Synopsis Dual phase structure in an HSLA steel containing 1 % Cr and 0.2 % V was produced by cooling from austenite field to the (a+r) region, then quenching in iced brine. The quenched steels were tempered at 700 °C. Linear equations were proposed to express the effect of martensite volume fraction and tensile strength on uniform elongation, products of tensile strength and uniform or total elongation. Cleavage and/or void coalescence was the operating mode of fracture for quenched steels,

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... eas void coalescence was the main mechanism after tempering. The size of the voids was found to be affected by the steel plasticity.