Abstract
The effect of Ti and La complex treatment on the formation and evolution of inclusions in high‐Al transformation‐induced plasticity steel is investigated by laboratory experiments and thermodynamic calculations, with consideration given to the amount of La added and the sequence of the addition of Ti. The main inclusions are Al2O3 and AlN inclusions before the Ti and La additions. The AlN inclusions are transformed into TiN inclusions with the addition of 0.1 wt% Ti. After the subsequent addition of 0.007 wt% La, the main inclusions are LaAlO3, La2O2S, and TiN. With the addition of 0.06 wt% La to molten steel, the main inclusions are La2O2S, La2S3, and TiN. La may prevent the precipitation of TiN inclusions. Different addition sequences of Ti and La result in the same types of inclusions, with higher La addition. In the case of La addition before Ti, Ti can restrain the formation of La‐containing inclusions, and the number density of inclusions increases.
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