Study on Recrystallization Temperature of Ti Microalloyed High Strength Steel in Cold-Rolled Strips

The recrystallization temperature of Ti microalloyed high strength steel in cold rolling were investigated by means of microhardness testing,metallographic structure observation and isothermal annealing for half an hour.The results shown that the regulations of recrystallization were basically the same in the different percentage of cold-rolling reduction steels,and the recrystallization temperature of steel had a little drop trend with the percentage of cold-rolling reduction increasing.The process was defined recovery at temperatures below 640℃,a large number of equiaxed grains nucleated,and the microhardness rapidly reduced with temperature increasing.Recrystallization grains grow up abnormally when the temperature rose to 840℃.The recrystallization temperature of steel rose to 700~710℃,large amount of nanometer TiC particles and solute atoms existed in steel were main reasons for the high recrystallization temperature.