Effect of Mg Addition on Equiaxed Grain Formation in Ferritic Stainless Steel

Ken Kimura; Shigeo Fukumoto; Gen-ichi Shigesato; Akihiko Takahashi

doi:10.2355/isijinternational.53.2167

Regular Article

Effect of Mg Addition on Equiaxed Grain Formation in Ferritic Stainless Steel

Ken Kimura , Shigeo Fukumoto, Gen-ichi Shigesato, Akihiko Takahashi

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Keywords: ferritic stainless steel, Mg addition, spinel, TiN, columnar-to-equiaxed transition, heterogeneous nucleation

JOURNAL OPEN ACCESS FULL-TEXT HTML

2013 Volume 53 Issue 12 Pages 2167-2175

DOI https://doi.org/10.2355/isijinternational.53.2167

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Abstract

The effect of Mg and Ti addition on the solidification macrostructure of ferritic stainless steel was evaluated in order to obtain fine equiaxed grains. Equiaxed solidification was promoted by adding Mg and Ti. Ti addition affects the amount of TiN as a nucleation agent of δ-Fe and the increase in constitutional undercooling. Mg addition produces spinel oxide in the molten steel, which accelerates the TiN formation. [Al] content also have an influence on the equiaxed grain formation.

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