油淬可锻铸铁的强度和新的应用

Oil Quenched Malleable Iron,the Strength of an Old Material in a "Green Cast" Development and a New Future

最近的研究表明,通过采用新技术并与实践经验相结合,有可能使可锻铸铁的铸件年产量达到与球墨铸铁相同的水平。根据标准,可锻铸铁的力学性能和比屈服强度与球墨铸铁的相当,但是油淬可锻铸铁的屈服强度明显高于球墨铸铁的屈服强度。根据在相同条件下生产的超过350根试棒的性能,对球墨铸铁、空淬可锻铸铁和油淬可锻铸铁开展了范围广泛的调查和研究。对研究结果与现有的国际标准进行了比较和讨论。还讨论了其他性能,例如疲劳强度和对感应硬化那样的表面处理的响应特性。回顾和评价了可锻铸铁的成本并与其他铁基合金进行了比较。在提高铸件收得率和对强度认识方面的这些最新研究,使可锻铸铁能够与球墨铸铁相竞争,其价格比最高级别的奥铁铸铁便宜,其质量或可与钢媲美。有可能使设计轻量化而减轻零件的质量,这在汽车工业中是极其重要的。展示了"绿色铸造"研发的用于汽车传动装置和发动机的典型应用实例。

Recent developments shows,however by using new technologies and combined with practical experiance,it is possible to increase the casting yield of malleable iron to the same level as of ductile iron.The mechanical properties,specific the yield strength of malleable iron according to the standard are equivalent to those of ductile iron,however the yield strength of oil quenched malleable iron is significantly higher than that of ductile iron.An extensive investigation is made between ductile iron,air quenched-and oil quenched malleable iron based on the properties of more then 350 test bars produced under the same conditions.The results are compared with the existing international standards and discussed.Other properties like fatigue strength and response to surface treatments as induction hardening are discussed.The costs of malleable iron are reviewed and compared with other ferro-alloys.These recent developments in increasing the casting yield,the understanding of the strength,makes malleable iron competitive with ductile iron and cheaper then the first grade of ausferritic ductile iron,or steel qualities.It is possible to design lighter and save weight which is essential in the automotive industry.An example of ＂green cast＂ development for typical applications,used in automotive transmissions and engines are shown.