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Influence of titanium on transformation behaviour during continuous cooling of boron microalloyed steels

ABSTRACT Continuous cooling transformation (CCT) characteristics and prior-austenite grains of boron microalloyed steels with and without titanium were investigated to obtain the necessary information for heat treatment of these steels. Transformation characteristics were determined by using dilatometer tests, microscopic observation, and hardness measurements. In addition, the effects of titanium addition on the sizes of prior-austenite grains and precipitates were analysed. The results show that the changes in austenite grain size are not very distinct, and adding titanium only slightly refines the austenite grains. The CCT diagrams showed that the ranges of transformation products were shifted to the right side by the addition of titanium. The ferrite transformation starting temperatures were reduced on addition of titanium. Titanium addition induced decreased critical cooling rates for bainite transformations. The hardenability of boron microallyed steel is increased by adding titanium because more boron segregate to prior-austenite grain boundaries.