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Metallurgical and processing aspects of the NRC semi-solid casting technology

机译：NRC半固态铸造技术的冶金和加工方面

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摘要

With the development of squeeze casting, thixoeasting and vacuum pressure die casting it became possible in the last five years to apply light metal pressure castings for safety critical areas of modern vehicles even in large volume production. The newly developed casting processes allow the production of near net shape castings with high integrity, i.e. excellent combination of strength and ductility, which are prerequisites for light weight component design. For most suspension parts a weight saving of around 50% of the replaced steel and iron parts could be achieved. While in Squeeze Casting and Vacuum Pressure Die Casting the die cavity is filled with a fully liquid melt, in Thixocasting the melt is semi-solid and , therefore, a non-newtonian viscous slurry. At the fair GIF A 99 UBE Industries Ltd. introduced a patented new way of semi-solid casting, the New Rheocasting NRC process. This process combines the Squeeze Casting technology with a novel way of slurry making. In the present paper the metallurgical aspects of the NRC process are discussed, and compared with the classical Thixocasting process. The actual shape casting process and the properties of the resulting components shall be presented in a follow-up paper.
机译：随着挤压铸造，触变铸造和真空压铸的发展，在过去五年中，即使在大批量生产中，也可以将轻金属压铸件用于现代车辆的安全关键区域。新开发的铸造工艺可以生产具有高完整性的近净形铸件，即强度和延展性的完美结合，这是轻量化组件设计的先决条件。对于大多数悬架零件而言，可以节省大约50％的替换钢铁零件的重量。在挤压铸造和真空压铸中，模腔充满了完全液态的熔体，在触变铸造中，熔体是半固态的，因此是非牛顿粘性的浆料。在博览会上，A 99 UBE工业有限公司介绍了一种获得专利的半固态铸造新方法，即新流变铸造NRC工艺。此过程将挤压铸造技术与新颖的制浆方法结合在一起。本文讨论了NRC工艺的冶金方面，并将其与传统的触变铸造工艺进行了比较。实际的形状铸造工艺和所得零件的性能应在后续文件中介绍。

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