Per: erica Marcelino Freitas de Souza Silva (UNIVERSIDADE FEDERAL FLUMINENSE ), GLAUCIO SOARES DA FONSECA (UNIVERSIDADE FEDERAL FLUMINENSE), Lucas Rosate Leite dos Santos (UNIVERSIDADE FEDERAL FLUMINENSE)
Abstract:
Austenitic Stainless Steels (ASS) are widely used not only due your good corrosion resistence, but because they are widely conformable, manufacturable, lasting and weldable by almost all welding process. At room temperature, homogeneous wrought alloys of this type are usually completely austenitic However for many aplications this alloys require to be subjected a metallurgical process like welding, that can cause microstructural changes. Therefore an alloy that before was completely austenitic, can now present fraction of retained delta ferrite. The present work investigates the influence of heat input on an evolution of the ASS 316L weld microstructure subjected to similar welding in two different heat input by autogenous TIG process. The welded sample microstructure analysis carried out by optical microscopy. The results allowed to conclude that heat input really affected on a final 316L microstructure, because, after de welding, for both heat input applied the microstructure was composes of austenite and delta ferrite and not only by austenite predominance like early present the metal base