Mechanical properties of low carbon-vanadium microalloyed quenched and tempered steels vvith aluminium additions

Abstract

The mechanical properties of Fe–0·1 C–1·5Mn–0·05V steels with varying Al contents (0·04–0·35 wt-%) were examined in the tempered condition. After hot rolling, the steels were solution treated at 1200°C for 2 h, then quenched into water. Tempering was mainly carried out at 600 or 650°C for 1 h. Hardness, tensile strength, and Charpy toughness were studied and compared with the microstructure. The precipitates were measured and identified using transmission electron microscopy and energy dispersive X-ray analysis. It wasfound that the precipitation ofVC was at a minimum in the steel containing 0·13%Al, and it is suggested that the precipitation of VC or V (C, N) was retarded at this level of Al addition. The tensile strength and lower ductile-brittle transition temperature decreased to their minimum values in the samples containing 0·1–0·15%Al, which was also believed to be a result of less VC or V(C,N) precipitation giving benefits of increased toughness and a decrease in the transition temperature.

MST/3098

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