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

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...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2015, Vol.22 (1), p.37-44
Main Authors: Li, Yang, Han, Ji-peng, Jiang, Zhou-hua, He, Pan
Format: Article
Language:English
Subjects:
Brittleness
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composites
Corrosion and Coatings
Crystal defects
Ferritic stainless steel
Ferritic stainless steels
Glass
Grain boundaries
Hot workability
Inclusions
Lattices
Low carbon steels
Materials Science
Mechanical properties
Metallic Materials
Microstructure
Natural Materials
Phases
Plastic deformation
Segregations
Steels
Surfaces and Interfaces
Tensile strength
Thin Films
Tin
Tin compounds
Tribology
Workability
塑性应变比
夹杂物
拉伸强度
显微组织
机械性能
热加工性
铁素体不锈钢
锡
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Summary: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 con-taining 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.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-015-1041-y