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The characteristics of certain experimental quenching oils
Author(s) -
Allen Frances Sarah,
Fletcher Alfred John,
Mills Alan
Publication year - 1989
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198901698
Subject(s) - quenching (fluorescence) , heat transfer coefficient , blanket , cracking , thermodynamics , materials science , boiling , distillation , chemistry , heat transfer , metallurgy , composite material , chromatography , organic chemistry , optics , physics , fluorescence
An examination has been made of the effect of certain additives on the quenching characteristics of a typical medium quenching oil. One additive, sodium sulphonate, increased the maximum surface heat transfer coefficient produced during the quench and reduced the temperature at which this occurred. The other, an ashless additive, increased the maximum surface heat transfer coefficient by a slightly smaller amount, but raised the temperature at which this occurred. The implications of these results are discussed in relation to thermal cracking, distortion and the ability of the quenchant to produce a fully martensitic structure during the quench. A photographic study of the appearance of the quenchant in the vicinity of the cooling plate is also reported, together with selected physical properties of the oil. The number and size of irregularities on the surface of the vapour blanket was increased by both additives, as was the amount of vapour produced during nucleate boiling. The most significant change in the physical properties took place in the temperature range over which distillation of the oil occurred.