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为了研究镁金属对于铸铁结晶之影响,曾使用了多种的试样来研究其金属组织。这些试样是:120公厘直径者,100×100×35公厘者,30公厘直径之冷激试棒经过共晶退火处理者,以及1、8、 12、20公厘直径注入金属模中之试样,在铸铁中加入0.4％的镁和矽铁作为加制剂。砂型中和冷激模中之试样铸品,均用同一25至30公斤之水包存以碳3.0％,矽1.98％、锰0.72％、磷0.058％、硫0.053％成份之铁水浇注之。上述试验中证明,未经加制的铸铁中之石墨是成一般灰铁中的片状石墨存在;而用镁加制后之铸铁中,石墨是成球状存在。如果以镁和矽铁来加制,则铸铁之结构和球状石墨之形状如所示。镁有促进
In order to study the effect of magnesium on the crystallization of cast iron, a variety of specimens have been used to study their metallic structure. These samples were: 120 mm diameter, 100 × 100 × 35 mm, 30 mm diameter cold-test rods were eutectic annealing treatment, and 1,8, 12,20 mm diameter injection mold In the sample, adding 0.4% of cast iron magnesium and ferrosilicon as a preparation. The sand castings and castings in the molds were all cast in the same 25 to 30 kg of water containing molten iron containing 3.0% carbon, 1.98% silicon, 0.72% manganese, 0.058% phosphor and 0.053% sulfur. The above test proves that the graphite in the unalloyed cast iron is flaky graphite in the general gray iron. In the cast iron after the magnesium is added, the graphite is in the form of a sphere. If made of magnesium and ferrosilicon, then the structure of cast iron and spherical graphite as shown. Magnesium has promotion