Abstract
Acicular ferrite(AF) formation mechanism in a GMA weld metal which is widely used for industry has investigated. Many precipitates (Mn-Al-Ti-O phases) were observed in the much AF-formed samples. The formation mechanism of AF on/around the precipitate was analyzed using TEM line analysis.The analysis results of the inclusion/ferrite interface indicated that both Mn and Ti were present at the edge of the precipitate, and Mn depleted zone (MDZ) was also observed near Mn and Ti rich area. Since MDZ was also found around other compounds such as amorphous and MnS, it is considered that MDZ contributes to the acicular ferrite formation rather than low lattice misfit.
