Recherches sur les soupapes d’échappement des moteurs d’aviation

Bucknall, E. H.; Ball, F.

doi:10.1051/metal/195249040249

Cited by 3 publications

(1 citation statement)

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“…Bucknall and Ball (33) described research during World War II on the improvement of materials and methods of production of exhaust valves for airplane engines. Nickel-chromium alloys (80:20) and an alloy of 74% nickel, 20% chromium, and 6% iron as well as some other alloy steels were studied.…”

Section: High Temperature Propertiesmentioning

confidence: 99%

Nickel and High-Nickel Alloys

Teeple¹

1953

Ind. Eng. Chem.

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Section: High Temperature Propertiesmentioning

confidence: 99%

Nickel and High-Nickel Alloys

Teeple¹

1953

Ind. Eng. Chem.

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Exhaust Valve Life: Some Metallurgical and Mechanical Considerations

Mogford¹,

Ball

1955

Proceedings of the Institution of Mechanical Engineers: Automob

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The factors controlling heat flow into and from the head of an exhaust valve are discussed for the purpose of indicating the means by which temperature, the overriding important factor in exhaust valve failure, can be reduced. This analysis suggests the lines along which the designer and the metallurgist must co-operate. The causes of exhaust valve failure are reviewed, and the conclusion is reached that the majority of these are the result of corrosion fatigue. Even for resistance to burning the two properties inherent in resistance to corrosion fatigue, namely resistance to corrosion and good hot strength, are essential. Laboratory tests for determining resistance to high temperature corrosion fatigue and hot hardness are described, and some results given for exhaust valve materials. Corrosion fatigue resistance is considered to be so significant a factor in exhaust valve failure that it is suggested that laboratory tests to determine this property should form the basis for the development of improved exhaust valve alloys.

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Internal Combustion Engine Poppet Valves: A Study of Mechanical and Metallurgical Requirements

Cowley¹,

Robinson²,

Flack

1964

Proceedings of the Institution of Mechanical Engineers: Automob

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Some factors affecting the performance of exhaust valves are considered and the importance of improving engine design to give minimum valve operating temperature is stressed. Strength requirements are reviewed and it is shown that the advantages of higher mechanical strength and better corrosion resistance of austenitic compared with ferritic steels may be lost due to the valves operating at higher temperatures and hoop stresses. The corrosion conditions inside the cylinder head are considered and a new test is described in which lead monoxide coated specimens are exposed to atmospheres which produce valve corrosion similar to that which occurs in an engine. The order of merit established by this test agreed fairly well with the known behaviour of valve alloys when the effect of operating temperature was taken into account. Valve head corrosion has been shown to be due to surface carburization-oxidation and internal oxidation; by applying a suitable surface coating, valve life can be appreciably increased.

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Recherches sur les soupapes d’échappement des moteurs d’aviation

Cited by 3 publications

References 0 publications

Nickel and High-Nickel Alloys

Nickel and High-Nickel Alloys

Exhaust Valve Life: Some Metallurgical and Mechanical Considerations

Internal Combustion Engine Poppet Valves: A Study of Mechanical and Metallurgical Requirements

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