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14. Oxidation behaviour of borided Incoloy 909

Author

Gaona-Martínez, M. J., primary, Puente-Ornelas, R., additional, Gallardo-Hernández, E. A., additional, Ramírez-Ramírez, J. H., additional, Pérez-González, F. A., additional, Colás, R., additional, and Garza-Montes-de-Oca, N. F., additional

Published
2019
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15. Oxidation behaviour of borided Incoloy 909.

Author

Gaona-Martínez, M. J., Puente-Ornelas, R., Gallardo-Hernández, E. A., Ramírez-Ramírez, J. H., Pérez-González, F. A., Colás, R., and Garza-Montes-de-Oca, N. F.

Subjects
OXIDATION, OXIDATION kinetics, ACTIVATION energy
Abstract

The oxidation behaviour of Incoloy 909 superalloy subjected to diffusion boronizing treatments was studied at 750 and 850°C in atmospheres of dry air and a mixture of dry air + water vapour for times up to 10 h. The oxidation behaviour of the coated samples was described by the parabolic rate law with activation energies of 26 and 21 kJ mol−1 when oxidation was conducted in dry air or in the mixture dry air + water vapour respectively. Oxidation kinetics of the boronized coatings were sensitive to temperature and the oxidation environment promoting the development of a thick SiO2 layer on top of the coatings which also included minor additions of other oxides that acted as a barrier that reduced oxidation. However, in the conditions that included water vapour boron-rich oxides were also formed and a different oxidation behaviour was experienced. [ABSTRACT FROM AUTHOR]

Published
2020
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17. Molten aluminium attack on iron based alloys

Author

Carrera, E. A., primary, Ramírez-Ramírez, J. H., additional, Pérez-González, F. A., additional, González, J. A., additional, Crespo, I., additional, Braceras, I., additional, Martínez-de-la-Pera, I., additional, Larrañaga, A., additional, Garza-Montes-de-Oca, N. F., additional, Pérez-Unzueta, A. J., additional, Talamantes-Silva, J., additional, Cavazos, J. L., additional, and Colás, R., additional

Published
2017
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20. Surface analysis of rolled steel samples

Author

GARZA MONTES DE OCA, N, GUERRERO MATA, M. P, COLÁS, R, STAIA, M. H, LIZCANO, C, and VIRAMONTES, R

Subjects
laminación, acero, Rugosidad, surface, superficie, steel, rolling, Roughness
Abstract

El cambio en la rugosidad superficial de muestras de aceros de bajo carbono laminados en caliente y en frío se analizó por medio de dos técnicas diferentes: microscopía de fuerza atómica e interferometría óptica. Los valores de rugosidad se relacionaron con las fuerzas y velocidades de laminación en frío para evaluar su dependencia. Se encontró que ambos métodos de medición presentan la misma tendencia, aunque con diferente magnitud, lo que se atribuye tanto al área de inspección, como a la resolución y precisión de cada equipo. Se concluye que las mediciones obtenidas por ambas técnicas no son excluyentes, sino que cada método proporciona información adecuada y complementaria para este tipo de estudios. Changes in the average surface roughness of hot and cold rolled low carbon steel strips were analyzed by two different techniques: atomic force microscopy and optical interferometry. The values of roughness were related with rolling speed and force to evaluate their relationship. It was found that both methods show the same trend, but with a different magnitude, a feature that is attributed to both the area being measured and the resolution and precision of the different techniques. It is concluded that either method yields useful advantages in this type of study.

Published
2005

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