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High Temperature Corrosion-Fatigue Test Method for Exhaust Valve Alloys
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Abstract
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.
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Caird, S. and Trela, D., "High Temperature Corrosion-Fatigue Test Method for Exhaust Valve Alloys," SAE Technical Paper 810033, 1981, https://doi.org/10.4271/810033.Also In
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