Abstract
This study has been conducted to confirm the formation of TiN phase in the electrogas (EG) weld metal and, if it formed, to identify the nucleation potency of TiN for acicular ferrite. To facilitate this, a high-nitrogen EG weld meal deposited using a very high heat input was chosen. Inclusion analyses were mostly carried out in a scanning electron microscope (SEM) and analytical transmission electron microscope (TEM) equipped with energy dispersive analyzer (EDS) and electron energy loss spectroscopy (EELS). It was confirmed that the inclusions were nearly fully covered by TiO layer alloyed with a small amount of nitrogen, this TiO layer being partly coated with TiN phases having two different types of morphology: layer-type or patch-type. The layer-type was identified to be nearly pure TiN, being formed with a thickness of 10 nm on the outer surface of thick TiO layer. The patch-type appeared to be formed on the TiN/TiO layer and was characterized by its fine lamellar mixture of TiN and (Al,Mn)-oxide. As all these phases formed on the inclusion surface, they were suspected to influence the nucleation potency of inclusions but the relative potency of these phases to TiO layer was not clearly understood.
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