Abstract
The formation and growth behavior of inclusions in the liquid steel were studied based on 45 steel by virtue of high temperature confocal laser scanning microscope. The structures of all kinds of complex inclusions formed in the process of cooling and solidification of liquid steel were analyzed, and disregistries between various inclusions were calculated. The results showed that inclusions with high melting point precipitated firstly, and inclusions with low disregistries precipitated later. The latter precipitated and grew up on the surface of the former, and finally clear layered complex inclusions formed. The low disregistry mechanism could not fully explain the forming reasons of all complex inclusions, but no matter which kind of mechanism leading to the formation of complex inclusions, its basic principle is that the first precipitated phase provides a low nuclear power interface for the latter, which can reduce the nucleation interface and strain energy barrier of the latter.
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