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Analysis of MnS Inclusions Formation in Resulphurised Steel via Modeling and Experiments

Center for Advanced Solidification Technology (CAST), School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
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Materials 2019, 12(12), 2028; https://doi.org/10.3390/ma12122028
Received: 10 June 2019 / Revised: 18 June 2019 / Accepted: 21 June 2019 / Published: 24 June 2019
Controlling the formation of MnS inclusions during solidification influences the mechanical properties and machinability of the resulfurized steel. A coupled segregation–nucleation–growth model was developed by the finite-difference method involving solute redistribution, heterogeneous nucleation and growth kinetics. Laboratory solidification experiments were performed under various cooling rates in resulphurised 49MnVS steel. In this work, the influence of cooling rate on solute redistribution and growth size of MnS inclusions were simulated using the current coupled model, and the calculated results can provide a valuable reference for MnS formation. Increasing of the cooling rate led to early precipitation and refinement of formed MnS inclusions. Based on the simulation results and experimental data, mathematical relationships between the growing size of MnS with the cooling rate in the low ductility temperature region and in the whole solidification were obtained. View Full-Text
Keywords: coupled model; MnS inclusion; solidification; segregation; growth coupled model; MnS inclusion; solidification; segregation; growth
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Liu, H.; Hu, D.; Fu, J. Analysis of MnS Inclusions Formation in Resulphurised Steel via Modeling and Experiments. Materials 2019, 12, 2028.

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