Relationship Between Hot Ductility Behavior and Microstructural Changes in TP347 Stainless Steel

摘要

This research evaluated the relationship between ductility behavior and metallurgical changes in the TP347 austenitic stainless steels. Microstructural examinations clearly revealed that the hot ductility behavior was mainly controlled by the competition between the softening process (dynamic recrystal-ization) and the degree of grain boundary wetting due to incipient melting and constitutional liquation of precipitates. The on-cooling fracture mode was intergran-ular, and cracks propagated along prior melted and resolidified boundaries which were rich in impurities and decorated by the products of the precipitate-austenitic eutectic reaction.