Slip band formation at free surface of lath martensite in low carbon steel

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 u...

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Bibliographic Details
Published inActa materialia Vol. 165; pp. 129 - 141
Main Authors Inoue, Junya, Sadeghi, Alireza, Koseki, Toshihiko
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.02.2019
Subjects
Lath martensite
Non-Schmid effect
Retained austenite
Substructure sliding
Retained austenite
Substructure sliding
Lath martensite
Non-Schmid effect
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Summary: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. [Display omitted]
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2018.11.026