对比研究了经控锻-控冷处理的V-Ti和Nb-V-Ti微合金非调质钢的显微组织和力学性能.结果表明,Nb-V-Ti复合微合金化和控锻-控冷处理能有效细化组织,改善珠光体形态,促进v(C,N)相析出,提高非调质钢的冲击韧性.添加Nb显著提高抗奥氏体晶粒粗化温度,使细小碳氮化物弥散分布.与传统控锻-控冷工艺相比,850～ 900℃再结晶-未再结晶控锻-控冷工艺,使珠光体片碎化及部分球化,是导致V-Nb-Ti非调质钢冲击韧性提高的主要原因.
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