Experimental observation of microstructure evolution under strain-path changes in low-carbon IF steel

The microstructure of a Ti-killed interstitial free (IF) steel has been examined through TEM observations after simple-shear/simple-shear strain-path changes, in connection with the crystallographic orientation of the examined grains. A partial disappearance of prestrain microstructures is shown to...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2001-07, Vol.309, p.495-499
Main Authors: Nesterova, E.V, Bacroix, B, Teodosiu, C
Format: Article
Language:English
Subjects:
IF steels
Microstructure
Simple shear tests
Strain-path changes
Texture
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Summary:The microstructure of a Ti-killed interstitial free (IF) steel has been examined through TEM observations after simple-shear/simple-shear strain-path changes, in connection with the crystallographic orientation of the examined grains. A partial disappearance of prestrain microstructures is shown to cause the stagnation of work hardening at earlier stages of reversed loading during Bauschinger simple shear sequences. Under progressing reversed deformation, a fragmentation of the grains of unstable orientations still slows down the work-hardening rate. A strong localization of plastic flow within microbands following an orthogonal strain-path change is shown to occur within the grains containing well-developed prestrain dislocation boundaries and belonging to certain orientation groups.
ISSN:0921-5093
1873-4936
DOI:10.1016/S0921-5093(00)01639-7