关键词：钢铁；回火温度；铌钛微合金；低碳贝氏体；组织性能
摘 要：The effect of tempering temperature on microstructures and mechanical properties of niobium and titanium microalloying low carbon bainite steel was investigated.The results indicate that the mechanical properties change is mainly controlled by the structure evolution,and as the structure evolution during tempering is complex,the mechanical properties do not monotonously increase or decrease with the increasing of tempering temperature.