近年来,许多国家从事研究并扩大低碳双相钢使用范围,这种钢具有高强度,较低屈服极限,高形变强化系数和大的均匀仲长的特点[1]。和普通低合金强度钢相比,这些特点改善了钢在冲压、轧制、弯曲,顶锻时形变度。在存在尖锐缺口成浸蚀性介质条件下(如渗氢),低屈服极限和小的σ_γ/σ_(?)比使应力松弛。 In recent years, many countries are engaged in the research and expansion of the use of low-carbon dual-phase steel, which has the characteristics of high strength, low yield point, high strain hardening coefficient and large uniform length [1]. These features improve the deformability of steels when they are stamped, rolled, bent, and upset compared to conventional low alloyed steels. In the presence of sharp nicks into an eroding medium (such as hydrogen permeation), the low yield stress and small σ_γ / σ_ (?) Ratio stress relaxation.