Transformation of the δ-Ferrite in SS2343 Austenitic Stainless Steel upon Annealing at 1050 °C, 1150 °C and 1250 °C

The solidification behaviors of laboratory cast austenitic SS2343 stainless steel in terms the volume fraction δ-ferrite as-cast state and its transformation after subsequent annealing were investigated. Monitoring morphological transformations microstructure show progress dissolution. Annealing tests conducted at 1050 °C, 1150 °C 1250 with soaking times 5 40 min. thermodynamic prediction metallographic identification are presented. ferrite fractions measured using a magnetic method determined to be range between 10.7% 14.6%. share decreased an increase temperature time annealing. About 50–55% was effectively transformed. phase, originally present dendritic morphology, tends break up spheroidize. morphology varies from vermicular, lacy acicular shapes globular for higher temperatures longer exposure times. In annealing, concentrations Cr Mo decrease, conversely concentration Ni increase, all by small, but significant, amounts. observed changes solute can explained into austenite sigma phases.