改善铁素体球铁曲轴切削加工性能的研究

为改善铁素体球铁曲轴毛坯切削加工性能，分析探讨了铁素体的固溶强化机理，对材料的化学成分、力学性能和金相组织进行了分析比较。结果表明，影响铁素体球铁曲轴硬度的主要元素是硅，在试验范围内，铁素体球铁硅含量与其硬度成正比；通过调整硅含量，严格控制球铁中其他元素的含量并保持基体中铁素体数量的一致性，可以达到控制曲轴硬度，使铸造的曲轴毛坯完全满足自动化生产线对其切削加工性能的要求。

Study on Machining Performance of the Improved Ferrite Ductile Iron Crankshaft

In order to improve the machining performance of the ferrite ductile iron crankshaft, this paper analyzed the solid solution strengthening mechanism of the ferrite,and then analyzed and compared the chemical composition, mechanical properties,and microstructure. The results show that the key element impact the hardness of the ferrite ductile iron crankshaft is silicon. In the scope of the experiment, the content of silicon in ferrite ductile iron is directly proportional to its hard ness. If other elements in ductile iron are strictly controlled and the number of the matrix ferrite is maintained,the hardness in the crankshaft can be controlled by adjusting the silicon content. By this the crankshaft can fully meet to requirements of the machining performance on automated production lines.