Abstract
A new approach for limit deformation in the final freezing zone and for thermal contraction with increase of fraction solid was applied to investigate the quantitative and detailed mechanism of hot tearing through solidification of Cu-Zn alloy castings. The limit deformation is determined by apparent deformation of solidifying alloy and length of final freezing zone. The calculated thermal contraction is expressed as functions of such alloy properties as fraction solid at linear contraction start and coefficient of linear shrinkage and such casting conditions as temperature gradient, length of final freezing zone and length of casting. Occurrence of hot tearing in I-beam test bar is predicted by comparing the limit deformation with thermal contraction through solidification.
