卷取温度对微合金化含磷钢薄钢板组织和性能的影响

Effects of Coiling Temperature on Microstructures and Mechanical Properties of Micro-alloyed Rephosphorized Steel Sheet

以低碳微合金化含磷钢为研究对象,通过分析热轧态和冷轧退火态的显微组织和力学性能以及退火再结晶动力学行为,研究了卷取温度(6006、507、00℃)对微合金化含磷钢组织和性能的影响。研究结果表明,热轧卷取温度对微合金化含磷钢的显微组织和力学性能有显著的影响,随着热轧卷取温度从700℃降低到600℃,试验钢退火再结晶受到明显延迟,再结晶激活能明显提高;卷取温度对热轧态和退火态铁素体晶粒尺寸影响较小,但热轧态强度随着卷取温度降低而提高;随着卷取温度的降低,冷轧退火态的强度提高,且力学性能对退火温度的敏感性增加。

Effects of coiling temperature （600,650 and 700℃, respectively） on the microstructures and mechanical properties of micro - alloyed rephosphorized steel sheet were investigated by analyzing its microstructures and mechanical properties in as hot-rolled and as annealed conditions as well as its recrystallization dynamic behaviors during annealing. The results showed that the microstructure and properties of the experimental steel sheet were obviously affected by the hot - rolling coiling temperature and its recrystallization was prohibited significantly, resulting in higher activation energy for recrystallization, when the coiling temperature was decreased from 700 ℃ to 600 ℃. It was also found that the grain sizes at as hot - rolled or as annealed conditions were both little affected by the coiling temperature whereas not only the as hot-rolled strength and as annealed strength were increased as the coiling temperature decreased, but also the mechanical properties at as annealed conditions be- came more sensitive to annealing temperature.