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The diesel engine subjects the piston to low cycle thermal loading due to variable engine operating conditions super-imposed with high cycle mechanical and thermal loading a consequence of the combustion loading per engine cycle.
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At peak temperatures in excess of 400 ¡ãC coarse and unevenly distributed microstructures are particularly susceptible to thermo-mechanical fatigue failures. New piston alloys and processes are being designed to achieve high stability at temperatures of up to 440 ¡ãC while improving resistance to thermo-mechanical fatigue (TMF) loading.

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