純鉛の高温における疲れ現象
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概要
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Lead is known to show a fatigue resistance in air much less than in vacuum, since it recrystallizes at room temperature. The authors have made an optical microscopic study on how the fatigue progresses in pure lead at the room temperature, 50℃ and 90℃ in air and how the structure of the metal changes. The observational results may be summarized as follows : Grain reveals slips band and a grain boundary migration occurs. The latter is not a simple parallel migration of the grain boundary before fatigue, but shows a more complicated aspect, appearing as a black belt. This may be considered to be caused from the fact that the fatigue progresses while its grain boundary changes as influenced by oxygen air. This idea has been ascertained from the manner in which a grain boundary is corroded by chemical polishing and etching after fatigue. The depth of corroded furrows has increased with the swing cycle and high testing temperature. Thus, the fatigue is continued in this way, the strength of the grain boundary has decreased and cracks have developped, finally reaching the failure. The fatigue has gradually increased, when testing temperature rises at the room temperature, 50℃ and 90℃ in air.
- 湘南工科大学の論文
- 1980-03-31
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