New Application of High Niobium Cast Iron as a Grain Refiner for Stainless Steels

Hayato Sakaki; Masayuki Mizumoto; Takeshi Ohgai; Akio Kagawa

doi:10.4028/www.scientific.net/KEM.457.447

Paper Titles

Surface Turbulence at Flow of Gray Cast Iron
p.422

Suppression of Elevated Temperature Brittleness in Spheroidal Graphite Cast Iron by Increasing Phosphorus Content
p.428

Selection of Cast Iron Grade for Stub-Anode Fixation in Aluminum Electrolytic Cells
p.435

Wear Property of Ductile Iron Locally Reinforced with Cr-Containing Steel Inserts
p.441

New Application of High Niobium Cast Iron as a Grain Refiner for Stainless Steels
p.447

Optimum Pressure Control of Molten Metals for Casting Production Using a Novel Greensand Mold Press Casting Method
p.453

Technology and Effectiveness of Cast Iron Treatment by Gas Injection
p.459

Fundamentally New Effective Process of Casting of Hollow Cylindrical Billets of Cast Iron by the Method of Directional Solidification
p.465

Analysing the Deformation Behaviour of Compacted Graphite Cast Irons Using Digital Image Correlation Techniques
p.470

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New Application of High Niobium Cast Iron as a Grain Refiner for Stainless Steels

Abstract:

In order to develop a new application of cast iron, high niobium cast iron has been developed as a grain refiner for stainless steel. High niobium cast iron was prepared by adding pure niobium to a commercial cast iron. Coarse primary niobium carbide crystals were observed in the microstructure of the cast iron. The effect of the high niobium cast iron as an inoculant on the grain size of austenitic and ferritic stainless steels was examined in various experimental conditions. When the amount of the cast iron inoculant more than 3 mass% was added into the steel melt, fine equiaxed grains were observed and grain size was significantly reduced to 210 μm. The results indicate that the high niobium cast iron is effective as a grain refiner for the austenitic and ferritic stainless steels. From the dissolution rate measurement, the grain refining mechanism was proposed.