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本文根据几种Si—Ca的加入方式对所获蠕铁的金相和机械性能影响的实验结果,对某些文献中关于由于Ca的孕育作用或Ca主要起脱氧、脱硫作用而有利获得蠕虫状石墨的观点持有异议,作者从形成蠕虫状石墨的特定条件出发,对加入一定量的Si—Ca有利获得蠕虫状石墨提出了新的看法。文中给出了获得高的综合机械性能时,稀土和Si—Ca的较佳配比;并对(1)中,关于蠕铁的机械性能、蠕化率与1~#稀土+Si—Ca的加入量之间的关系曲线进行了修正。解释了Si—Ca加到炉内时,能获得较高的综合性能的原因。并用σ_b/HB和韧度来作为衡量材质优劣的重要依据。试验表明,稀土—Si—Ca系蠕铁具有较高的常温纯弯曲疲劳强度和耐久比。
Based on the experimental results of the influence of several Si-Ca additions on the metallurgical and mechanical properties of the obtained vermicular iron, the results obtained in some literatures concerning the inoculation of Ca, or the predominant deoxidation and desulfurization of Ca, From the point of view of the formation of vermicular graphite, the authors put forward a new view on adding a certain amount of Si-Ca and obtaining the wormlike graphite. In the paper, the best ratio of rare earth and Si-Ca is obtained when high mechanical properties are obtained. The mechanical properties and creep rate of (1) The amount of the relationship between the curve was amended. Explained why Si-Ca was added to the furnace to achieve a higher overall performance. And with σ_b / HB and toughness as an important basis for measuring the pros and cons of the material. Tests show that rare earth-Si-Ca-based vermicular iron has a higher normal pure bending fatigue strength and durability ratio.