Comportamiento a altas temperaturas de aceros inoxidables austeníticos refractarios: Formación de fase σ y oxidación al aire

J. Botella; J. Almagro; E. Otero; P. Hierro; C. Merino

doi:10.3989/revmetalm.1998.v34.iExtra.710

High temperature behaviour of refractory austenitic stainless steels: σ-phase formation and oxidation in air

Authors

J. Botella ACERINOX, S.A. Centro de Investigación y Ensayos. Los Barrios Cádiz
J. Almagro ACERINOX, S.A. Centro de Investigación y Ensayos. Los Barrios Cádiz
E. Otero Dpto. de Ciencias de los Materiales e Ingeniería Metalúrgica. Fac. de Ciencias Químicas. Univ. Complutense de Madrid
P. Hierro Dpto. de Ciencias de los Materiales e Ingeniería Metalúrgica. Fac. de Ciencias Químicas. Univ. Complutense de Madrid
C. Merino Dpto. de Ciencias de los Materiales e Ingeniería Metalúrgica. Fac. de Ciencias Químicas. Univ. Complutense de Madrid

DOI:

https://doi.org/10.3989/revmetalm.1998.v34.iExtra.710

Keywords:

Refractory austenitic stainless steels, Oxidation in air, High temperatures, σ-phase

Abstract

Three stainless steels: 25Cr20Ni, 21Cr11Ni₍₁₎ and 21Cr11Ni₍₂₎ have been oxidised in air at 1,323 K for 2 h. The three materials form oxide layers 1 to 3 μm thick with MnCr₂O₄ external crystals and Cr₂O₃ inner ones. There are a SiO₂ barrier below Cr₂O₃, in the oxide-metal interface. SiO₂ also forms intra and intergranular precipitates in the metal, which are specially abundant in 21Cr11Ni materials. The theoretical predictions about σ-phase formation tendencies are confirmed after a treatment at 1,073 K for 400 h: 25Cr20Ni forms 10 % vol. σ-phase, while both 21Cr11Ni form few σ-phase or they do not form it at all.

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Published

1998-05-30

How to Cite

Botella, J., Almagro, J., Otero, E., Hierro, P., & Merino, C. (1998). High temperature behaviour of refractory austenitic stainless steels: σ-phase formation and oxidation in air. Revista De Metalurgia, 34(Extra), 67–70. https://doi.org/10.3989/revmetalm.1998.v34.iExtra.710

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Issue

Vol. 34 No. Extra (1998)

Section

Articles

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