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 Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: May 01, 2015
• End date: August 02, 2017
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Jorge Alberto Soares Tenório
• Grantee: Débora Arruda Cabral
• Host 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.