通过热模拟试验研究了冷却速率和控冷终止温度对V-N微合金化600 MPa高强钢筋组织和性能的影响.由动态CCT(Continuous Cooling Transformation)曲线和组织分析可知,实验钢筋在冷速为0.5 ～1℃/s时得到的室温组织为块状铁素体和珠光体;当冷速达到3℃/s时有少量的贝氏体(含量为5％)出现;当冷速在8℃/s以上时,实验钢筋的显微组织为少量的晶界铁素体+贝氏体+马氏体.因此,为了得到具有高强度和良好塑性的显微组织,轧后冷却速率应控制在0.5 ～3℃/s.此外,控冷终止温度应控制在600～ 625℃,显微组织为细小的块状铁素体+珠光体+少量的贝氏体(含量为0～8％),铁素体的晶粒尺寸为4.5 ～5.2 μm,试样维氏硬度为263 ～274 HV,其对应的抗拉强度为875 ～908 MPa,有足够的强度余量.
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