Micromechanical impact of solidification regions in ductile iron revealed via a 3D strain partitioning analysis method

SCRIPTA MATERIALIA

卷:178

Article

Xu, C. L.¹  Andriollo, T.¹  Zhang, Y. B.¹  Hernando, J. C.²  Hattel, J.¹  Tiedje, N.¹ 

[1] Tech Univ Denmark, Dept Mech Engn, Prod Storvet, Bldg 425,Room 225, DK-2800 Lyngby, Denmark

[2] Jonkoping Univ, Sch Engn, Dept Mat & Mfg, Jonkoping, Sweden

关键词: Digital volume correlation;    Micromechanics;    Cast iron;    Solidification microstructure;    Strain distribution;   

DOI  :  10.1016/j.scriptamat.2019.12.018

来源: Elsevier

【 摘 要 】

Strain partitioning between first-to-solidify (FTS) and last-to-solidify (LTS) regions upon tensile loading of ductile iron was investigated by combining in-situ X-ray tomography with digital volume correlation and postmortem metallographic examinations. The results indicate that the plastic shear bands form mainly by linking graphite particles contained in the same FTS region. A special distance function is introduced to show that this is due to the lower strength of the FTS regions compared to the LTS regions, but also to the higher stress concentration associated with the particles. The methodology is general and therefore extendable to material systems containing similar microstructural heterogeneities. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free