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对一种低碳钢进行了控轧控冷试验,获得了具有铁素体和贝氏体的复相组织。利用拉伸试验机、光学显微镜、TEM等手段对复相钢的强韧性、显微组织及断口形貌进行了测试与分析。结果表明:贝氏体组织主要由宽度约为1μm的铁素体板条束组成,同时在基体上存在弥散分布的碳化物。具有铁素体贝氏体复相组织钢的屈服强度超过430MPa,且具有较低的脆性转变温度。复相钢的强化机制主要为细晶强化和贝氏体相变强化。单轴拉伸过程的能量分析表明:贝氏体的体积分数、贝氏体的分布及铁素体的晶粒尺寸是影响拉伸变形中各部分能量分配的主要因素。
A controlled rolling and controlled cooling test was carried out on a kind of low carbon steel to obtain a multiphase structure with ferrite and bainite. Tensile strength, microstructure and fracture morphology of duplex steel were tested and analyzed by means of tensile testing machine, optical microscope and TEM. The results show that the microstructure of bainite is mainly composed of ferrite laths with a width of about 1μm, while there are dispersed carbides on the substrate. The yield strength with ferritic bainite duplex steel exceeds 430 MPa and has a low brittle transition temperature. The strengthening mechanism of duplex steel is mainly fine grain strengthening and bainitic transformation strengthening. The energy analysis of uniaxial stretching process shows that the volume fraction of bainite, the distribution of bainite and the grain size of ferrite are the main factors affecting the energy distribution in each part of the tensile deformation.