Journal
ACTA MATERIALIA
Volume 57, Issue 18, Pages 5283-5291Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.06.021
Keywords
Martensitic steel; Plastic deformation; Electron backscattering diffraction; Crystal rotation
Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan
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Electron backscattering diffraction patterns were used to investigate the relationship between local deformation behavior and the crystallographic features of as-quenched lath martensite of low-carbon steel during uniform elongation in tensile tests. The slip system operating during the deformation up to a strain of 20% was estimated by comparing the crystal rotation of each martensite block after deformation of 20% strain with predictions by the Taylor and Sachs models. The results indicate that the in-lath-plane slip system was preferentially activated compared to the out-of-lath-plane system up to this strain level. Further detailed analysis of crystal rotation at intervals of approximately 5% strain confirmed that the constraint on the operative slip system by the lath structure begins at a strain of 8% and that the local strain hardening of the primary slip systems occurred at approximately 15% strain. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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