Formation of austenite in 1.5 pct Mn steels |
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Authors: | C I Garcia A J Deardo |
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Affiliation: | (1) Department of Metallurgical and Materials Engineering, University of Pittsburgh, Pittsburgh, PA |
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Abstract: | The formation of austenite from different microstructural conditions has been studied in a series of 1.5 pct Mn steels that
had been heated in and above the intercritical (α+ γ) region of the phase diagram. The influence of variables such as cementite morphology, initial structural state of the ferrite
and the carbon content has been assessed in terms of their respective effects on the kinetics of austenite formation and final
microstructure. Austenite was found to form preferentially on ferrite-ferrite grain boundaries for all initial structures.
The results of this study have shown that the 1.5 pct Mn has lowered both the AC3 and AC1, lines causing large amounts of austenite to form in low carbon steel. The kinetics of austenite formation at 725 °C were
not only very slow but also were approximately independent of the amount formed. Austenite appeared to form slightly more
rapidly from cold rolled ferrite than from recrystallized ferrite or ferrite-pearlite structures. |
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