Prediction of breakdown transition of creep strength in advanced high Cr ferritic steels by hardness measurement of aged structures at high temperature

被引：10

作者：

Armaki, Hassan Ghassemi ^{[1
]}

Maruyama, Kouichi ^{[2
]}

Mitsuru, Yoshizawa ^{[3
]}

Igarashi, Masaaki ^{[3
]}

机构：

[1] Tohoku Univ, Grad Sch Engn, 6-6-02 Aobayama, Sendai, Miyagi 9808579, Japan

[2] Toho Univ, Grad Sch Environom Stud, Tokyo 9808579, Japan

[3] Sumitomo Met Ind Ltd, Corp Res & Dev Lab, Tokyo 6600891, Japan

来源：

MECHANICAL BEHAVIOR OF MATERIALS X, PTS 1AND 2 | 2007年 / 345-346卷

关键词：

high Cr ferritic steel; breakdown of creep Strength; hardness drop by aging; creep rupture life; activation energy; non destructive evaluation;

D O I：

10.4028/www.scientific.net/KEM.345-346.553

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Recent researches have shown the premature breakdown of creep rupture strength in long term creep region of advanced high Cr ferritic steels, As safe operation of power plants becomes a serious problem we should be able to detect and predict the breakdown transition of creep rupture strength. Some methods for detecting the breakdown transition have been presented till now like the measurement of reduction of area after creep rupture and particle size of laves phase. However it will be more economic if we make use of non-destructive tests, for example, hardness testing. In this paper 3 types of ferritic steels with different Cr concentration have been studied. The results suggest that the hardness of aged structures is constant independently of exposure time in short term region, whereas the hardness breaks down in long term region. The boundary of breakdown in hardness coincides with that of breakdown in creep rupture strength.

引用

页码：553 / +

页数：2

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