炭素鋼の高温疲れにおけるふん囲気の影響

概要

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Fatigue tests of carbon steels were carried out at 550℃ under rotating bending and also under repeated torsion in town gas to reduce air oxidation, as a first step to study effects of atmosphere on fatigue strengths at elevated temperatures. For long lives under low stresses, the strength was higher in gas than in air, and the influence of corrosion fatigue due to oxidation was found in air at high temperature. While the strength was lower in gas than in air for short lives under high stresses, and S-N curves in air and in gas cross each other. This may be attributed to hydrogen embrittlement resulting from the decomposition of water vapor. The S-N curve at elevated temperatures may take considerably different shape by removing effects of oxidation by air, and its slope becomes more gentle after long time.
社団法人日本機械学会の論文
1959-07-25