日本金属学会誌

J. Japan Inst. Metals, Vol. 52, No. 5 (1988),
pp. 495-501

Controlled Gas Carburizing Process for SCr420 Steel

Akira Muroga1, Itaru Niimi2, Yoshiki Tsunekawa2 and Masahiro Okumiya2

1Aichi Steel Works Ltd., Tokai
2Faculty of Engineering, Toyota Technological Institute, Nagoya

Abstract:

A new gas carburizing process which is capable of easily determining a suitable parameter has been developed using an explicit finite-difference method and a direct-search method of optimization. In this process, a weighting factor was introduced into this process for optimizing the carbon profile and time. Increasing the weighting factor made the difference between the calculated and target carbon profiles smaller but the treating time longer. Calculated carbon profiles of SCr420 steel were compared with experimental results by a atmosphere-control system using a zirconia oxygen-sensor. Agreement between the calculated and measured profiles was very good.
The dependence of the diffusion coefficient on carbon concentration in SCr420 steel is expressed experimentally as follows:


(Received 1987/11/24)

Keywords:

chromium steel, carburizing, diffusion coefficient, explicit finite-difference method, direct-search method of optimization, simulation, carbon concentration profile, zirconia oxygen-sensor


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