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http://dx.doi.org/10.5228/KSPP.2010.19.1.025

A Study on Temperature Measurement for Quenching of Carbon Steel  

Kim, D.K. (한국과학기술원 기계공학과 대학원)
Jung, K.H. (한국과학기술원 기계공학과 대학원)
Kang, S.H. (한국기계연구원 부설 재료연구소)
Im, Y.T. (한국과학기술원 기계공학과)
Publication Information
Transactions of Materials Processing / v.19, no.1, 2010 , pp. 25-31 More about this Journal
Abstract
To achieve desired microstructure and mechanical property of a manufacturing product, heat treatment process is applied as a secondary process after forging. Especially, quenching process is used for improving strength, hardness, and wear resistance since phase transformation occurs owing to rapid heat transfer from the surface of the specimen. In the present paper, a study on surface temperature measurement for water quenching of eutectoid steel was investigated. In order to determine the temperature history in experiments, three different measuring schemes were used by varying installation techniques of K-type thermocouples. Depending on the measured temperature distribution at the surface of the specimen, convective heat transfer coefficients were numerically determined as a function of temperature by the inverse finite element analysis considering the latent heat generation due to phase transformation. Based on the inversely determined convective heat transfer coefficient, temperature, phase, and hardness distributions in the specimen after water quenching were numerically predicted. By comparing the experimental and computational hardness distribution at three different locations in the specimen, the best temperature measuring scheme was determined. This work clearly demonstrates the effect of temperature measurement on the final mechanical property in terms of hardness distribution.
Keywords
Quenching; Phase Transformation; Inverse Analysis; Convective Heat Transfer Coefficient;
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