钢中的碳含量和显微组织对屈强比的影响(英文)

Effect of carbon content and microstructure on the yield-strength ratio of steel

通过对低碳合金钢的屈强比实验,研究了碳含量和显微组织对屈强比的影响。理论分析和实验结果表明,铁素体晶粒大小会影响钢的屈强比,既铁素体晶粒越细小,则钢的屈强比越高。另外,不同的显微组织也会影响钢的屈强比。由铁素体+贝氏体组织所组成钢,其屈强比低于由铁素体+珠光体组织所组成钢,而且钢中弥散分布的M/A岛颗粒会提高钢的抗拉强度进而降低钢的屈强比。

The experiment on the yield strength ratio of low-carbon alloy steel was performed and the effect of carbon content and microstruclures on the yield strength ratio of steel was discussed. Theoretical analysis and experimental results indicate that the ferrite grain size can affect the yield-strength ratio of steel, i. e. , the smaller ferrite grain size, the higher the yield-strength ratio. In the meantime, different microstructures can also affect the yield-strength ratio of steel. The yield-strength ratio of steel composed of polygonal ferrite and bainite is lower than that of ferrite and pearlite. Furthermore, grains of M/A island in large quantities distributed in diffusion can increase the tensile strength of steel remarkably and so decrease the yield-strength ratio.