Modification of MAR-M246 superalloy by Nb addition: phase stability and mechanical behavior

• Grant number: 15/09257-0
• Support Opportunities: Regular Research Grants
• Start date: September 01, 2015
• End date: February 28, 2018
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Carlos Angelo Nunes
• Grantee: Carlos Angelo Nunes
• Host Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil
• Associated researchers: Adriano Gonçalves dos Reis ; Danieli Aparecida Pereira Reis ; Gilberto Carvalho Coelho ; Renato Baldan

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, in particular, to reevaluate the existent commercial alloys, through data acquisition in extreme conditions. This innovator postdoctoral project aims to evaluate and correlate the microstructure and mechanical behavior (through creep tests) of the conventional and niobium-modified MAR-M246 nickel-based superalloys. The alloys will be performed to solution and aging heat-treatments at different times and temperatures, hardness measurements, differential thermal analysis, creep tests in constant load at 750, 800 and 850°C. The strength range will be determined through high temperature tensile tests. The curves will allow obtaining the experimental parameters of primary, secondary and tertiary regions as function of tensile and temperature applied. Ductility, stationary creep rate and lifetime of the alloy will be evaluated. The results of the microstructural characterization and the creep curves will be compared with Thermo-Calc and JMatPro simulations in order to validate the results and the software database. Finally, microstructural characterization, through optical, scanning and transmission electron microscopy will be useful for the interpretation of the creep mechanisms that act in the material. (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)

ALKMIN, L. B.; UTADA, S.; CHAIA, N.; REIS, D. A.; COELHO, G. C.; CORMIER, J.; NUNES, C. A.. Creep behavior of conventional and Nb-modified as-cast MAR-M246 superalloy. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v. 813, MAY 5 2021. (15/09257-0)