발간논문

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Vol.38, No.3, 460 ~ 466, 2000
Title
Pesearch Paper / Mechanical Behavior : High Temperature Oxidation and Hot Wokability of Fe-36%Ni Alloy
이수찬Soo Chan Lee,이윤용Yun Yong Lee,이용득Yong Deuk Lee
Abstract
Fe-36%Ni alloy has been widely used for bimetal and shadow masks in cathode ray tubes and structural materials of LNG storage tanks because of its low thermal expansion coefficient. The purpose of this study is to evaluate the effects of reheating environments(excess oxygen and SO₂ content) and strain rate on the oxidation properties and hot workability of Fe-36%Ni alloy. The internal oxidation increased with increasing excess oxygen and SO₂ contents in environments arid with increasing reheating temperatures. Under the conditions containing low excess oxygen and no SO₂ in environments, the weight gain behavior is minimized because of the formation of FeO instead of Fe₃O₄ or Fe₂O₃ in the external scale. It is also found that the hot workability of Fe-36%Ni alloy decreased with decreasing strain rate due to the dominating intergranular fracture and the one is improved under the non-oxidation reheating environments by preventing the notch effect arisen from internal oxidation.
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