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- Title
Symmetry Breakdown Related Fracture in 42CrMo4 Steel.
- Authors
Feng, Jian; Barth, Stefan; Wettlaufer, Marc; Shabadi, Rajashekhara
- Abstract
Austenite grains that underwent the f.c.c. to b.c.c. (or b.c.t.) transformation are typically composed of 24 Kurdjumov–Sachs variants that can be categorized by three axes of Bain transformations; thus, a complete transformation generally displays 3-fold symmetry in (001) pole figures. In the present work, crystallographic symmetry in 42CrMo4 steel austempered below martensite start temperature was investigated with the help of the orientation distribution function (ODF) analysis based on the FEG-SEM/EBSD technique. It is shown that, upon phase transformations, the specimens contained 6-fold symmetry in all (001), (011), and (111) pole figures of an ODF. The ODF analysis, verified by theoretical modeling, showed that under plane-strain conditions cracks prefer to propagate through areas strongly offset by the high symmetry. The origin of high symmetry was investigated, and the mechanism of the symmetry breakdown was explained.
- Subjects
STEEL fracture; SYMMETRY; DISTRIBUTION (Probability theory); PHASE transitions; PEARLITIC steel
- Publication
Metals (2075-4701), 2021, Vol 11, Issue 2, p344
- ISSN
2075-4701
- Publication type
Article
- DOI
10.3390/met11020344