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An Experimental Study on Creep Behaviour of 2Cr11NiMoVNbNB Steel

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Abstract:

The creep experiments of 2Cr11NiMoVNbNB steel were carried out at 550oC and 600oC. The creep damage laws of this material are discussed. An increase of the stress exponent with decreasing temperature was found experimentally and a modified secondary creep rate equation including in creep threshold stress was derived. Creep damage analyses are made under constant stress and under relaxed stress with creep threshold stress. The experimental results show that the damage value calculated with creep time is almost equal to that calculated with the creep rate, and an iteration method of calculating is proposed.

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Periodical:

Key Engineering Materials (Volumes 306-308)

Pages:

1031-1036

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.306-308.1031

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Online since:

March 2006

Authors:

Zong De Liu, Xue Ping Mao

Keywords:

2Cr11NiMoVNbNB Steel, Creep, Damage, Relaxation

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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References

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[4] Jin Yao, Journal of Mechanical Strength. (In Chinese), 23(2001), pp.206-208. Fig. 8 The predicting total life vs. fastening interval Fig. 7 Accumulative creep damage vs. fastening numbers at different fastening durations (a) 300MPa (b) 350MPa.

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