Crystallography and interface boundary structure of pearlite with M{sub 7}C{sub 3} carbide lamellae
- Ehime Univ., Matsuyama (Japan). Dept. of Materials Science and Engineering
The crystallography of pearlite with M{sub 7}C{sub 3} carbide lamellae and the atomic structure at the ferrite/carbide interface have been examined by means of transmission electron microscopy in an Fe-8.2Cr-0.96C alloy. Two orientation relationships with the corresponding habit planes were determined: OR-I: ({bar 2}{bar 5}1){sub b}{parallel}(11{bar 2}0){sub hex}--habit plane, ({bar 1}13){sub b}{parallel}({bar 1}100){sub hex}, ({bar 3}1{bar 1}){sub b} {approx} {parallel}(0001){sub hex}; OR-II: ({bar 2}{bar 5}1){sub b}{parallel}(1{bar 1}00){sub hex}--habit plane, ({bar 1}13){sub b}{parallel}(11{bar 2}0){sub hex} ({bar 3}1{bar 1}){sub b} {approx} {parallel}(0001){sub hex}. Variants of these orientation relationships have been frequently observed. Microscopic steps at the ferrite/carbide interfaces accommodate the curvature of the habit planes. Each of these orientation relationships provides a small misorientation between the {l_brace}110{r_brace}{sub b} close packed planes of ferrite and the coincident planes of M{sub 7}C{sub 3} carbide, and the atomic planes are perfectly matched through the interface. The orientation relationship between the parent austenite and M{sub 7}C{sub 3} carbide was also deduced assuming the ferrite/austenite orientation relationship so far obtained.
- OSTI ID:
- 338418
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 4 Vol. 47; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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