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利用Nb—V微合金化钢进行了(γ+α)双相区控轧试验。根据实测的应变诱导γ→α相变点Ar_3(780℃),选择的终轧温度为780,730和680℃,总压下量为66％。沿轧板横向制取试样,分别进行了力学试验,金相与电镜观察和电解萃取相分析,测定了α晶粒的平均尺寸d,优错密度ρ,亚晶的平均直径l,析出颗粒的平均直径x与体积分数f_v。估算了亚晶的取向差θ和含有亚晶的α晶粒占全部α晶粒的比例系数θ,计算出位错强化σ_a,沉淀强化σ_p,晶粒细化的强化项Kyd~(1/2)和亚晶的强化项CKsl~(1/2)。所有上述的测量数据和计算结果列入表中。图1—4所示各号试样的典型的金相组织,亚晶,析出相和位错组态。
The (γ + α) dual-phase controlled rolling test was carried out using Nb-V microalloyed steel. According to the measured strain induced γ → α transformation point Ar_3 (780 ℃), the finishing temperature was selected to 780, 730 and 680 ℃, the total reduction was 66%. The samples were taken along the transverse direction of the rolling plate, and the mechanical tests, metallographic and electron microscopic observations, and the electrolytic extraction phase analysis were carried out respectively. The average size α of the α grains, the optimal density ρ, the average diameter of the subgrains 1, The average diameter x and volume fraction f_v. The misorientation angle θ of the subgrain and the proportionality coefficient θ of the α grains containing the subgrains in the total α grains were estimated, and the dislocation strengthening σ_a, the precipitation strengthening σ_p, and the grain refinement strengthening term Kyd ~ (1/2 ) And subgrain strengthening term CKsl ~ (1/2). All of the above measurements and calculations are tabulated in the table. The typical microstructure, subgrain, precipitated phase and dislocation configuration of each sample shown in Figure 1-4 are shown.