Porosity and non-metallic inclusions in cast iron produced with a high proportion of scrap

The work is devoted to the problem of an increase in proportion scrap metal castings smelted and produced from wear-resistant chromium cast irons. Castings obtained with more than 60% armor cracked during solidification subsequent heat treatment were selected as research objects. similar mill after operation characterized different wear resistance compare characteristics structure properties. composition, structure, amount non-metallic inclusion porosity samples cut identical places studied help methods optical scanning microscopy, metallographic analysis, X-ray fluorescence measurement Vickers hardness. characteristic localization inclusions various types iron was considered. An irons using a high found, it shown that oxide loose had most negative effect. Along primary crystals carbide (CrFe)3Ctheydo not prevent propagation cracks caused by internal stresses arising crystallization polymorphic transformations castings.