| Full text | |
| Author(s): |
Soares Azevedo e Silva, Paulo Ricardo
[1]
;
Baldan, Renato
[1]
;
Nunes, Carlos Angelo
[1]
;
Coelho, Gilberto Carvalho
[1, 2]
;
da Silva Costa, Alex Matos
[1]
Total Authors: 5
|
| Affiliation: | [1] Univ Sao Paulo, EEL, Dept Engn Mat DEMAR, BR-12600970 Sao Paulo - Brazil
[2] UniFoa, Ctr Univ Volta Redonda, Nucleo Pesquisa, BR-27240560 Rio De Janeiro - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | MATERIALS CHARACTERIZATION; v. 75, p. 214-219, JAN 2013. |
| Web of Science Citations: | 11 |
| Abstract | |
MAR-M247 superalloy has excellent mechanical properties and good oxidation resistance at elevated temperatures. Niobium is an element known as gamma' phase hardener in nickel-based superalloys, besides promoting homogeneous distribution of MC carbides. This work is inserted in a project that aims to evaluate the total replacement of tantalum by niobium atoms in MAR-M247 superalloy (10.2 Co, 10.2 W, 8.5Cr, 5.6 Al, 1.6 Nb, 1.4 Hf, 1.1 Ti, 0.7 Mo, 0.15 C, 0.06 Zr, 0.015 13, Ni balance-wt.%). Based on microstructural characterizations (SEM and FEG-SEM, both with EDS) of the as-cast material and heat-treated materials as well as utilizing Thermocalc simulations and experiments of differential thermal analysis (DTA), heat-treatment at 1260 degrees C for 8 h was chosen as an ideal condition for the solution of Nb-modified MAR-M247 superalloy. The hardness of as-cast and ideally solution treated materials was 390 +/- 14 HV and 415 +/- 6 HV, respectively. (C) 2012 Elsevier Inc. All rights reserved. (AU) | |
| FAPESP's process: | 09/17337-2 - Heat-treatment and microstructural characterization of Nb-modified MAR-M247 superalloy |
| Grantee: | Paulo Ricardo Soares Azevedo e Silva |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |