On the Effect of Hot Rolling on Inclusion Size and Distribution in a Cast AISI 1070 Steel Railroad Wheel

Abstract The goal of this work is to examine the effect hot deformation on shrinkage porosity and nonmetallic inclusions in an AISI 1070 grade steel industrially produced wheel casting. Steel cleanliness important consideration as it influences mechanical properties final product. A high density have been shown be detrimental for properties, especially during rolling. Using a laboratory-scale rolling mill, cast preforms were subjected 66% cumulative reduction determine thermomechanical processing void closure that may produce anisotropy properties. Quantitative automated feature analysis, AFA, inclusion type, size, morphology, distribution was conducted utilizing Aspex PICA 1020 scanning electron microscope differences as-cast as-rolled conditions. results compared with previously reported impact toughness values which indicated trend MnS projected length average T-L orientation. Reduction also verified 3D micro-X-ray CT scans. AFA showed decrease from 177 ppm condition less than 35 after Pores general much smaller widely distributed would suggest improved Analysis revealed three primary categories included MnS, Al 2 O 3 , complex mainly consisted core, small quantities mixed silicates Mn calcium aluminates (CaAl 4 ).