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本文采用单轴拉伸及定量金相分析方法研究了具有不同第二相粒子的球化低碳钢在塑性变形、断裂过程中微空洞的形成及长大过程。研究表明随着粒子尺寸的增加将有利于微空洞的形核及长大,提出了微空洞的长大是通过空洞尖端区的塑性流变而进行的。理论分析表明空洞的纵向长大速率G_L与第二相粒子间的平均自由程(λ_c)的平方根呈线性关系,并得到试验的证实。
In this paper, uniaxial tensile and quantitative metallographic analysis were used to study the formation and growth of microcavities during the plastic deformation and fracture of spheroidized mild steel with different second phase particles. The results show that with the increase of particle size, the nucleation and growth of microcavities will be benefit. It is proposed that the growth of microcavities is controlled by the plastic rheology of the cavity tip region. The theoretical analysis shows that the linear growth rate G_L of the void and the square root of the mean free path (λ_c) between the second phase particles are linear and confirmed by experiments.