This content is not included in your SAE MOBILUS subscription, or you are not logged in.
DuraBowl\ST: Locally Modified Piston Material for Highest Stresses and Temperatures
Published May 20, 2009 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Conference
Customer requirements for increased engine output, reduced emissions and fuel consumption result in increased mechanical and thermal loading on the piston. The interaction of piston material microstructure against compelx thermo-mechanical loading from engine operation was studied. Crack initiation and growth observations were conducted under superimposed thermal cycling and High Cycle Fatigue (HCF) loading. Crack initiation at primary silicon particles resulting from thermal cycling significantly reduces HCF life. This can be reduced or inhibited by reducing the size of primary silicon particles. Locally re-melting the bowl rim achieves c.10x finer microstructure, resulting in 4 to 8x increased life.