Formation of Austenite During Intercritical Annealing of Dual-Phase Steels |
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Authors: | G R Speich V A Demarest R L Miller |
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Affiliation: | (1) Research Laboratory, U.S. Steel Corporation, 15146 Monroeville, PA;(2) Department of Materials Science, Cornell University, USA;(3) Research Laboratory, U.S. Steel Corporation, 15146 Monroeville, PA |
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Abstract: | The formation of austenite during intercritical annealing at temperatures between 740 and 900 °C was studied in a series of
1.5 pct manganese steels containing 0.06 to 0.20 pct carbon and with a ferrite-pearlite starting microstructure, typical of
most dual-phase steels.
Austenite formation was separated into three stages: (1) very rapid growth of austenite into pearlite until pearlite dissolution
is complete; (2) slower growth of austenite into ferrite at a rate that is controlled by carbon diffusion in austenite at
high temperatures (~85O °C), and by manganese diffusion in ferrite (or along grain boundaries) at low temperatures
(~750 °C); and (3) very slow final equilibration of ferrite and austenite at a rate that is controlled by manganese diffusion
in austenite. Diffusion models for the various steps were analyzed and compared with experimental results. |
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