발간논문

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Vol.45, No.1, 1 ~ 6, 2007
Title
The Effect of Thermo Mechanical Treatment on Thermal Degradation Characteristic in 11Cr Ferritic Steel
권숙인 Sook In Kwun , 정우상 Woo Sang Jung , 홍석우 Suk Woo Hong , 송상민 Sang Min Song , 배득승 Deuck Seung Bae , 정순효 Soon Hyo Jung
Abstract
The effect of thermo mechanical treatment (TMT) process on thermal degradation characteristics in 11Cr ferritic steel was investigated. The alloy was manufactured by vacuum induction melting and processed through conventional heat treatment (CHT) and TMT. The major precipitates in this ferritic steel were M23C6 and MX. The amount of M23C6 precipitates was increased by the heterogeneous nucleation at dislocations in TMT sample. The strength of the TMT sample was higher than that of the CHT sample in the initial stage of aging. The Laves phase was additionally precipitated after 1,000 hours aging at 650℃. Once the Laves phase starts to precipitate during aging, the decrease of strength in TMT sample was larger than that in CHT sample. It is closely related to the shorter incubation period to nucleate the Laves phase in TMT sample.
Key Words
11Cr ferritic steels, TMT, precipitation behavior, Laves phase
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