A general crystallographic model of fcc/bcc(bct) martensitic nucleation and growth in steels
YANG Jinbo; YANG Zhigang; QIU Dong; ZHANG Wenzheng; ZHANG Chi; BAI Bingzhe; FANG Hongsheng
Department of Materials Science and Engineering; Tsinghua University; Beijing 100084
Cite this article:
YANG Jinbo; YANG Zhigang; QIU Dong; ZHANG Wenzheng; ZHANG Chi; BAI Bingzhe; FANG Hongsheng. A general crystallographic model of fcc/bcc(bct) martensitic nucleation and growth in steels. Acta Metall Sin, 2005, 41(3): 225-230 .
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 Ms point, the lattice parameter of austenite matrix is √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.
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