Formation and falling mechanism of black oxide layers in high speed steel rolls during hot strip milling
SCIE
SCOPUS
- Title
- Formation and falling mechanism of black oxide layers in high speed steel rolls during hot strip milling
- Authors
- Hwang, KC; Lee, S; Lee, E
- Date Issued
- 1997-06
- Publisher
- IRON STEEL INST JAPAN KEIDANREN KAIKA
- Abstract
- To shorten the roll transfer time and improve the surface quality of the hot-rolled products, the black oxide layers formed on the roll surface were analyzed by means of SEM, WDS and X-ray diffraction techniques, for two rolls with different W and Mo contents. The observation of the near-surface region of the HSS roll with more W and Mo additions indicated that microcracks formed in the black oxide layers on the roll surface, and easily propagated along needle-shaped M2C type primary carbides segregated in the intercellular regions. This led to further crack growth along M2C carbides, and then to the final falling of the black oxide layers from the roll surface. On the other hand, in the HSS roll with less W and Mo additions, the black oxide layers ware hardly evident, since they were fallen off easily from the roll surface. These results were interpreted by the molybdenum addition which affected the amount of M2C carbides and the black oxide formation, suggesting the existence of a proper molybdenum content to achieve the stable black oxide layers on the HSS roll surface.
- Keywords
- black oxide layers; roll; crack; hot mill
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/21308
- DOI
- 10.2355/tetsutohagane1955.83.6_383
- ISSN
- 0021-1575
- Article Type
- Article
- Citation
- TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN, vol. 83, no. 6, page. 383 - 388, 1997-06
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- There are no files associated with this item.
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