Title

CONSTANT LOAD CREEP DATA IN AIR AND VACUUM ON 2.25Cr-1Mo STEEL FROM 600°C TO 700°C

CONSTANT LOAD CREEP DATA IN AIR AND VACUUM ON 2.25Cr-1Mo STEEL FROM 600°C TO 700°C

Authorship

BUENO, L. O.; MARINO, L.

BUENO, L. O.

I am this author

MARINO, L.

I am this author

DOI

10.5151/2594-5327-4263

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Abstract

Creep results on 2.25%Cr-1Mo were obtained at 600 °C, 650°C and 700°C at four 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 constant load data reported here were analyzed according to the conventional methodology of creep data analysis, with the identification of parameters of the Norton, Arrhenius, Monkman-Grant and Larson-Miller relations for stress, temperature, minimum creep rate and rupture time. The results indicate a strong effect of the oxidation phenomenon on the creep behaviour of this steel.

Creep results on 2.25%Cr-1Mo were obtained at 600 °C, 650°C and 700°C at four 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 constant load data reported here were analyzed according to the conventional methodology of creep data analysis, with the identification of parameters of the Norton, Arrhenius, Monkman-Grant and Larson-Miller relations for stress, temperature, minimum creep rate and rupture time. The results indicate a strong effect of the oxidation phenomenon on the creep behaviour of this steel.

Keywords

creep testing, oxidation, vacuum environment.

creep testing, oxidation, vacuum environment.