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Vol.19, No.12, 1098 ~ 1105, 1981
Title
Effect of Nb on Mechanical and Precipitation Behavior in 20% Ni Maraging Steel
백경욱Kyung Wook Paik, 김영길Young Gil Kim
Abstract
20% Ni managing steels with and without Nb (0.5 w/o) were prepared in vacuum induction melting furnace, followed by hot working and heat treatments. The yield strength of the Nb-containing alloy was about 4% higher than that of Nb-free alloy under managed conditions. However, the charpy impact energy of Nb-containing alloy tested at room temperature was lower by 25%, compared with that of Nb-free alloy, under the managed condition. Precipitates phases formed in the Nb-free alloy were HCP Ni₃Ti(η) and FCC Ni₃(Ti, Al)(γ`), while in the Nb-containing alloy orthorhombic Ni₃Nb appeared in addition to the ηand γ`phases.
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