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Materials Research

versão impressa ISSN 1516-1439versão On-line ISSN 1980-5373


BUENO, Levi de Oliveira; SORDI, Vitor Luiz  e  MARINO, Luiz. Constant load creep data in air and vacuum on 2.25Cr-1Mo steel from 600 °C to 700 °C. Mat. Res. [online]. 2005, vol.8, n.4, pp.401-408. ISSN 1516-1439.

Creep results on 2.25Cr-1Mo were obtained at 600 °C, 650 °C and 700 °C at five stress levels, under constant load, in air and vacuum. Two chambers were specially developed for carrying out creep testing in controlled environment, with the possibility of accommodating inside them the load train, the extensometry system and the thermocouples. The creep machines used in this project present the advantage of allowing the performance of both constant load or constant stress creep testing, using interchangeable profiles. The preliminary set of constant load data reported here was analyzed according to the conventional methodology of creep data analysis, with the identification of parameters of the Norton, Arrhenius, Monkman-Grant and some extrapolation relations involving stress, temperature, minimum creep rate and rupture time. The results indicate a strong effect of the oxidation phenomenon on the creep behavior of this steel. The data were consistent and meaningful so that the developed chambers can be considered to present good performance in the generation of creep data in vacuum.

Palavras-chave : creep testing; oxidation; vacuum environment.

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