High Temperature Creep Rupture of T23 Steel Used for Ultra-Supercritical Power Plant

CHEN Yun-xiang,,ZHAO Li-jun,YAN Wei,WANG Wei,SHAN Yi-yin,YANG Ke

Iron and Steel ›› 2014, Vol. 49 ›› Issue (2) : 55-59.

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Iron and Steel ›› 2014, Vol. 49 ›› Issue (2) : 55-59.
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High Temperature Creep Rupture of T23 Steel Used for Ultra-Supercritical Power Plant

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Abstract

The fracture morphology of creep rupture tested samples and microstructural evolution was investigated at 600℃, and the creep rupture mechanism of a T23 steel used for ultra-supercritcal power generations was discussed under different stress levels. The results show that, under condition of high stress level, the creep rupture mechanism is similar to the ductile fracture at room temperature, and the cavities nucleate mostly at sites of the inclusions, behaving intragranular fracture. However, under low stress level, the creep rupture mechanism is brittle fracture occurred along the grain boundary, and the cavities nucleate mostly at sites of the second-phases, behaving intergranular fracture.

Key words

T23 steel / rupture analysis / microstructural evolution / creep rupture mechanism

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CHEN Yun-Xiang, DIAO Li-Jun, YAN Wei, et al. High Temperature Creep Rupture of T23 Steel Used for Ultra-Supercritical Power Plant[J]. Iron and Steel, 2014, 49(2): 55-59

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