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Oxidation Behavior of the Niobium-Modified MAR-M247 Superalloy at 1,000 °C in Air

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Abstract

MAR-M247 superalloy has excellent mechanical properties and oxidation resistance. The aim of this work was to evaluate the oxidation behavior of a Nb-modified MAR-M247 superalloy (10.2 wt% Co; 10.2 W; 8.5 Cr; 5.6 Al; 1.6 Nb; 1.4 Hf; 1.1 Ti; 0.7 Mo; 0.15 C; 0.06 Zr; 0.02 B; Ni balance). The samples were subjected to oxidation tests in air at 1,000 °C up to 240 h and the weight gain was measured every 24 h. The material in the as-cast condition as well as those from the oxidation tests were characterized with the aid of SEM/EDS and X-ray diffraction (XRD). The results showed that the n value and the parabolic rate constant (k) for the MAR-M247(Nb) superalloy at 1,000 °C were about 0.1 and 2.8 × 10−8 mg2cm−4s−1, respectively. The microstructural characterization showed the formation of NiO oxides in the outer layer, Cr2O3, TiO2, CoO, (Ni,Co)Cr2O4 spinels, W20O58 and HfO2 particles in the intermediate layer and Al2O3 in the inner layer and in the γ’ depleted zone of the material.

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Authors and Affiliations

  1. Escola de Engenharia de Lorena (EEL), Departamento de Engenharia de Materiais (DEMAR), Universidade de São Paulo (USP), Estrada Municipal do Campinho, s/n, Bairro Campinho, Lorena, São Paulo, 12602-810, Brazil

    Renato Baldan, Renata Guimarães, Carlos Angelo Nunes & Gilberto Carvalho Coelho

  2. Núcleo de Pesquisa, UniFoa – Centro Universitário de Volta Redonda, Campus Três Poços, Avenida Paulo Erlei Alves Abrantes, 1325 – Bairro Três Poços, Volta Redonda, Rio de Janeiro, 27240-560, Brazil

    Sinara Borborema Gabriel & Gilberto Carvalho Coelho

  3. Departamento de Engenharia Metalúrgica e de Materiais, Universidade Federal do Rio de Janeiro, C.P. 68505, Rio de Janeiro, Rio de Janeiro, 21945-970, Brazil

    Sinara Borborema Gabriel

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  1. Renato Baldan
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  2. Renata Guimarães
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  3. Carlos Angelo Nunes
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  4. Sinara Borborema Gabriel
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  5. Gilberto Carvalho Coelho
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Correspondence to Renato Baldan.

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Baldan, R., Guimarães, R., Nunes, C.A. et al. Oxidation Behavior of the Niobium-Modified MAR-M247 Superalloy at 1,000 °C in Air. Oxid Met 83, 151–166 (2015). https://doi.org/10.1007/s11085-014-9517-0

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  • DOI: https://doi.org/10.1007/s11085-014-9517-0

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