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Effects of Addition of V and Nb on Ω in High Cr Ferritic Steels

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Abstract:

Creep tests and microstructural observations in several high Cr ferritic steels bearing V and Nb were carried out in order to investigate effects of addition of V and Nb on , which is a coefficient of  method. Creep strength was improved with increasing the V content and was slightly lowered by increasing the Nb content.  in all the steels bearing V or Nb was lager than that in fundamental steel. The dependence of  on the amount of additions was different between V and Nb. In steels bearing V,  became larger with increasing V content. In steels bearing Nb,  became smaller. These results revealed that  corresponds to the creep strength, indicating that the value of  can be estimated using the strengthening effects of the additive element.

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Periodical:

Materials Science Forum (Volumes 561-565)

Pages:

95-98

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.561-565.95

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Online since:

October 2007

Authors:

Masatoshi Mitsuhara, Yu Yoshida, Kenichi Ikeda, Hideharu Nakashima, Takashi Wakai

Keywords:

Creep Curve, Creep Life Assessment, High Cr Ferritic Steel, Ω Method

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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