针对富氮钒铌微合金化控冷工艺生产的500 MPa高强钢筋,利用热模拟试验,通过SEM、硬度试验、TEM及XRD研究了精轧后采用不同控冷温度对钢筋显微组织、晶粒度、硬度及析出相的影响.结果表明,控冷终止温度控制在720～740℃,显微组织为细小块状铁素体+珠光体+少量贝氏体(含量6％ ～15％),组织配比及形态较好,有利于钢筋强度提高和塑韧性的改善;铁素体晶粒度为10.5 ～ 11.0级,细晶强化及抗震性能较好;试样维氏硬度为208 ～ 213 HV,其对应的抗拉强度Rm为700 ～720 MPa,强度富余量适中;铁素体基体、晶界及位错线上形成和分布着尺寸为5～ 30 nm的大量细小弥散的V(CN)、Nb(CN)析出相,析出相的体积分数70％,起到了较好的沉淀强化及细化晶粒作用.
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