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采用75%Si－Fe加Bi复合孕育稀土镁球铁与采用75%Si－Fe孕育对比,在实验室条件下,较广泛地研究了铋对壁厚5—90毫米的铸态稀土镁球铁金相组织和机械性能的影响。试验结果及检测分析表明,微量Bi加入铁水中后,增加了球铁单位面积上的石墨球数,改善了石墨球的圆整度、尺寸和分布均匀性;同时,提高了球铁基体中的铁素体含量;还在保证球铁强度不变的条件下,明显提高了球铁塑性。
In comparison with 75% Si-Fe inoculation with 75% Si-Fe plus Bi composite inoculation, the effect of bismuth on the as-cast rare earth MgFeB with 5-90 mm wall thickness has been studied extensively under laboratory conditions. Effect of microstructure and mechanical properties. Test results and testing results show that adding trace amount of Bi into molten iron increases the number of graphite balls per unit area of ductile iron and improves the roundness, size and distribution uniformity of the graphite balls. At the same time, Ferrite content; still under the condition of ensuring the ductile iron strength, the ductile iron ductility is obviously improved.