발간논문

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Vol.35, No.1, 64 ~ 72, 1997
Title
Research Paper - Mechanical Working : Formation Mechanism of Black Iron Oxide Layers in High Speed Steel Rolls
황근철Keun Chul Hwang, 이성학Sung Hak Lee, 이언식Eon Sik Lee, 안상호Sang ho Ahn
Abstract
The black iron oxide layers formed in the surface of two HSS rolls were investigated. The microstructural observation of the surface region of the HSS roll with more W and Mo additions indicated that microcracks were formed in the black iron oxide layers, and propagated along needle-shaped M₂C type carbides, thereby leading to the final separation of the black iron oxide layers from the roll surface. On the other hand, on the HSS roll with less W and Mo additions, the black iron oxide layers were hardly formed since they were fallen off easily from the roll surface. These results were explained by the molybdenum addition which affected the amount of M₂C carbides and the black iron oxide formation. In order to achieve the stable black iron oxide layer on the HSS roll surface, the molybdenum content should be controlled carefully.
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