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首页> 外文期刊>Journal of Materials Engineering and Performance >Solidification Characteristics of Silicon-Alloyed Ductile Cast Irons
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Solidification Characteristics of Silicon-Alloyed Ductile Cast Irons

机译：硅合金延性铸铁的凝固特性

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摘要

Solidification pattern of three ductile iron compositions [I-2.5%Si; II-4%Si, and III-4%Si-1.6%Mo] is studied, to evaluate the effects of high Si and Mo contents. Inoculation compensates for the negative effect of Mo on eutectic undercooling. The deviation using a sphere as reference of graphite particles is noticeably increased by silicon alloying, when a characteristic of the graphite particles appears have a larger perimeter, resulting in a large category [IV, V and VI forms, ISO 945]. The sphericity shape factor (SSF) considering the real perimeter of particle is recommended in the nodularity evaluation in high-Si ductile iron, instead of the roundness shape factor, involving maximum ferret, presently incorporated in the ISO 945 standard. The higher the minimum acceptable SSF is, the greater difference in nodularity, between conventional and Si-alloyed ductile irons. For more than 4%Si, ductile irons are characterized by a medium-quality graphite phase, with prevalent form V-ISO 945 graphite. A specific inoculant, with a powerful action on the graphite particle compactness, especially to promote VI graphite form, is necessary.
机译：三个韧性铁组合物的凝固图案[I-2.5％Si;研究II-4％Si和III-4％Si-1.6％Mo]，以评估高Si和Mo含量的影响。接种补偿Mo对共晶过冷的负面影响。当石墨颗粒的特征出现较大的周边时，通过硅合金化显着增加使用球体作为石墨颗粒的参考，导致大类[IV，V和VI形式，ISO 945]。考虑到真正的粒子的球形形状因子（SSF）建议在高Si延展铁中的结节性评估中，而不是涉及最大雪貂的圆度形状，目前掺入ISO 945标准中。最小可接受的SSF越高，常规和Si合金延性铁杆之间的结节性差异越大。对于4％以上的Si，延展性熨斗的特征在于中质石墨相，具有普遍的形式V-ISO 945石墨。具有对石墨粒子紧凑性的强大作用的特异性接种剂是必要的，特别是促进VI石墨形式。

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