利用小型试验轧机,对Nb-V微合金钢进行了(γ+α)双相区控轧试验。研究了终轧温度对钢的显微组织和力学性能的影响。定量估算了钢中的固溶强化σ_s,析出强化σ_p,位错强化σ_d,亚晶强化ck_s l~(-1/2)和晶粒细化的强化效应k_y d~(-1/2)。建立了一个新的有关低碳微合金化控轧钢的屈服强度关系式: σ_y=σ_i+σ_s+[σ_p~2+σ_d~2+(ck_s l~(-1/2))~2]~(1/2)+k_y d~(-1/2)用该式计算的σ_y值与实验结果符合得相当好。
The controlled roiling experiments into the dual-phase γ+a region of the Nb-V microalloy steel have been carried out using a pilot roiling mill. The effect of finishing roiling temperature on the microstructure and mechanical properties of the steel was examined. The yield strength components containing the solid solution strengthening, σ_s, precipitation strengthening, σ_p, dislocation strengthening, σ_d, subgrain strengthening, ck_s l~(-1/2) and grain strengthening, k_yd~(-1/2), were estimated so that a new expression is found as:σ_y=σ_i+σ_s+[σ_p~2+σ_d~2+(ck_s l~(-1/2))~2]~(1/2)+k_yd~(-1/2)The σ_y calculated is in quite agreement with the experimental results.
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