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利用金相显微镜、扫描电镜以及透射电镜等检测设备,研究了不同终轧温度对高强集装箱用钢的组织、性能及第二相粒子析出行为的影响。研究结果表明;不同终轧温度下高强集装箱用钢的组织均由铁素体和少量珠光体组成,铁素体晶粒度均为13.0级;850℃终轧与890℃终轧相比,屈服强度与抗拉强度分别提高32 MPa与26 MPa。理论计算与透射电镜观察结果表明:高强集装箱用钢强度的提高主要是因为850℃终轧时第二相粒子的形核率更高、析出数量更多、粒子间距更小,析出强化效果更加显著。
The effects of different finishing temperature on microstructure and properties and the precipitation behavior of second phase particles of high strength steel for container were studied by means of metallographic microscope, scanning electron microscope and transmission electron microscope. The results show that the microstructures of high strength steel for container are all composed of ferrite and a small amount of pearlite at different finishing temperature. The grain size of ferrite is 13.0 grade. Compared with 890 ℃ finishing rolling, Strength and tensile strength increased by 32 MPa and 26 MPa respectively. The results of theoretical calculation and transmission electron microscopy show that the strength of high strength steel for container is mainly due to the higher nucleation rate, more precipitation, smaller particle spacing and precipitation strengthening effect .