Title

THE EFFECT OF SOAKING TEMPERATURE ON THE DISSOLUTION OF PRECIPITATES AND ON THE MECHANICAL PROPERTIES OF MICROALLOYED STEEL HEAVY PLATES

DOI

10.5151/9785-9785-32213

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Abstract

 

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.

Keywords

Reheating plates; Precipitates dissolution; Heavy plates.

How to refer

Murari, Fábio Dian; Santos, Antônio Adel dos; Silva, André Luiz Vasconcellos da Costa e; Rodriguez-Ibabe, José María. THE EFFECT OF SOAKING TEMPERATURE ON THE DISSOLUTION OF PRECIPITATES AND ON THE MECHANICAL PROPERTIES OF MICROALLOYED STEEL HEAVY PLATES , p. 98-109. In: 11th International Rolling Conference (IRC 2019), São Paulo, 2019.
ISSN: - , DOI 10.5151/9785-9785-32213