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研究了冷轧总压下率和退火温度对(Ti+Nb)-IF钢组织性能的影响,并采用EBSD技术对织构进行了分析。结果表明:当冷轧总压下率达到75%时,高温退火后r值可达到1.80以上,并随压下率的增大而上升;到85%时,r值达到最大值2.10左右,当冷轧总压下率达到90%时,r值开始下降。钢热轧板经80%压下率冷轧后,退火温度低于850℃时,r值随退火温度的上升而上升;850℃以上退火时,r值受退火温度影响不明显,r值保持在1.95左右。EBSD织构分析结果表明,经75%以上的大压下率冷轧后,再经850℃以上高温退火后,(Ti+Nb)-IF钢具有强烈的γ纤维织构。
The effect of total reduction and annealing temperature on the microstructure and properties of (Ti + Nb) -IF steel was studied. The texture was analyzed by EBSD technique. The results show that when the total rolling reduction reaches 75%, the value of r after high temperature annealing reaches more than 1.80 and increases with the decreasing of the rolling reduction rate. At 85%, the value of r reaches the maximum of about 2.10 When the total rolling reduction reaches 90%, the value of r starts to decrease. When the hot-rolled steel sheet is cold-rolled at the reduction of 80%, the r value increases with the increase of annealing temperature when the annealing temperature is lower than 850 ℃. The value of r is not affected by the annealing temperature when the temperature is above 850 ℃, and the value of r remains Around 1.95. The texture analysis of EBSD shows that (Ti + Nb) -IF steel has a strong γ-fiber texture after being cold rolled at a large reduction of 75% and then annealed at a temperature of 850 ℃ or above.