Importance of Penultimate Grain Size and Solid Solution Impurities in Secondary Recrystallization in 50 Fe-50 Ni

Abstract

Vacuum induction melting was used to prepare eight melts of 50 Fe‐50 Ni containing principally three levels of silicon—0.028, 0.23, and 0.67 weight percent–as an impurity. After forging and intermediate annealing operations, slabs were cold reduced 95 to 98.7%. Gradient and isothermal anneals were used to study the effects of atmospheres, penultimate grain size, percent cold reduction, and impurities on the cube texture and the secondary recrystallization phenomenon. Penultimate grain size and solid solution impurities were found to be extremely important in the development of the cube texture and in the occurrence of secondary recrystallization, and they must be considered in conjunction with any possible effects of inclusions.