Artículo
Kinetic analysis of secondary precipitation in a HP40-Nb alloy
Sosa Lissarrague, Matías Humberto
; Juan, Alfredo
; Lanz, César Armando; La Rocca, Bruno; Picasso, Alberto Carlos
![Icon](/themes/CONICETDigital/images/conicet.png)
![Icon](/themes/CONICETDigital/images/conicet.png)
Fecha de publicación:
23/12/2019
Editorial:
Technical University of Kosice
Revista:
Acta Metallurgica Slovaca
ISSN:
1335-1532
e-ISSN:
1338-1156
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The HP40-Nb heat resistant alloy (35Ni-25Cr-Nb) was analysed by means of optical microscopy after aging treatments at 1073 and 1173 K for different times, in order to apply the classic Johnson – Mehl-Avrami – Kolmogorov kinetic model (JMAK), and thus calculate the activation energy of secondary M23C6 precipitation, which occurs during thermal aging. The relevance of this theoretical analysis is to infer the mechanism that controls the nucleation and growth of M23C6 secondary carbides, since the amount and morphology of these phase influences the mechanical properties as well as the corrosion resistance in service. After performing the kinetic analysis using the JMAK model, the activation energy was found to be 208 kJ/mol, which would indicate that the secondary precipitation in this alloy is controlled by the Cr-diffusion phenomenon along the austenitic matrix.
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Articulos(IFISUR)
Articulos de INSTITUTO DE FISICA DEL SUR
Articulos de INSTITUTO DE FISICA DEL SUR
Citación
Sosa Lissarrague, Matías Humberto; Juan, Alfredo; Lanz, César Armando; La Rocca, Bruno; Picasso, Alberto Carlos; Kinetic analysis of secondary precipitation in a HP40-Nb alloy; Technical University of Kosice; Acta Metallurgica Slovaca; 25; 4; 23-12-2019; 223-229
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