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

• 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.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)

Nyckelord

Cast iron

Digital volume correlation

Micromechanics

Solidification microstructure

Strain distribution

Ductility

Solidification

Strain measurement

Digital volume correlations

Distance functions

Graphite particles

Metallographic examination

Microstructural heterogeneity

Solidification microstructures

Strain distributions

Strain partitioning

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