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| High Temperature Creep Rupture of T23 Steel Used for Ultra-Supercritical Power Plant |
| CHEN Yun-xiang1,2,ZHAO Li-jun2,YAN Wei2,WANG Wei2,SHAN Yi-yin2,YANG Ke2 |
1. Electric Power Research Institute of State Grid Fujian Electric Power Company Limited, Fuzhou 350007, Fujian， China
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning， China |
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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.
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Received: 07 December 2012
Published: 20 February 2014
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2014, Vol. 49 
