Abstract
This paper proposes the efficacy of martensite nano-twins in a medium carbon armor grade martensitic steel on the cleavage crack resistance at a local scale. Concurrent analyses through electron channeling contrast imaging and electron back scattered diffraction techniques reveal that fine twins of width less than 10 nm are ineffective in deflecting the crack, propagating in the {100} cleavage plane. Coarse twins, on the other hand, resist the crack propagation by deflecting the crack through stepwise crack path propagations, e.g., a combination of matrix-twin {100} cleavage cracking or a combination of matrix {100} and twin-matrix {112} interface cracking. The interfacial cracking along the {112} twin boundaries is attributed to the presence of carbon enriched clusters along the twin boundaries.
| Original language | English |
|---|---|
| Article number | 101800 |
| Journal | Materialia |
| Volume | 30 |
| DOIs | |
| Publication status | Published - Aug 2023 |
| MoE publication type | A1 Journal article-refereed |
Funding
The authors sincerely acknowledge Dr. Stefan Zaefferer and Dr. Baptiste Gault, Department Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany for providing the EBSD-ECCI and APT facilities along with their valuable discussion in data interpretation. The authors acknowledge the research facilities offered by the Department of Metallurgical and Materials Engineering, and the Central Research Facility at IIT, Kharagpur. The authors also wish to acknowledge Dr. Saurabh Mohan Das, Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany for rendering support in TEM studies.
Keywords
- Carbon enriched clusters
- Electron channeling contrast imaging (ECCI)
- Impact test
- Martensitic steels
- Misorientation
- Twinning