PM and Rheocasting in Ductile Iron Castings

IF 2.6 3区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
Haruki Itofuji, Kazuya Edane, T. Sakatani, Natsuki Utagawa, Masayuki Itamura
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Abstract

Permanent mold (PM) and semi-solid (rheo) casting in ductile iron castings (DIC) were studied, and the microstructure was aimed to be chill free in as-cast condition. Denitrification was conducted understanding solubility properties of nitrogen in base molten iron, and re-nitrification was strictly avoided during molten treatment by Mg alloy. As the results, chill-free knuckle castings were possible with both casting methods in as-cast condition. The knuckle castings had no shrinkage cavity also. The solidification time by rheocasting was shorter than that of PM casting. It was approximately one in two and a half. The castings had ultrafine spheroidal graphite which were mostly under 10 µm. The graphite structure by rheocasing method was finer and more uniform than those of PM casting. The tensile strength in castings with both casting methods was approximately 1.3 times keeping elongation over 10% comparing with conventional sand knuckle castings. It was concluded that free nitrogen (NF) promoted chill formation, and chill could be avoided by promoting denitrification and minimum re-nitrification.

Abstract Image

球墨铸铁铸件中的 PM 和流变铸造
研究了球墨铸铁铸件(DIC)中的永久铸型(PM)和半固态(rheo)铸造,其微观结构的目标是在铸件状态下无寒意。根据氮在基体铁水中的溶解特性进行了脱氮处理,并在用镁合金进行熔融处理时严格避免了再脱氮。结果表明,两种铸造方法都能在现浇状态下铸造出无冷节铸件。节铸件也没有缩孔。流变铸造的凝固时间比永磁铸造短。约为二分之一半。铸件中的超细球状石墨大多小于 10 微米。流变铸造法得到的石墨结构比永磁铸造法得到的石墨结构更细、更均匀。与传统砂节铸件相比,这两种铸造方法的铸件抗拉强度约为后者的 1.3 倍,伸长率超过 10%。研究得出结论,游离氮(NF)会促进寒化的形成,而寒化可以通过促进反硝化和减少再硝化来避免。
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来源期刊
International Journal of Metalcasting
International Journal of Metalcasting 工程技术-冶金工程
CiteScore
4.20
自引率
42.30%
发文量
174
审稿时长
>12 weeks
期刊介绍: The International Journal of Metalcasting is dedicated to leading the transfer of research and technology for the global metalcasting industry. The quarterly publication keeps the latest developments in metalcasting research and technology in front of the scientific leaders in our global industry throughout the year. All papers published in the the journal are approved after a rigorous peer review process. The editorial peer review board represents three international metalcasting groups: academia (metalcasting professors), science and research (personnel from national labs, research and scientific institutions), and industry (leading technical personnel from metalcasting facilities).
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