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本文就几种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的主要脱氧、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性机械性能时,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6b/HB和韧度来作为衡量材质优劣的重要判据。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。最后对试验中出现的所谓“小蠕虫状”石墨的成因及其对机械性能的影响,进行了概略的分析。
In this paper, several ways to add Si-Ca, the experimental results on the metallurgical and mechanical properties of the obtained vermicular iron; some of the literature on the inoculation due to Ca or Ca major deoxygenation, desulfurization and beneficial effects of the worm Graphite-like point of view hold objections. Based on the specific conditions for the formation of vermicular graphite, the authors put forward a new view on obtaining a certain amount of Si-Ca to obtain vermicular graphite. In the paper, the best ratio of rare earth to Si-Ca is obtained when obtaining high comprehensive mechanical properties. The mechanical properties and creep rate of 1 ~ * rare earth + Si-Ca 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 6b / HB and toughness as an important criterion to measure 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. Finally, the causes of the so-called “small worm-like” graphite appearing in the test and its influence on the mechanical properties were analyzed.