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

被引:0
作者
Yang Li
Ji-peng Han
Zhou-hua Jiang
Pan He
机构
[1] Northeastern University,School of Materials and Metallurgy
来源
International Journal of Minerals, Metallurgy, and Materials | 2015年 / 22卷
关键词
ferritic stainless steel; tin; inclusion modification; microstructure; mechanical properties; hot brittleness;
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学科分类号
摘要
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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页码:37 / 44
页数:7
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