Deformation Behavior of Borated 18Cr-8Ni Stainless Steel Accompanied by Eutectic Structure during Solidification

Abstract

Tensile strength and ductility behavior of borated 18Cr-8Ni stainless steel samples during solidification has been studied by the technique for high temperature tensile test. Density of samples has been measured by a sessile drop method during solidification.
Borated 18Cr-8Ni stainless steel has formed eutectic morphologies in addition to dendritic structure during solidification. The ratio of eutectic structure increased with increasing boron concentration. Eutectic composition was 2.2 mass% boron from the result of differential thermal analysis. The behavior of tensile strength and ductility has depended on the morphologies of solidification microstructure. When the ratio of eutectic structure was more than 70%, tensile strength and ductility has not appeared until fraction of solid became unity. Density of samples was unaffected by eutectic structure.