Abstract
The effect of carbon on the plastic strain ratio of low-carbon dual-phase steels was investigated in a series of low C-1.6 Mn-0.3Cr-0.2Mo-0.001B steels with carbon contents ranging from 0.021 to 0.048%. The rm value of dual-phase steel could be increased by controlling both the carbon content and the martensite morphology. The highest rm value of 1.23 was obtained in 0.021% C steel annealed at 790 °C according to the typical galvannealing heat cycle. The martensite volume fraction was 5.4%, which was sufficient to eliminate the yieldpoint elongation in as-annealed steel, and this had little deteriorating effect on the rm value. The fine martensite particles between 0.5 μm and 2.0 μm in size were desirable for a high rm value in dual-phase steel.
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