The recent trend to upgrade the mechanical properties of the low alloy
structure steel is to generate the well known acicular ferrite
morphology by addition of special alloying element as Micro-alloying to
affect nano-size substructure. It was agreed that the key point for
developing the oxide metallurgy technology is to continuously explore
the potential oxides which can induce ferrite formation. Moreover, much
attention had been paid to study the nucleation mechanisms of IAF
nucleated on different inclusions. However, the IAF nucleation
mechanisms are poorly understood. The intention of the present work is
to help to a deeper understanding of the mechanism of acicular ferrite
nucleation in some microallyed steel such as Ti, Al, and Mg-microalloyed
steel, which were investigated by the Author and others, aimed to
optimize strength and toughness of the structure steel based on the
mechanism of acicular ferrite formation.