발간논문

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Vol.26, No.3, 242 ~ 251, 1988
Title
On the hardenability characteristics of Quenching Media for Steel in Large Section
권동철D . C . Kweon, 홍준표C . P . Hong, 김문일M . I . Kim
Abstract
In this study, the effects of auenchants and agitation conditions on the hardening and cooling power of cooling baths were investigated. Specimens of SNCM21 steel were quenched in oil bath and water bath at various agitation conditions. A multi-channel temperature measurement apparatus was employed to obtain the cooling curves at several predetermined depths from the surface of specimens. The results of microstructural observation and hardness mea surement were used for the evaluation of the cooling power of the quenching bath by means of the Grossmann method Applicability of computer simulation to the heat treatment process was tested by comparing the experimental cooling curve with the calculated one. The latter curves were obtained through the computer simulation employing the finite difference method (FDM). The mass effect of large ingot was also considered in the simulation. The degree of hard ening of steel ingot was determined by quenchants and the cooling power of the quenching bath. The necessity of efficient quenchant-quenching bath system for the proper quenching hardening could be verified by studying various combinations of the quenchant-quenching bath systems for the heat treatment of large steel ingots.
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