High-Performance Cast Aluminum Pistons for Highly Efficient Diesel Engines
Date Published: 2007-04-16
Paper Number:2007-01-1438
DOI: 10.4271/2007-01-1438
Citation:
Reichstein, S., Weiss, R., Kenningley, S., Lades, K. et al., "High-Performance Cast Aluminum Pistons for Highly Efficient Diesel Engines," SAE Technical Paper 2007-01-1438, 2007, doi:10.4271/2007-01-1438.
This paper introduces a new hypereutectic aluminum alloy for piston casting, an improved casting process and a new re-melting procedure. The resulting microstructures improve the fatigue performance of the piston combustion bowl region exposed to severe cyclic thermal and mechanical loading in modern diesel engine applications. It is shown how composition and material properties of the new alloy increase the material's fundamental properties, compared to an existing hypereutectic alloy. The new casting process minimizes the occurrence of fine oxide inclusions which helps to exploit the fundamental material strength. Finally the paper describes the combustion bowl re-melting process and gives engine validation results to illustrate its considerable influence on premature fatigue failure.
See papers presented at SAE World Congress & Exhibition, April 2007, Detroit, MI, USA, Session: CI and SI Power Cylinder Systems (Part 3 of 4) Power Cylinder Durability and Reliability
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