碳当量对合成铸铁力学性能的影响

Effect of Carbon Equivalent on Mechanical Properties of Synthetic Cast Iron

用合成铸铁熔炼方法,研究了不同碳当量对合成铸铁力学性能和组织的影响。结果表明,随着碳当量降低,石墨变得细小,对基体的割裂作用降低,抗拉强度提高。为了合理控制浇注温度,降低铁液收缩率,避免出现缩松缩孔、裂纹等缺陷,采用Magma模拟软件对铸造工艺进行了数值模拟优化。最终通过多次孕育改善石墨形态,不需加入合金就能获得低成本、高强度合成铸铁。

The effect of different carbon equivalents on the microstructure and mechanical properties of synthetic cast iron was studied by use of melting method of synthetic cast iron. The results show that with the decrease of carbon equivalent, the graphite flakes become finer, therefore, their splitting effect on the matrix decreases, and the tensile strength increases accordingly. Based on the numerical simulation results of the casting process that was carried out by using Magma software, reasonable pouring temperature was obtained and the shrinkage cavity and crack defects were eliminated. Finally, low cost and high strength synthetic cast iron was obtained through multiple inoculations that can improve graphite morphology and without adding alloying elements.