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Process conditions and oxidation behaviour of high speed steel ribbons during rapid quenching
Author(s) -
Löser Wolfgang,
Stephani Günter,
Fiedler Hans
Publication year - 1986
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198600804
Subject(s) - ribbon , quenching (fluorescence) , oxygen , materials science , wetting , alloy , metallurgy , composite material , analytical chemistry (journal) , chemistry , optics , fluorescence , chromatography , physics , organic chemistry
Oxygen absorption has been investigated in rapidly quenched ribbons of high speed steel produced by a single roller PFC‐technique. The average oxygen content of the master alloy was 130 ppm. After melt spinning, there was an increase in the oxygen level from 700 to 10 000 ppm depending on the ribbon thickness and on the ribbon‐roller contact length. Using IR‐temperature measurements, the oxygen content correlates with the ribbon temperature at the ribbon‐roller separation point. The oxygen levels rise with increasing ribbon thickness or decreasing contact length. Quenching rates are strongly affected by the wetting conditions of the solidifying ribbon at the roller surface. Secondary oxidation was interpreted using a phenomenological model for the scale constant which produced calculated data in reasonable agreement with the experimental results. Aspects for process improvement are also discussed.