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

Version 2 2024-06-03, 12:33
Version 1 2015-08-18, 13:40
journal contribution
posted on 2024-06-03, 12:33 authored by SK Paul, N Stanford, Tim HilditchTim Hilditch
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.

History

Journal

Materials science and engineering A

Volume

644

Pagination

53-60

Location

Amsterdam, The Netherlands

ISSN

0921-5093

Language

eng

Publication classification

C Journal article, C1 Refereed article in a scholarly journal

Copyright notice

2015, Elsevier

Publisher

Elsevier