The symmetry origin of the austenite-cementite orientation relationships in steels
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Valentin Kraposhin
Abstract
The connection between austenite/cementite orientation relationships and crystal structure of both phases has been established. The nucleus formation mechanism at the mutual transformation of austenite and cementite structures has been proposed. Mechanism is based on the interpretation of the considered structures as crystallographic tiling onto triangulated polyhedra, and the said tiling can be transformed by diagonal flipping in a rhombus consisting of two adjacent triangular faces. The sequence of diagonal flipping in the fragment of the initial crystal determines the orientation of the fragment of the final crystal relative to the initial crystal. In case of the mutual austenite/cementite transformation the mutual orientation of the initial and final fragments is coinciding to the experimentally observed in steels Thomson-Howell orientation relationships:
The observed orientation relationship between FCC austenite and cementite is determined by crystallographic group-subgroup relationship between transformation participants, and non-crystallographic symmetry which is determining the transformation of triangulated clusters of transformation participants.
Funding source: Russian Foundation for Basic Research
Award Identifier / Grant number: 19-02-00085
Funding statement: The authors are grateful to professor Ya. L. Linetsky for valuable discussions. This research was fulfilled with financial support from Russian Foundation for Basic Research (RFBR), grant # 19-02-00085.
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Articles in the same Issue
- Frontmatter
- Graphical Synopsis
- Inorganic Crystal Structures
- Density functional theory calculations of merohedric twinning in KLiSO4
- Low-temperature anharmonicity and symmetry breaking in the sodalite |Na8I2|[AlSiO4]6
- Crystal structure and in vitro antimicrobial activity studies of Robustic acid and other Alpinumisoflavones isolated from Millettia thonningii
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- Organic and Metalorganic Crystal Structures
- Structural features of uranyl acrylate complexes with s-, p-, and d-monovalent metals
- Challenging structure determination from powder diffraction data: two pharmaceutical salts and one cocrystal with Z′ = 2
- Synthesis of CdSe/ZnS@HPU-2 composites for highly sensitive and multicolor florescence response to Fe3+
- Letter
- Structure of solid chlorine at 1.45 GPa
