The Effect of Dilute Titanium Additions on the Recrystallization and Grain Growth in Iron

The effect of dilute titanium additions upon the recrystallization temperature and grain growth rate of iron has been investigated. Recrystallization temperature decreased rapidly with increasing Ti contents up to 0.1 at%, and increased with further increasing Ti content thereafter, while the rate of grain growth increased rapidly for increasing Ti contents up to 0.1 at%, beyond which it decreased gradually. Accordingly the apparent activation energy for grain growth exhibited a minimum value of 74 kcal/g.atom, with addition of 0.1 at%Ti, which approximately corresponds to the reported value of self-diffusion in iron. It is therefore proposed that the growth of recrystallized grains is promoted by scavenging interstitial solutes such as O, C, N and S with Ti.