Evaluation of long-term creep rupture life of Gr.91 steel by analysis of on-going creep curves

Maruyama, Koichi*; Nakamura, Junya*; Yoshimi, Kyosuke*; Nagae, Yuji

A methodology is developed for evaluating its creep rupture life from analysis of an on-going creep curve with the aid of an creep curve equation. The method is applied to on-going creep curves of grade 91 steel for evaluating their rupture lives. Quick decrease in creep rupture strength has been reported recently in long-term creep of grade 91 steel. The quick decrease of the steel is discussed by using the rupture lives evaluated. The quick decrease is confirmed in the present study in the time range longer than 310 $^{4}$ h at 600 $^{circ}$ C.

Language	:	English
Journal	:	Advances in Materials Technology for Fossil Power Plants; Proceedings from the 8th International Conference (EPRI 2016)
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Pages	:	p.467 - 478
Publication Year/Month	:	2016/00
Meeting title	:	8th International Conference on Advances in Materials Technology for Fossil Power Plants
Held date	:	2016/10
Location (city)	:	Albufeira
Location (country)	:	Portugal
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Keywords	:	no keyword
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Registration No. : BB20160973
JAEA Abstracts No. : 46000712
Paper Submission No. : 20293

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