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Cooling curves of ten different quenching oils were obtained and the hardness of test specimens quenched in these oils was determined. It was shown that the hardening power calculated from the Segerberg equation provided better agreement with test results than the transition temperature from vapor stage (full-film boiling) to the nucleate boiling stage and the maximum cooling rate. The hardening power equation also provided better agreement with respect to hardness for carbon steel than for alloy steel. The development of revised hardening power equations for carbon and alloy steels showed that there is an alloy-dependent optimal quenching temperature range, and it was concluded that the newly developed equations reported here are superior to the single equation previously published by Segerberg to quantify the quench severity provided by a quenching oil. A methodology to assess data set correlation is proposed and illustrated.
quenchants, cooling curve, hardening power, Segerberg equation
Beijing Research Institute of Mechanical and Electrical Technology, Beijing,
Xian Jiaotong University, Xian,