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Effect of tin addition on the microstructure and properties of ferritic stainless steel

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Abstract

This article reports the effects of Sn on the inclusions as well as the mechanical properties and hot workability of ferritic stainless steel. Precipitation phases and inclusions in Sn-bearing ferritic stainless steel were observed, and the relationship between the workability and the microstructure of the steel was established. Energy-dispersive X-ray spectroscopic analysis of the steel reveals that an almost pure Sn phase forms and MnS-Sn compound inclusions appear in the steel with a higher Sn content. Little Sn segregation was observed in grain boundaries and in the areas around sulfide inclusions; however, the presence of Sn does not adversely affect the workability of the steel containing 0.4wt% Sn. When the Sn content is 0.1wt%–0.4wt%, Sn improves the tensile strength and the plastic strain ratio and also improves the plasticity with increasing temperature. A mechanism of improving the workability of ferritic stainless steel induced by Sn addition was discussed: the presence of Sn lowers the defect concentration in the ultra-pure ferritic lattice and the good distribution of tin in the lattice overcomes the problem of hot brittleness that occurs in low-carbon steel as a result of Sn segregation.

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Correspondence to Ji-peng Han.

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Li, Y., Han, Jp., Jiang, Zh. et al. Effect of tin addition on the microstructure and properties of ferritic stainless steel. Int J Miner Metall Mater 22, 37–44 (2015). https://doi.org/10.1007/s12613-015-1041-y

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  • DOI: https://doi.org/10.1007/s12613-015-1041-y

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