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在实验室制备了钒微合金化高强耐候钢,通过拉伸试验、冲击试验、扫描电镜、透射电镜对试验钢的组织结构、力学性能以及第二相粒子析出行为进行了研究,分析了不同卷取温度对耐候钢显微组织和力学性能的影响。研究结果表明:随着卷取温度的降低,试验钢在550℃获得最佳力学性能,晶粒尺寸细小,细晶强化效果明显,但是钒的析出数量减少,析出强化作用减弱。试验钢在550℃卷取时组织为铁素体、珠光体以及部分针状铁素体,针状铁素体组织以及细晶强化共同作用不但弥补了该卷取温度下析出强化的不足,而且使得试验钢的力学性能有了明显提高。
The vanadium microalloyed high strength weathering steels were prepared in the laboratory. The tensile tests, impact tests, scanning electron microscopy and transmission electron microscopy were used to study the microstructure and mechanical properties of the test steels and the precipitation behavior of second phase particles. Effect of Temperature on Microstructure and Mechanical Properties of Weathering Steel. The results show that with the decrease of coiling temperature, the best mechanical properties of the test steel are obtained at 550 ℃. The grain size is small and the fine grain strengthening effect is obvious. However, the precipitation amount of vanadium decreases and the precipitation strengthening effect decreases. When the test steel is coiled at 550 ℃, the microstructures of ferrite, pearlite and some acicular ferrite, acicular ferrite and fine grain strengthening not only make up for the lack of precipitation hardening at the coiling temperature, Making the mechanical properties of the test steel has been significantly improved.