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Long term aging effect on the creep strength of the T92 steel

Abstract : Creep strength loss of T92 steel after long-term creep exposure at 600°C and 650°C is partially due to a thermal aging of the steel during the first part of the test. In order to quantify the effect of long-term aging on the creep strength loss, creep tests were conducted at 600 and 650°C on T92 steel thermally aged for 10,000h at the same temperature and on as-received T92 steel. Laves phases precipitates were found after thermal aging at 600°C and 650°C with an average equivalent diameter of about 200nm and of about 350nm, respectively. No significant change in hardness and in the matrix substructure as revealed by electron backscatter diffraction occurred during aging. For stresses higher than 170MPa at 600°C and higher than 110MPa at 650°C the time to rupture is four times lower in the aged steels compared to the as-received steel, this is correlated to a secondary creep rate four times higher for the aged specimens compared to that of the as-received steel. Creep tests conducted at 650°C under lower stresses revealed a creep lifetime only twice lower after aging.
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  • HAL Id : hal-00592020, version 1

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Clara Panait, Anne-Françoise Gourgues-Lorenzon, Jacques Besson, A. Fuchsmann, W. Bendick, et al.. Long term aging effect on the creep strength of the T92 steel. 9th Liege conference : materials for advanced power engineering 2010, Sep 2010, Liege, Belgium. pp.239-248. ⟨hal-00592020⟩

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