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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, KCLee, SLee, 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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이성학LEE, SUNG HAK
Dept of Materials Science & Enginrg
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