Recrystallization behavior of Ti microalloyed non-oriented silicon steel
Recrystallization temperature,hardness,microstructure and precipitation distribution of Ti microalloyed non-oriented silicon steel and ordinary non-oriented silicon steel were studied by means of isothermal annealing for half hour,optical microscope,microhardness tester and transmission electron microscopy.The results show that the recrystallization temperature of the Ti microalloyed non-oriented silicon steel is 55℃higher than that of the ordinary non-oriented silicon steel.The microstructure changes of the two steels are the same.As the annealing temperature increases,recrystallized grains begin to appear,the hardness decreases,and the deformed structure is gradually replaced.The Ti microalloyed non-oriented silicon steel contains nanoscale titanium containing precipitates distributed near dislocations,which can pin dislocations during annealing,hindering grain boundary movement and delaying the recrystallization.
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