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通过对传统IF钢成分的优化设计,研制了440 MPa级高C-高Nb型高强度IF钢。采用析出强化、细晶强化与固溶强化相结合的方法,研究了高强度IF钢退火过程中的再结晶行为,同时研究了退火温度对该钢力学性能、显微组织以及对织构发展的影响。结果表明,采用高C-高Nb成分设计的高强度IF钢在热模拟退火条件下,再结晶完成温度比传统高强IF钢高约20℃;由于沉淀强化和细晶强化,高C-高Nb的IF钢抗拉强度比同条件下传统IF钢高约40 MPa。
Through the optimization of the traditional IF steel composition, a 440 MPa high C-high Nb type high strength IF steel was developed. The combination of precipitation hardening, fine grain strengthening and solid solution strengthening was used to study the recrystallization behavior of high strength IF steel during annealing. The effects of annealing temperature on mechanical properties, microstructure and texture development influences. The results show that the high-strength IF steel designed with high C-high Nb content has a recrystallization temperature about 20 ℃ higher than that of the conventional high-strength IF steel under thermal simulated annealing conditions. Due to precipitation strengthening and fine grain strengthening, high C-high Nb The tensile strength of IF steel is about 40 MPa higher than the traditional IF steel under the same conditions.