발간논문

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Vol.38, No.6, 771 ~ 779, 2000
Title
Pesearch Paper / Mechanical Behaviors : Alloy Designing Study for Improving Mechanical Properties of SA 508 Steel for Nuclear Reactor Pressure Vessel
김상호Sang Ho Kim,임영록Young Roc Im,이성학Sang Hak Lee,이후철Hu Chul Lee,오용준Yong Jun Oh,홍준화Jun Hwa Hong
Abstract
This study is concerned with the development of low-alloy steels for nuclear reactor pressure vessel by investigating the effects of alloying elements on mechanical properties of base metals and heat affected zones(HAZ`s). Four kinds of steels with different alloying elements were fabricated by vacuum-induction melting and heat treatment, and their tensile properties and Charpy impact toughness were evaluated. Microstructural analyses indicated that coarse M₃C-type carbides and fine M₂C-type carbides were precipitated along lath boundaries and inside laths, respectively. In the steels having lower carbon content and higher molybdenum content, the amount of fine M₂C carbides greatly increased, while that of coarse M₃C carbides decreased, thereby leading to the improvement of tensile properties and impact toughness. Their simulated HAZ`s also had sufficient impact toughness after post-weld heat treatment. These findings suggested that low-alloy steels with high strength and toughness could be processed by reducing the amount of carbon and manganese and by raising the amount of molybdenum.
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