Microstructural characterization, isothermal and cyclic oxidation resistance at high temperatures of conventional and Nb-modified MAR-M246 superalloys

• Grant number: 18/07802-9
• Support type: Regular Research Grants
• Duration: October 01, 2018 - March 31, 2021
• Field of knowledge: Engineering - Materials and Metallurgical Engineering
• Principal Investigator: Renato Baldan
• Grantee: Renato Baldan
• Home Institution: Universidade Estadual Paulista (UNESP). Campus Experimental de Itapeva. Itapeva , SP, Brazil
• Assoc. researchers: Artur Mariano de Sousa Malafaia ; Carlos Angelo Nunes ; Sinara Borborema
• Associated scholarship(s): 19/17526-1 - Isothermal and cyclic oxidation behavior of conventional and Nb-modified MAR-M246 superalloys, BP.TT

Abstract

Materials applied at high temperatures and severe environments became a scientific and technologic requirement nowadays. Literature relates studies that have been done independent of commercial objectives to improve the development of new alloys and to reevaluate the existent commercial alloys, through data acquisition in extreme conditions. Superalloys have many alloying elements in appreciable amounts. Among them, what deserves national prominence is niobium, since Brazil is the largest producer of niobium ore and has the largest niobium mineral reserve in the world. This project aims to evaluate and correlate the microstructure and mechanical behavior of the conventional (tantalum) and niobium-modified (replacing tantalum atoms with niobium atoms, since both have similar physical and chemical properties) MAR-M246 nickel-based superalloys. The isothermal and cyclic oxidation tests will be performed under different temperature and time conditions. Thermodynamic simulations using JMatPro software will allow understanding the phases present in the microstructure and the oxidation mechanisms of superalloys. The results obtained will allow to analyze, understand and verify the viability of replacement of tantalum by niobium in the microsctructure, oxidation behavior during isothermal and cyclic oxidation and mechanical properties of the superalloys. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DE SOUSA MALAFAIA, ARTUR MARIANO; DE OLIVEIRA, RAFAELA BRINO; LATU-ROMAIN, LAURENCE; WOUTERS, YVES; BALDAN, RENATO. Isothermal oxidation of Inconel 625 superalloy at 800 and 1000 degrees C: Microstructure and oxide layer characterization. MATERIALS CHARACTERIZATION, v. 161, MAR 2020. Web of Science Citations: 0.

RENATO BALDAN; ANTONIO AUGUSTO ARAUJO PINTO DA SILVA; TIEMI MANFIO TANNO; ELIARA TORRES DA COSTA; JOÃO VICTOR NEGRI BRENTEGANI; ANTONIO AUGUSTO COUTO. Experimental Investigation of Delta Phase Precipitation in Inconel 625 Superalloy Aged at 550, 625 and 725 °C. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 23, n. 1, p. -, 2020.

BALDAN, RENATO; ARAUJO PINTO DA SILVA, ANTONIO AUGUSTO; TONNO, TIEMI MANFIA; DA COSTA, ELIARA TORRES; NEGRI BRENTEGANI, JOAO TICTOR; COUTO, ANTONIO AUGUSTO. Experimental Investigation of Delta Phase Precipitation in Inconel 625 Superalloy Aged at 550, 625 and 725 degrees C. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 23, n. 1 2020. Web of Science Citations: 0.