Abstract
The effect of cobalt and aluminium on the austenite to pearlite transformation in superbainitic steel was investigated. Experimental work showed that the transformation rate of pearlitic and the volume fraction of pearlite both were increased by adding ∼4 wt-%Co and 1·5 wt-%Al to the parent superbainitic steel. The addition of cobalt and aluminium to superbainitic steels desirably accelerated the growth rate of pearlitic microstructure and undesirably reduced the interlamellar spacing of pearlite, resulting in hardness higher than that of the parent steel in the pearlitic condition. Nevertheless, the accelerated pearlitic reaction, as a softening process of superbainitic steels before machining/forming, may make the commercial use of these steels more viable.
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