EFFECT OF (ALPHA[--]ALPHA-CR-CO-MO ALLOYS(SIGMA) TRANSFORMATION ON THE STRUCTURE OF FE)

The field of the (alpha <----> alpha + sigma) transformation in the Fe -30% Cr-15% Co-3% Mo alloy and the effect of the amount of sigma phase on the structure of the alloy in alpha single-phase state are studied . Dissolution of sigma phase is accompanied by the redistribution of l attice defects which rather rapidly form substructure and large-angle boundaries of recrystallization centers in the structure of the alloy. The dependence of recrystallized-grain size in alpha solid solution o n the amount of sigma phase is similar to the dependence of the recrys tallized-grain size on the degree of cold deformation of single-phase alloys.