Revealing the relation between microstructural heterogeneities and local mechanical properties of complex-phase steel by correlative electron microscopy and nanoindentation characterization

被引：47

作者：

Chang, Yuling ^{[1
]}

Lin, Mingxuan ^{[1
]}

Hangen, Ude ^{[2
]}

Richter, Silvia ^{[3
]}

Haase, Christian ^{[1
]}

Bleck, Wolfgang ^{[1
]}

机构：

[1] Rhein Westfal TH Aachen, Steel Inst, D-52072 Aachen, Germany

[2] Bruker Nano Surfaces, D-52068 Aachen, Germany

[3] Rhein Westfal TH Aachen, Cent Facil Electron Microscopy, D-52074 Aachen, Germany

来源：

MATERIALS & DESIGN | 2021年 / 203卷

关键词：

Complex-phase steel; Microstructural heterogeneity; Electron probe microanalysis; Electron backscatter diffraction; Nanoindentation;

D O I：

10.1016/j.matdes.2021.109620

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Compositional and microstructural heterogeneity are characteristics of modern multiphase steels. However, the quantitative characterization of these heterogeneities is rarely considered in scientific publications. We characterized the compositional and microstructural heterogeneity of a commercial complex-phase steel (CP800) by combining various electron microscopy techniques and nanoindentation. Compositional gradients of C and Mn were characterized qualitatively and quantitatively through electron probe microanalysis (EPMA). Electron back scatter diffraction (EBSD) results were utilized to identify and segment the microstructural constituents. A novel nanoindentation approach was used to obtain hardness maps. Cube-corner indenter and micro-newton load were applied to limit the indent depth and spacing between adjacent indents to the nanometer scale. A high resolution hardness map was obtained and successfully overlapped with EPMA and EBSD results, based on which the correlation between compositional heterogeneity and hardness variation in complex-phase microstructure was successfully established. (c) 2021 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/).

引用

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