Microstructural and Mechanical Characterization of Directionally Solidified Conventional and Nb-Modified Mar-M247 Superalloy (2019)
- Authors:
- Autor USP: NUNES, CARLOS ANGELO - EEL
- Unidade: EEL
- DOI: 10.1007/s11665-019-04014-1
- Assunto: TERMODINÂMICA
- Keywords: Mar-M247 superalloy; Nb-modified Mar-M247; thermodynamic simulation
- Agências de fomento:
- Language: Inglês
- Abstract: This study analyzes the effects of replacing Ta by Nb (at.% basis) in the phase transformation temperatures, Scheil solidification behavior, and microstructural mechanical features of a Nb-modified as well as conventional Mar-M247 superalloys. Both alloys were directionally solidified at a withdrawal rate of 18 cm/h under a thermal gradient of about 80 °C/cm. DSC results were compared to thermodynamic simulations of phase transformation temperatures and showed a good correlation. The replacement of Ta by Nb has not altered the solidification path of Mar-M247, keeping the sequence L → L + γ → L + γ + MC → L + γ + MC + γ/γ′ eutectic. Due to the segregation of Hf and Zr to the very last liquid to solidify, a low melting point γ/Ni5(Hf,Zr) constituent was observed. The as-solidified microstructures of both Mar-M247(Nb) and Mar-M247 were constituted of columnar dendrites of gamma matrix (γ) phase with cuboidal gamma-prime (γ′) precipitates. In addition, γ/γ′-eutectic was observed in the interdendritic region along with MC carbides in blocky, script (blocky dendritic), needle-like and fine nodular morphologies. Both alloys contained about 1.5 vol.% of MC carbides. The MC carbides in Mar-M247(Nb) and Mar-M247 are, respectively, Nb-rich and Ta-rich, with only a limited amount of Hf being detected in the MC phase. The yield stress of Nb-modified Mar-M247 showed higher values up to 750 °C. For higher temperatures, above 800 °C, a conventional Mar-M247 presented a higher value of yield stress.
- Imprenta:
- Source:
- Título: Journal of materials engineering and performance
- ISSN: 10599495
- Volume/Número/Paginação/Ano: v.28, p. 2427–2438, 2019
- Este periódico é de assinatura
- Este artigo NÃO é de acesso aberto
- Cor do Acesso Aberto: closed
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ABNT
COSTA, A. M. S. et al. Microstructural and Mechanical Characterization of Directionally Solidified Conventional and Nb-Modified Mar-M247 Superalloy. Journal of materials engineering and performance, v. 28, p. 2427–2438, 2019Tradução . . Disponível em: https://doi.org/10.1007/s11665-019-04014-1. Acesso em: 27 dez. 2025. -
APA
Costa, A. M. S., Lopes, E. S. N., Contieri, R. J., Caram, R., Baldan, R., Fuchs, G. E., & Nunes, C. A. (2019). Microstructural and Mechanical Characterization of Directionally Solidified Conventional and Nb-Modified Mar-M247 Superalloy. Journal of materials engineering and performance, 28, 2427–2438. doi:10.1007/s11665-019-04014-1 -
NLM
Costa AMS, Lopes ESN, Contieri RJ, Caram R, Baldan R, Fuchs GE, Nunes CA. Microstructural and Mechanical Characterization of Directionally Solidified Conventional and Nb-Modified Mar-M247 Superalloy [Internet]. Journal of materials engineering and performance. 2019 ;28 2427–2438.[citado 2025 dez. 27 ] Available from: https://doi.org/10.1007/s11665-019-04014-1 -
Vancouver
Costa AMS, Lopes ESN, Contieri RJ, Caram R, Baldan R, Fuchs GE, Nunes CA. Microstructural and Mechanical Characterization of Directionally Solidified Conventional and Nb-Modified Mar-M247 Superalloy [Internet]. Journal of materials engineering and performance. 2019 ;28 2427–2438.[citado 2025 dez. 27 ] Available from: https://doi.org/10.1007/s11665-019-04014-1 - Effect of zirconium addition on the phase transformations in as-cast and heat-treated Ti–Zr–Si–B alloys
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Informações sobre o DOI: 10.1007/s11665-019-04014-1 (Fonte: oaDOI API)
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