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Optimizing the Magnesium Die Casting Process to Achieve Reliability in Automotive Applications
Technical Paper
2005-01-0333
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
High pressure die casting is characterized by rapid die filling and subsequent rapid cooling of the molten metal in the die. These characteristics are favourable for magnesium die casting alloys. The high cooling rate favours the formation of a fine dendrite and grain structure, which in turn leads to substantial hardening; this refinement also provides improved ductility.
Since the cooling rate of the metal is highly dependent on both the process parameters and the geometry of the part, the three-dimensional flexibility associated with the latter factor means that the cooling rate cannot be uniform. This cooling rate difference in turn can lead to some variation in the mechanical properties between geometrically different portions of a die cast component. This variation is an inherent property of the material, in contrast to casting defects like microporosity, non-metallic inclusions, filling defects, and formation of hot cracks. The mechanical properties of the casting are also affected by the pre-solidification of metal in the shot sleeve.
In the present paper the correlation between the thermal conditions in the process and the resulting microstructure and mechanical properties in the casting is discussed.
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Authors
Citation
Gjestland, H., Sannes, S., Svalestuen, J., and Westengen, H., "Optimizing the Magnesium Die Casting Process to Achieve Reliability in Automotive Applications," SAE Technical Paper 2005-01-0333, 2005, https://doi.org/10.4271/2005-01-0333.Also In
References
- Gjestland H. Sannes S. Westengen H. Albright D. Effects of Casting Temperature, Section Thickness, and Die Filling Sequence Concerning Microstructure and Mechanical Properties of High Pressure Die castings NADCA conference Indianapolis September 2003
- Laukli H. I. High Pressure Die Casting of Aluminium and Magnesium Alloys - Grain Structure and Segregation Characteristics Norwegian University of Science and Technology 2004
- Laukli H. I. Lohne O. Sannes S. Gjestland H. Arnberg L. Grain Size Distribution in a Complex AM60B Magnesium Alloy Die Casting Int. J. of Cast Metals Research 2003 16 6 515 521
- Crack initiation and crack propagation in HPDC tensile bars Hydro Magnesium Competence Centre, Internal report August 2003