ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Decomposition of Coarse Grained Austenite During Accelerated Cooling of C–Mn Steels
M. FerryM. ThompsonP. A. Manohar
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2002 Volume 42 Issue 1 Pages 86-93

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Abstract

The simulation of microstructural evolution of a range of C–Mn steels following high-speed continuous casting and controlled cooling was carried out using quench dilatometry. An initial coarse-grained austenitic microstructure (as expected during casting of low carbon steel strip) was produced by a high temperature austenitising treatment followed by cooling at rates up to 600°C/s. Continuous cooling transformation (CCT) diagrams for a range of cooling schedules were constructed. It was found that both cooling rate and steel composition produces a range of final microstructures from polygonal ferrite to martensite with a concomitant range in hardness. Coarse grained austenite was found to promote the formation of degenerate pearlite and bainitic microstructures. The role of alloying additions, in combination with cooling rate is discussed in the context of microstructural development and mechanical properties of as-cast low carbon steel strip.

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