Abstract
The effect of cobalt on bainite kinetics formation in a 1C-1.5Si wt pct steel is investigated. Two laboratory casts were manufactured with no or 2.5Co wt pct. Bainite transformation kinetics at 493 K, 523 K, and 573 K (220 °C, 250 °C, and 300 °C) were measured using dilatometry. Careful control of the alloy composition, in particular with respect to carbon content, allowed unambiguous identification of the expected accelerating effect of Co. This effect was quantified and compared to that of other possible alloying additions. It is shown that Co has an acceleration effect of around 18 to 29 pct (per wt pct added) for bainite formation between 220 °C and 300 °C. Comparison with published data indicates that this influence is orders of magnitude smaller than that achieved through reduction of C, Mn, or Cr. The influence on hardness is quantified and shown to be significant, and possible origins for hardening are discussed.
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