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Cyclic deformation of advanced high-strength steels : mechanical behavior and microstructural analysis

journal contribution
posted on 2009-02-01, 00:00 authored by Tim HilditchTim Hilditch, Ilana Timokhina, Leigh Robertson, E Pereloma, Peter HodgsonPeter Hodgson
The fatigue properties of multiphase steels are an important consideration in the automotive industry. The different microstructural phases present in these steels can influence the strain life and cyclic stabilized strength of the material due to the way in which these phases accommodate the applied cyclic strain. Fully reversed strain-controlled low-cycle fatigue tests have been used to determine the mechanical fatigue performance of a dual-phase (DP) 590 and transformation-induced plasticity (TRIP) 780 steel, with transmission electron microscopy (TEM) used to examine the deformed microstructures. It is shown that the higher strain life and cyclic stabilized strength of the TRIP steel can be attributed to an increased yield strength. Despite the presence of significant levels of retained austenite in the TRIP steel, both steels exhibited similar cyclic softening behavior at a range of strain amplitudes due to comparable ferrite volume fractions and yielding characteristics. Both steels formed low-energy dislocation structures in the ferrite during cyclic straining.

History

Journal

Metallurgical and materials transactions A : physical metallurgy and materials science

Volume

40

Issue

2

Pagination

342 - 353

Publisher

Springer New York LLC

Location

New York, N.Y.

ISSN

1073-5623

eISSN

1543-1940

Language

eng

Publication classification

C1 Refereed article in a scholarly journal; C Journal article

Copyright notice

2008, The Minerals, Metals & Materials Society and ASM International