SYMPOSIA PAPER Published: 01 January 1973

High-Temperature Fatigue Testing of Automotive Valve Steels


The elevated temperature bending fatigue strength of seven automotive exhaust valve alloys has been determined. Inconel 751 shows the highest fatigue strength of 45 ksi at 108 cycles 760 C (1400 F). Coatings in air atmosphere at elevated temperature generally reduced the fatigue strength. In corrosive atmospheres consisting of a simulated lead oxide environment or a carbon monoxide/carbon dioxide atmosphere, no protection was afforded by coatings of aluminum or aluminum chromium. Within the varying surface roughness tested only the as-forged surface representing a high surface roughness and decarburization showed a drop of 24 percent in fatigue strength. Compressively stressed Stellite 6 faced valves showed ten times improvement in thermal fatigue life.

Author Information

Vitcha, ET
Materials Engineering Laboratory, TRW Valve Division, TRW Inc., Cleveland, Ohio
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Developed by Committee: E08
Pages: 231–241
DOI: 10.1520/STP38842S
ISBN-EB: 978-0-8031-5576-3
ISBN-13: 978-0-8031-5528-2