Banca de DEFESA: VINICIUS DE TOLÊDO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : VINICIUS DE TOLÊDO
DATE: 30/04/2024
TIME: 14:00
LOCAL: sala 134
TITLE:

Influence of cold deformation and the thermal welding cycle on the corrosion of AISI 439 stainless steel in saline environments

KEY WORDS:

AISI 439 stainless steel, cold deformation, thickness reduction, TIG welding, corrosion resistance.

PAGES: 119
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUMMARY:

Ferritic stainless steels have specific applications due to their high resistance to corrosion and high mechanical strength. In the typical manufacturing processes of stainless-steel products, mechanical forming techniques are employes, such as, lamination and stamping, and joining techniques, mainly welding. In this study the relationship between cold deformation and between the joining processes of material by welding and the resistance to corrosion of AISI 439 will be evaluated since there was a lack of research in this context and great industrial demand for the production of this material. For the methodological procedure, a commercial AISI 439 stainless steel plates with 3 mm thickness will be used. Specimens will be additional shaped by cold rolling with a thickness reduction up to 50%. The specimens will be subjected to a thermal welding cycle simulating a real TIG application condition. After these steps, the samples will be characterized by Vickers hardness and metallographic test. For analysis of the corrosive properties, potentiodynamic polarization tests and electrochemical impedance spectroscopy will be used. It is observed that cold deformation changes the microstructure of the material, which presents elongated grains in the direction of lamination and this structure affects corrosion resistance, being this effect more pronounced at certain levels of deformation. However, welding has a greater influence on the corrosive process, creating regions with heterogeneous microstructure in terms of grain size and making the steel more susceptible to corrosion.

COMMITTEE MEMBERS:
Presidente - MARCELLO ROSA DUMONT
Interna - ELAINE CARBALLO SIQUEIRA CORREA
Interno - CLAUDIO TURANI VAZ
Externo à Instituição - FERNANDO COTTING - UFMG