Actions for Austenite to ferrite transformation kinetics during continuous cooling [electronic resource].

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Austenite to ferrite transformation kinetics during continuous cooling [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1994.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
7 pages : digital, PDF file
Additional Creators
United States. Department of Energy and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The austenite decomposition has been investigated in a hypo-eutectoid plain carbon steel under continuous cooling conditions using a dilatometer and a Gleeble 1500 thermomechanical simulator. The experimental results were used to verify model calculations based on a fundamental approach for the dilute ternary systems Fe-C-Mn. The austenite to ferrite transformation start temperature can be predicted from a nucleation model for slow cooling rates. The formation of ferrite nuclei takes place with equilibrium composition on austenite grain boundaries. The nuclei are assumed to have a pill box shape in accordance with minimal interfacial energy. For higher cooling rates, early growth has to be taken into account to describe the transformation start. In contrast to nucleation, growth of the ferrite is characterized by paraequilibrium; i.e. only carbon can redistribute, whereas the diffusion of Mn is too slow to allow full equilibrium in the ternary system. However, Mn segregation to the moving ferrite-austenite interface has to be considered. The latter, in turn, exerts a solute drag effect on the boundary movement. Thus, growth kinetics is controlled by carbon diffusion in austenite modified by interfacial segregation of Mn. Employing a phenomenological segregation model, good agreement has been achieved with the measurements.
Report Numbers
E 1.99:egg-m--94205
E 1.99: conf-940704--5
conf-940704--5
egg-m--94205
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
12/31/1994.
"egg-m--94205"
" conf-940704--5"
"DE95008582"
International conference on solid-to-solid phase transformations in organic materials, Pittsburgh, PA (United States), 17-22 Jul 1994.
Militzer, M.; Pandi, R.; Hawbolt, E.B.
EG and G Idaho, Inc., Idaho Falls, ID (United States)
Funding Information
FC07-93ID13205
View MARC record | catkey: 14453799