ISSN 2594-5327
59º Congresso anual — Vol. 59 , num. 1 (2004)
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The metal loss kinetics during isothermal unstressed oxidation of 2,25Cr-1Mo steel was studied at high temperatures, for different time periods up to one thousand hours, using cylindrical specimens with dimensions similar to standard creep testpieces. The metal thickness (y) exhibited a decreasing rate of loss with the exposition time (t) at the various temperatures, according to the parabolic behaviour relation y²=Kml·t. The Kml coefficient exhibited an Arrhenius temperature dependence with activation energy close to the activation energy for iron diffusion in the rich in chromium internal oxide layer formed in the specimens. Based on the metal loss kinetics equation, the variation of the specimen cross sectional area with time was assessed and corresponding stress enhancement factors were obtained which can be useful for assessing the effect of oxidation during creep testing.
The metal loss kinetics during isothermal unstressed oxidation of 2,25Cr-1Mo steel was studied at high temperatures, for different time periods up to one thousand hours, using cylindrical specimens with dimensions similar to standard creep testpieces. The metal thickness (y) exhibited a decreasing rate of loss with the exposition time (t) at the various temperatures, according to the parabolic behaviour relation y²=Kml·t. The Kml coefficient exhibited an Arrhenius temperature dependence with activation energy close to the activation energy for iron diffusion in the rich in chromium internal oxide layer formed in the specimens. Based on the metal loss kinetics equation, the variation of the specimen cross sectional area with time was assessed and corresponding stress enhancement factors were obtained which can be useful for assessing the effect of oxidation during creep testing.
Palavras-chave
oxidation, metal loss, ferritic steels
oxidation, metal loss, ferritic steels
Como citar
Bueno, L. O.; Marino, L..
METAL LOSS KINETICS DURING UNSTRESSED ISOTHERMAL OXIDATION IN 2,25Cr-1Mo STEEL FROM 600ºC TO 800ºC,
p. 3821-3828.
In: 59º Congresso anual,
São Paulo, Brasil,
2004.
ISSN: 2594-5327, DOI 10.5151/2594-5327-4259
