Abstract
Abstract The effect of austenite deformation in the recrystallization, partial recrystallization and nonrecrystallization temperature range on the subsequent ferrite transformation was investigated in a commercial HSLA steel with 0.076% Ti and a reference C-Mn steel of same base chemistry. The steel samples were given reductions in the range 20–60% at 850, 950 and 1050°C by single pass rolling followed by isothermal transformation to ferrite at 690°C for up to 1800 s. It was found that the austenite to ferrite transformation rate was increased both with increase in the amount of austenite deformation and lowering the finish rolling temperature. The addition of titanium resulted in decrease in the rate of ferrite formation as well as led to the formation of polygonal ferrite grains. Non-recrystallized elongated austenite grains appear to give fine ferrite structure whilst mixed ferrite grains resulted from partially recrystallized austenite. It was observed that not only the austenite grain boundaries, but...
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