Journal
ACTA MATERIALIA
Volume 165, Issue -, Pages 129-141Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2018.11.026
Keywords
Lath martensite; Substructure sliding; Retained austenite; Non-Schmid effect
Funding
- JSPS KAKENHI [15H04151]
- Innovative Structural Materials Association (ISMA) project
- Grants-in-Aid for Scientific Research [15H04151] Funding Source: KAKEN
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Cross-sectional observations of the deformation bands formed during in situ tensile observation at the free surface of both ultralow- and low-carbon lath martensitic steels were conducted. The cross-sectional observations clearly revealed the formation of steps along substructure boundaries of the ultralow-carbon lath martensite during deformation. In contrast, severe undulation indicating strain accumulation was observed in the vicinity of high-angle boundaries for the low-carbon lath martensite, and no clear steps were formed along substructure boundaries, even though small filmlike ferrites were found. The greasy-film mechanism proposed by Maresca [Maresca et al., Modelling and Simulation in Materials Science and Engineering 24(2016)025006, Maresca and Curtin, Acta Materialia 134(2017)302] as well as the plastic instability theory proposed by Dao and Asaro [Dao and Asaro: Mech. Mater., 23(1996) 71] was examined considering the non-Schmid effects and the anisotropic activation of slip systems in lath martensite. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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