Precipitations of second phases in steel grades influence the mechanical properties of the material significantly. Manganese sulphides especially affect the ductility properties at high as well as at low testing temperatures. For a sufficient appreciation of the influence of MnS precipitates on the properties, a proper knowledge about the parameters in regard to the size and distribution of MnS precipitates is necessary. This paper proposes a model to describe the solidification of a medium carbon steel grade, the micro-segregation of manganese und sulphur and the subsequent precipitation of MnS. Especially for the calculation of the mean radius of globular MnS precipitates after solidification, a new approach is presented regarding the MnS size as a function of the manganese and sulphur content, the cooling rate during solidification and the secondary dendrite arm spacing. The model is validated by means of quench tests in combination with light-optical and scanning electron microscopic evaluations of the size distribution of MnS precipitates as well as EDX analysis for the composition of the formed sulphide phase.
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Diederichs et al. (2006) studied this question.
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