase steel. Strain-life data has been generated for as-received (0% prestrain), 10% and 20% prestrained samples, in both baked and unbaked conditions. Cold rolling  increased the number of strain reversals to failure at high cyclic strain amplitudes with no effect at low strain amplitudes. Bake hardening increased the number of reversals to failure at high cyclic strain amplitudes. The prestrained material exhibited partial cyclic softening, with some residual strength increase. The residual strength increase was attributed to the austenite to martensite transformation that occurred during the prestraining process.

History

Journal

International journal of fatigue

Volume

30

Issue

4

Pagination

587 - 594

Publisher

Elsevier Ltd

Location

Oxford, England

ISSN

0142-1123

eISSN

1879-3452

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2007, Elsevier