A novel method to study recrystallization behavior: Continuous heating stress relaxation

Abstract

The characteristics of recrystallization determine the hot working process, the final properties, and the limits of the high-temperature service of metal materials. Metal recrystallization theory is also one of the most basic scientific issues in materials science. In this paper, a novel continuous heating stress relaxation method was proposed to determine the recrystallization temperature of metal sheets, and the recrystallization behavior of H65 brass with a cold rolling reduction rate of 70% is studied by this method. The results show that the stress relaxation method can accurately obtain the recrystallization temperature characteristic points of metal samples. The effects of external load and heating rate on stress relaxation are analyzed. Compared with the hardness method, the stress relaxation method can continuously monitor the mechanical properties of materials during recrystallization. The stress relaxation method can be used to determine the recrystallization activation energy Qr of metal through the less experimental workload. The Qr of the brass samples determined by the stress relaxation method is 127 KJ/mol, which is very close to the 131 KJ/mol determined by the hardness method.