Multiple mechanisms of lath martensite plasticity

被引：229

作者：

Morsdorf, L. ^{[1
]}

Jeannin, O. ^{[1
]}

Barbier, D. ^{[2
]}

Mitsuhara, M. ^{[3
]}

Raabe, D. ^{[1
]}

Tasan, C. C. ^{[4
]}

机构：

[1] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany

[2] ArcelorMittal Res & Dev, Voie Romaine BP30320, F-57283 Maizieres Les Metz, France

[3] Kyushu Univ, Dept Engn Sci Elect & Mat, 6-1 Kasugakoen, Kasuga, Fukuoka 8168580, Japan

[4] MIT, Dept Mat Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA

来源：

ACTA MATERIALIA | 2016年 / 121卷

关键词：

EBSD; Austenite; Micro-mechanics; Strain mapping; DIC; RETAINED AUSTENITE FILMS; LOW-CARBON-STEELS; LOW-ALLOY STEEL; ATOM-PROBE; CRYSTAL PLASTICITY; DAMAGE RESISTANCE; GRAIN-BOUNDARIES; BLOCK BOUNDARY; IN-SITU; DEFORMATION;

D O I：

10.1016/j.actamat.2016.09.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The multi-scale complexity of lath martensitic microstructures requires scale-bridging analyses to better understand the deformation mechanisms activated therein. In this study, plasticity in lath martensite is investigated by multi-field mapping of deformation-induced microstructure, topography, and strain evolution at different spatial resolution vs. field-of-view combinations. These investigations reveal site specific initiation of dislocation activity within laths, as well as significant plastic accommodation in the vicinity of high angle block and packet boundaries. The observation of interface plasticity raises several questions regarding the role of thin inter-lath austenite films. Thus, accompanying transmission electron microscopy and synchrotron x-ray diffraction experiments are carried out to investigate the stability of these films to mechanical loading, and to discuss alternative boundary sliding mechanisms to explain the observed interface strain localization. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：202 / 214

页数：13

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