Abstract
Mold-reaction products with investment in Ni-Cr alloys having Mn, Si and Al were determined for as-cast specimens. The reaction product was identified to be MgCr2O4 with α-quartz and α-cristobalite as refractory components and the formation of Mn2SiO4 was considered to due to the Mn content of the Ni-Cr alloy. In addition, the formation of the adhering area was related to the chemical composition and microstructures. The results suggest that the amount of Si and Al added to Ni-Cr alloys necessary to achieve cellular structures with corrosion-resistance is 2%.
