A general crystallographic model of fcc/bcc(bct) martensitic nucleation and growth in steels

Yang, J. B., Yang, Z. G., Qiu, D., Zhang, W. Z., Zhang, C., Bai, B. Z. and Fang, H. S. (2005) A general crystallographic model of fcc/bcc(bct) martensitic nucleation and growth in steels. Acta Metallurgica Sinica, 41 3: 225-230.

Author Yang, J. B.
Yang, Z. G.
Qiu, D.
Zhang, W. Z.
Zhang, C.
Bai, B. Z.
Fang, H. S.
Title A general crystallographic model of fcc/bcc(bct) martensitic nucleation and growth in steels
Journal name Acta Metallurgica Sinica
ISSN 0412-1961
Publication date 2005
Sub-type Article (original research)
Volume 41
Issue 3
Start page 225
End page 230
Total pages 6
Place of publication Beijing, China
Publisher Science China Press
Language eng
Subject 0912 Materials Engineering
Abstract The crystallography of fcc/bcc(bct) martensite transformation, including nucleation and growth, has been discussed from the viewpoint of invariant-line and O-lattice theory. The formation of martensite is accomplished by the immigration of well-defined glissile interface (121)(fcc) type and its misfit dislocations can produce the lattice invariant deformation (LID) on the basis of phenomenal theory of martensitic crystallography (PTMC), however, LID is retarded slightly after the migration of interphase (121)(fcc), i.e. a thin plate-like zone exists without LID in martensite near the well-defined interface. When the temperature reduces to the M-s point, the lattice parameter of austenite matrix is root 3/2 times that of the martensite without LID. This critical condition for spontaneous transformation agrees with that the stack fault energy in matrix is less than zero according to Olson and Cohen's nucleation model.
Keyword Metallurgy & Metallurgical Engineering
martensite
phenomenal theory of martensitic crystallography (PTMC)
invariant line
O-lattice theory
nucleation and growth
Phase-transformations
O-lattice
Mechanism
Precipitation
Systems
Bainite
Planes
Alloy
Line
Fcc
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Mechanical & Mining Engineering Publications
 
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