The previous work has indicated that the carburizing-quenching process is often accompanied by the decarburization in the surficial layer of mechanical parts. A numerical model based on “metallo-thermo-mechanics” was used to estimate the microstructure and residual stresses in the case layer of a carburizing-quenched SCr420 steel. In order to verify above model, the experimental methods, such as XRD, color metallography, microhardness indentation, and EPMA, are also used to analyze the correlative parameters. The decarburization in the carburizing-quenched SCr420 steel was observed, and the simulation results are a little different from the experimental results. According to the results, the factors of reducing the accuracy of the numerical simulation method have been discussed.
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