Journal of Materials Engineering and PerformanceĬontains carbides and the gamma (c)-gamma prime (c¢), eutectic, as well as the nickel-based matrix which is strengthened by solid-state precipitated c¢ phase (Ref 3). Lineu Prestes, 2242, Cidade Universita´ria, 05508-000 Sa˜o Paulo, Brazil Sinara Borborema Gabriel, Faculdade de Tecnologia de Resende, UERJ – Universidade do Estado do Rio de Janeiro, Rodovia Presidente Dutra km 298 (sentido RJ-SP) Po´lo Industrial, 27537-000 Resende, Rio de Janeiro, Brazil and Luciano Braga Alkmin, Campus Angra dos Reis, CEFET-RJ - Centro Federal de Educac¸a˜o Tecnolo´gica Celso Suckow da Fonseca, Rua do Areal, 522, 23953-030 Angra dos Reis, Rio de Janeiro, Brazil. Renato Baldan, Sa˜o Paulo State University (Unesp), Campus of Itapeva, Rua Geraldo Alckmin 519, Itapeva, Sa˜o Paulo, 18409-010, Brazil Antonio Augusto Arau´jo Pinto da Silva, Instituto de Engenharia Mecaˆnica - IEM, Universidade Federal de Itajuba´ UNIFEI, Avenida BPS 1303, Itajuba´, MG 37500-903, Brazil Carlos Angelo Nunes, Escola de Engenharia de Lorena (EEL), Departamento de Engenharia de Materiais (DEMAR), Universidade de Sa˜o Paulo (USP), Estrada Municipal do Campinho, Lorena, Sa˜o Paulo 12602-810, Brazil Antonio Augusto Couto, Instituto de Pesquisas Energe´ticas e Nucleares (IPEN), Av. A variant alloy, called MAR-M246 (Hf), contains 1.5 wt.% hafnium, which is added as a carbide former and grain boundary strengthener. The MAR-M246 superalloy generally solidifies with a dendritic structure containing carbides and exhibits extensive interdendritic segregation. The density of MAR-M246 superalloy is 8.44 g/cm3 and the melting range is between 13, (Ref 2). This superalloy has been widely employed in rotors of automotive turbochargers and in high-pressure turbo pumps (Ref 1). Introduction The MAR-M246 is a polycrystalline nickel-cobalt-tungsten superalloy developed by Martin Marietta Corporation, which became part of Lockheed Martin Inc. KeywordsĪging, heat-treatment, MAR-M246, microstructure, solution, superalloyġ. However, a significant increasing in the c¢ particles was observed at 980 ☌, evidenced by the large mean size of these particles after 80 h of aging heat-treatment. The mean c¢ size of aged samples at 780 and 880 ☌ for 5, 20 and 80 h did not present significant differences when compared to the solutioned sample. The results have shown that the sample solutioned at 1250 ☌ for 330 min showed a very homogeneous c matrix with carbides and cubic c¢ precipitates uniformly distributed. The c¢ size precipitated in the aged samples was measured and compared with JMatPro simulations. The as-cast and heattreated samples were characterized by SEM/EDS and SEM-FEG. The c¢ solvus, solidus and liquidus temperatures were calculated with the aid of the JMatPro software (Ni database). The aim of this work is to evaluate the microstructure of the MAR-M246 nickel-based superalloy solutioned at 12 ☌ for 330 min and aged at 780, 880 and 980 ☌ for 5, 20 and 80 h.
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Read the Readme.txt file in the Crack folder.Solution and Aging of MAR-M246 Nickel-Based Superalloy Renato Baldan, Antonio Augusto Arau´jo Pintoda Silva, Carlos Angelo Nunes, Antonio Augusto Couto, Sinara Borborema Gabriel, and Luciano Braga Alkmin (Submitted Jin revised form September 23, 2016) Solution and aging heat-treatments play a key role for the application of the superalloys. Burnout simulation tool, pressure flow analysis.Physical properties during freezing (enthalpy, specific heat, latent heat, density, thermal expansion, volume change, thermal conductivity, electrical conductivity).Heat treatment without calculations: Infrastructure and power calculations.Phase transformations: TTT and CCT diagrams, Simultaneous deposition of carbide in steel, Isothermal evolution.Physical properties: thermal expansion coefficient, linear, thermal conductivity, electrical conductivity and resistance, liquid viscosity, surface tension.Temperature calculations, step concentration, low stability phase.Different types of materials including: aluminum alloys, magnesium, iron, titanium, nickel, cobalt, zirconium and solder.Extend existing properties to other materials.Powerful information management interface to browse through calculated properties.