铌钛复合微合金化对含磷冷轧结构钢板组织性能的影响

以低碳含磷钢为研究对象，通过分析不同卷取温度（600、650、700℃）时热轧态和冷轧退火态的显微组织、力学性能及退火再结晶动力学行为，对比研究了微铌（0．02％）处理和铌钛复合微合金化（0．02％Nb＋0．012％Ti）对钢的组织和性能的影响。研究结果表明，与微铌处理钢相比，铌钛复合微合金化钢在600℃卷取时析出物数量更多，在更高温度卷取时熟化速度更快，650℃卷取时即熟化到一定程度。低温（600℃）卷取时，铌钛复合微合金化钢的退火再结晶更难，800℃×30s连续退火可以保证完全再结晶。将温度继续升高至800℃以上，会导致强度下降，在一定程度上影响板卷之间的性能稳定性。

Effect of Nb+Ti microalloying on microstructure and properties of phosphorus-containing steel sheet

The effects of 0.02 %Nb＋0. 012 %Ti microalloying on the microstructure and properties of phosphorus-containing steel sheet are investigated by analyzing its microstructure and properties of as hot-rolled and as annealed as well as its recrystallization dynamic behavior during annealing under different coiling temperatures （600. 650. 700 ℃ separately）. The results showed that the precipitation of Nb＋ Ti microalloyed steel （0.02 %Nb＋0. 012 %Ti ）coiled at 600 ℃ was much more than the precipitation of Nb microalloyed steel（0.02 %Nb）, and easier to coarse when it was coiled at 650℃ and 700 ℃, the precipitation of Nb＋Ti microalloyed steel was coarse enough as coiled at 650 ℃. It was also found that Nb＋Ti microalloyed steel（0.02 %Nb ＋0.012 %Ti ） is more difficult to recrystallize when coiled at 600 ℃. Full recrystallization of Nb ＋ Ti microalloyed steel （0.02 %Nb ＋ 0. 012 %Ti ） will be completed as being annealed at 800 ℃ for 30 s, its strength will decrease as the annealing temperature increases.