ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
High pressure die-casting (HPDC) is widely used as a cost-effective way to massproducemetal components that are required to have close dimensional tolerances and smoothsurface finishes. Approximately 50%, by mass, of the aluminium castings produced worldwide aremade by this manufacturing route. However, HPDC components are relatively porous comparedwith other types of castings and so cannot usually be conventionally heat treated to improvemechanical properties. This follows because during solution treatment (e.g. at 540°C for 8h), thepores expand, resulting in unacceptable surface blisters, distortion and poor mechanical properties.Recent work within the CSIRO Light Metals Flagship has revealed a heat treatment procedure bywhich the problems of blistering and distortion can be avoided [1]. As a result, large improvementsin strength have been achieved, as compared with the as-cast condition. One uncertainty is thebehaviour of heat treated HPDCs under cyclic stress and this paper investigates the fatigueproperties of a common high pressure die-casting alloy, A380 (Al-8.5Si-3.5Cu). Comparisons aremade between as-cast, T4 and T6 conditions. Fatigue strength is highest for the alloy aged to a T6temper and ratios of fatigue strength to tensile strength for the as-cast, T4 and T6 conditions areconstant at a value of approximately 0.6, which is particularly high for aluminium alloys
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.41-42.99.pdf
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