Thermodynamic Parameters Analysis of MgS Superfine Inclusion in Grain Boundary

Shao Bo Zheng; Chun Feng Wu; Cun Bo Yang; Yue Gong; Hui Gai Li

doi:10.4028/www.scientific.net/AMM.217-219.174

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 217-219Thermodynamic Parameters Analysis of MgS Superfine...

Thermodynamic Parameters Analysis of MgS Superfine Inclusion in Grain Boundary

Abstract:

Activity coefficients and concentrations of dissolved magnesium and sulfur in grain boundary are two essential parts for the calculation of the Gibbs free energy of MgS superfine inclusion in grain boundary. Activity coefficients of dissolved magnesium and sulfur in grain boundary are gained first by the use of Miedema Model and Free Volume Theory. Concentrations of dissolved magnesium and sulfur in grain boundary of Fe-matrix are gained by Mclean’s equation. At last the Gibbs free energy of MgS in grain boundary is -14.048KJ/mol in E-class ship plate steel at T=1363K. By comparing the values of the Gibbs free energy of MgS in grain boundary and that in grain interior, a conclusion can be come to that MgS superfine inclusions may form in grain boundary instead of in grain interior.

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Periodical:

Applied Mechanics and Materials (Volumes 217-219)

Pages:

174-178

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.217-219.174

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Online since:

November 2012

Authors:

Shao Bo Zheng, Chun Feng Wu, Cun Bo Yang, Yue Gong, Hui Gai Li

Keywords:

Grain Boundary, MgS, Miedema Model, Superfine Inclusion

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