Authors
Ankit Kumar, Aniruddha Dutta, Surendra Kumar Makineni, Michael Herbig, RH Petrov, Jilt Sietsma
Publication date
2019/5/29
Journal
Materials Science and Engineering: A
Volume
757
Pages
107-116
Publisher
Elsevier
Description
In this article, we probe the strain partitioning between the microstructural features present in a continuously cooled carbide-free bainitic steel together with damage nucleation and propagation. These features mainly comprise of phases (bainitic ferrite, martensite, and blocky/thin film austenite), interfaces between them, grain size and grain morphology. A micro Digital Image Correlation (μ-DIC) technique in scanning electron microscope is used to quantify the strain distribution between these microstructural features. The results show a strong strain partitioning between martensite, bainitic ferrite and retained austenite that provides weak links in the microstructure and creates conditions for the crack initiation and propagation during deformation. Blocky austenite islands accommodate maximum local strains in the global strain range of 0–2.3% and undergo strain-induced austenite to martensite transformation …
Total citations
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