Effects of Mn and Al on Acicular Ferrite Formation in SAW Weld Metal
Naoto Fujiyama, Genichi Shigesato
Abstract
The acicular ferrite (AF) formation behaviors of submerged arc weld metals with various Al/O ratios and Mn contents were investigated. The nucleation sites of AF consisted of inclusions surrounded by a TiO layer. The Al/O ratio affected the number of inclusions that acted as AF nucleation sites. At high Al/O ratios, the number of inclusions was low and the microstructure was coarse.
Topics & Concepts
Acicular ferriteNucleationMaterials scienceMetallurgyMicrostructureAcicularNon-metallic inclusionsFerrite (magnet)MetalComposite materialBainiteChemistryAusteniteOrganic chemistryAdvanced Welding Techniques AnalysisAluminum Alloy Microstructure PropertiesMicrostructure and mechanical properties