Effects of Addition of V and Nb on Ω in High Cr Ferritic Steels
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.
Young Won Chang, Nack J. Kim and Chong Soo Lee
M. Mitsuhara et al., "Effects of Addition of V and Nb on Ω in High Cr Ferritic Steels", Materials Science Forum, Vols. 561-565, pp. 95-98, 2007