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High‐speed temperature measurements during rapid solidification of iron‐silicon ribbons, produced by planar flow casting
Author(s) -
Frommeyer Georg,
Ludwig Andreas
Publication year - 1992
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199201730
Subject(s) - ribbon , materials science , pyrometer , supercooling , casting , melt spinning , directional solidification , heat transfer , cooling curve , planar , melt flow index , silicon , composite material , metallurgy , temperature measurement , alloy , mechanics , thermodynamics , polymer , physics , computer graphics (images) , copolymer , computer science , fiber
In order to investigate the melt undercooling and the non‐equilibrium solidification of crystalline Fe 5 wt.% Si melt spun ribbons, produced by planar flow casting (PFC), high speed temperature measurements and appropriate process simulations have been performed. Using a rotating fibre optical system with a fast response double pyrometer, the temperature radiation of the solidifying ribbon during the casting process has been recorded with a measuring frequency of 50 kHz. The obtained cooling curves have been interpreted by computer simulations. It is shown that with increasing wheel temperature the overall cooling becomes more efficient. This is caused by an improved wetting behaviour of the melt‐wheel system and an increase in the heat transfer coefficient at the interface of the solidifying ribbon and the wheel from 6 · 10 4 to about 2 · 10 5 W/(m 2 K). The solidification of 100 to 200 μm thick ribbons takes place in a time interval of 2 to 5 ms. The average growth rate varies between 10 and 60 mm/s. The high cooling rate results in a fine dendritic solidification morphology with diminishing microsegregations.