 Review: New piston by Federal-Mogul CorporationPublished on Sat, Nov 21, 2009 at 14:10 | Source : Overdrive Magazine Updated at Sat, Nov 21, 2009 at 15:39 The re-melted alloy cools a thousand times faster than it did when originally cast, which leads to much smaller silicon particles; only one tenth of the previous size. Metallurgists refer to this as refinement of the microstructure; a technique known to increase the strength and durability of metal alloys.
The technological and cost benefits have been validated during extensive engine testing, both by Federal-Mogul and its customers. Doernenburg concluded, "The re-melting process certainly increases piston life and performance substantially, while at the same time, serving as a contributor to improve fuel efficiency and reduce CO2. A conservative estimate would be a fourfold improvement in the life of any cast piston which suffers from bowl rim failures." The first application of the DuraBowl process is on a high-performance diesel engine recently launched for a leading global vehicle manufacturer.
The metallurgy of DuraBowl® Federal-Mogul's unique re-melting process for the aluminum-silicon alloy, combined with a rapid cooling process, significantly changes the alloy's microstructure by reducing the size of hardening phases such as silicon particles and intermetallics. The result is a piston bowl rim whose first few millimeters provide significantly improved aluminum strength, further enabling engine manufacturer's efforts to downsize or turbo-boost engines for greater specific output."
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