Banca de QUALIFICAÇÃO: ANDRÉ LUÍS SILVA GABRIEL

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : ANDRÉ LUÍS SILVA GABRIEL
DATA : 25/04/2019
HORA: 14:00
LOCAL: Sala 151 - DEMAT
TÍTULO:

CHARACTERIZATION OF THE SAF 2205 DUPLEX STAINLESS STEEL TUBES OBTAINED BY MECHANICAL FORMING AND LASER WELDED

PALAVRAS-CHAVES:

The SAF 2205 duplex stainless steel. Mechanical forming. Laser welding. Oxidation.

PÁGINAS: 65
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Metalurgia de Transformação
ESPECIALIDADE: Soldagem
RESUMO:

The SAF 2205 duplex stainless steel are materials widely used in industries which require high corrosion resistence and relevant mechanical properties during the operation. Characterized by a biphase microstructure, composed by a ferritic-austenitic matrix with concentrations in order of 50% for both. The SAF 2205 duplex stainless steel is being widely used in petroleum and gas industries around the world. However, there are still great uncertaints on the use of the laser welding process in industrial scale, related to the mechanical forming this kind of material can suffer during its application. The wrong thermal input can cause undesirable phases at the SAF 2205 duplex stainless steel, as well as the precipitation of carbides and the sigma phase at the material structure, both very harmful to the metal structure. In situations related to oxidation, when there is the passive layer break, the SAF 2205 duplex stainless steel can suffer permanent damage in its microstructure, causing the formation of pites in its surface and in more severe conditions, the intergranular corrosions. Thus, this work aims at characterizing the material in a natural condition, comparing the results to a situation where the material is mechanically forming and after that passes by the laser welding process, assessing the influence of these processes on the microstructural alterations, as well as on the material corrosion resistence. 

MEMBROS DA BANCA:
Presidente - IVETE PEIXOTO PINHEIRO SILVA - CEFET-MG
Interno - CLAUDIO TURANI VAZ
Interno - SIDNEY NICODEMOS DA SILVA
Externo ao Programa - ALMIR GONCALVES VIEIRA