A rotating beam fatigue test method was developed to determine the high-temperature corrosion-fatigue properties of valve alloys under cyclic stress in a simulated engine operating environment. The test results showed that microstructural modification of an alloy through heat treatment can significantly improve corrosion-fatigue properties. For test development purposes, Nimonic 80A was selected for testing and a mixture of lead compounds was used as the corrosive environment. This is a typical combination of alloy and environment found in heavy-duty spark-ignited engines. This test method may also be applicable to other corrosion-fatigue problems such as sulfidation in diesel exhaust valves.
High Temperature Corrosion-Fatigue Test Method for Exhaust Valve Alloys
Sae Technical Papers
SAE International Congress and Exposition ; 1981
01.02.1981
Aufsatz (Konferenz)
Englisch
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