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- W2055984821 abstract "Pack carburizing experiments have been conducted employing samples of an SAE 8620H steel. Three different carburizing mixtures have been used, each with a different content of carbonate, added to a metallurgical coke as catalyst. The change in carbon concentration along the case depth has been determined quantitatively by means of chemical analysis conducted at every 0.1 mm from the outer surface of the workpiece. It has been shown that the carbon concentration profile can be satisfactorily modeled employing the classical solution derived from Fick's second law. For this purpose, a two-step optimization procedure has been developed in order to compute, as a first step, the optimum values of the activation parameters (activation energy for diffusion and the diffusivity coefficient) of carbon in austenite, as well as the carbon potential that is established at the surface of the carburizing specimen under different processing conditions. The second step of the algorithm involves the re-computation of the carbon potential at the surface, once the activation parameters are assumed to be constant. In general, it has been observed that the addition of carbonates (BaCO3 and NaCO3) to the metallurgical coke gives rise to an increase in the carburization rate and case depth which allows the achievement of the required carbon concentration profiles more efficiently. High carburization temperatures are observed to give rise to undesired acicular structures in the workpiece at low temperatures, due to the austenite grain growth during the carburizing processing." @default.
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- W2055984821 date "1999-11-01" @default.
- W2055984821 modified "2023-09-26" @default.
- W2055984821 title "Mathematical modeling of a carburizing process of a SAE 8620H steel" @default.
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- W2055984821 doi "https://doi.org/10.1016/s0257-8972(99)00464-8" @default.
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