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Study on high temperature oxidation resistance in air of an austenitic stainless steel microalloyed with cerium welded using MIG welding process with different shielding gases

Grant number: 15/01921-8
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): May 01, 2015
Effective date (End): August 02, 2017
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
Principal Investigator:Jorge Alberto Soares Tenório
Grantee:Débora Arruda Cabral
Home Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated scholarship(s):16/20872-0 - Characterization and thermodynamic study of oxidation on welded austenitic stainless steel microalloyed with cerium, BE.EP.IC

Abstract

The search for alternatives to increase the high temperatures oxidation resistance in air of the materials increases every day due to the need to optimization of the life expectancy of equipment operating in these conditions. New materials designed to work in these conditions make it possible to reduce maintenance costs, increasing productivity of equipment due to reduced shutdowns. The use of austenitic stainless steel microalloyed with rare earth elements is adopted an alternative, for example, to tubes and pipes for the oil and gas industry. This work aims to study the high temperature oxidation resistance in air of welded joints of an austenitic stainless steel microalloyed with cerium. The welded joints are welded using MIG / MAG welding process, depositing weld seams on a sheet of austenitic stainless steel AISI 304L by varying the composition of the shielding gas. Samples of the different welded joints are prepared by cutting with a diamond disk and subjected to high temperatures oxidation testing in thermogravimetric balance. The oxidized specimens will be studied using scanning electron microscope and X-ray diffraction.