Dispersion hardening effects of Nb-V precipitates in Mod.9Cr-1Mo steels

https://doi.org/10.1016/0029-5493(93)90169-AGet rights and content

Abstract

The mechanism of high creep strength of high nitrogen Mod.9Cr-1Mo steels was metallurgically investigated by using an analytical high resolution TEM. The threshold stress in the constituent equation, ϵ̀ = A(σa − σth)nexp(QRT), is strongly dependent on dispersion strengthening due to peculiar-shaped niobium-and-vanadium-precipitates, i.e. wing-like vanadium-nitrides “V-wings” adhering to spherical niobium-carbonitrides. Key factors of the strength are size and shape of the precipitates. Increase of nitrogen addition is effective to growth of V-wings leading to large threshold stress. Calculated stresses based on a dispersion strengthening showed a good fit with experimentally-measured stresses.

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