Processing maps for Fe-24Ni-11Cr-3Ti-1Mo superalloy

Abstract

Hot deformation characteristics of a Fe-base superalloy were studied at various temperatures from 1000-1200°C under strain rates from 0.001-1 s -1 using hot compression tests. Processing maps for hot working are developed on the basis of the variations of efficiency of power dissipation with temperature and strain rate and interpreted by a dynamic materials model. Hot deformation equation was given to characterize the dependence of peak stress on deformation temperature and strain rate. Hot deformation apparent activation energy of the Fe-24Ni-11Cr-1Mo-3Ti superalloy was determined to be about 499 kJ/mol. The processing maps obtained in a strain range of 0.1-0.7 were essentially similar, indicating that strain has no significant influence on it. The processing maps exhibited a clear domain with a maximum of about 40-48% at about 1150°C and 0.001 s-1. © Indian Academy of Sciences.