Characterization and thermodynamic study of oxidation on welded austenitic stainless steel microalloyed with cerium

• Grant number: 16/20872-0
• Support Opportunities: Scholarships abroad - Research Internship - Scientific Initiation
• Start date: December 31, 2016
• End date: March 30, 2017
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Jorge Alberto Soares Tenório
• Grantee: Débora Arruda Cabral
• Supervisor: Antonio José Ramirez Londono
• Host Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Institution abroad: Ohio State University, Columbus, United States
• Associated to the scholarship: 15/01921-8 - 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, BP.IC

Abstract

The development of materials increasingly resistant to corrosion is of fundamental importance for the engineering, since such materials contribute to increased equipment life, reducing maintenance costs and shutdowns. Stainless steels have a very important role in this development, since they are more resistant to corrosion than others. Among the classes of stainless steels, austenitic stainless steels are noted for their good resistance to oxidation at high temperatures and also for good weldability; however, these steels lose their corrosion resistance when exposed to working situations in which thermal cycling occurs. In order to try to minimize or to mitigate the problem caused by thermal cycling, rare earth elements are added to austenitic stainless steels, thus forming microalloyed austenitic stainless steels. The objective of this project is to conduct characterization and thermodynamic study of welded joints of cerium microalloyed austenitic stainless steel which have undergone a welding process MIG / MAG with different shielding gases. The characterization will be performed on samples that have been subjected to tests simulating the same working condition at high temperatures in air. The characterization will be complemented with a thermodynamics study on the oxidation process, which will be carried out using a computational thermodynamic software. Microstructural analysis using optical and scanning electron microscopes will be performed in order to make it possible a quantitative observation of microstructure of samples after testing. (AU)