11th International Rolling Conference (IRC 2019) — Vol. 11, Num. 11 (2019)
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The effect of soaking temperature in the reheating of slabs on the precipitates dissolution and mechanical properties of Ti-Nb microalloyed steel was investigated in pilot scale. It was verified, by means of transmission electron microscopy, a significant decrease in precipitates formed during the solidification of the steel as the soaking temperature increased from 1100°C to 1200°C. No significant changes in size and shape of the precipitates were observed with further temperature increase up to 1280°C. In line with the precipitates dissolution behavior, an increase in mechanical resistance was observed with the elevation of the soaking temperature up to 1200°C, due to the reprecipitation of (Nb,Ti)(C,N) during the rolling/air cooling. After reheating above 1200°C up to 1280°C, it was noticed a decrease in mechanical resistance of the rolled plates. This effect was credited to grain growth. The results were in agreement with Thermo-Calc and Dictra simulations.
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Reheating plates; Precipitates dissolution; Heavy plates.
Como citar
Murari, Fábio Dian; Santos, Antônio Adel dos; Costa e Silva Andre; Rodriguez-Ibabe, José María.
,
p. 98-109.
In: 11th International Rolling Conference (IRC 2019),
São Paulo,
2019.
, DOI 10.5151/9785-9785-32213
