炭素鋼の低速捩り疲労変形に及ぼす温度の影響

概要

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Machine parts often are subjected to repeated stresses at elevated temperatures and the fatigue deformation of the machine parts caused by repeated stresses may have undesirable effect upon the faculty and the accuracy of these machine parts. In this paper, the effect of elevated temperatures (100℃, 250℃, 350℃) upon the fatigue deformations of cold worked and torsional stress-aged 0.37% steels caused by slow cyclic torsional stress was investigated. The results obtained are as follows : (1) In cold worked specimen, the more temperature was elevated, the more fatigue yield strength increased, at the range of temperature from room temperature to 250℃, but at 350℃ it decreased. (2) In torsional stress-aged specimen, the more temperature was elevated, the more fatigue yield strength decreased, at the range of temperature up to 250℃ in τ_a/τ_m≦1, but increased in τ_a/τ_m>т1. And at 350℃ it decreased in the all values of τ_a/τ_m. (3) It seems that the above behavior of the fatigue yield strength is related to a structural change of the fatigue strength in τ_a/τ_m> is related to the diminution of the Bauschinger effect caused by these factors. (4) Torsional stress-aged steel is more useful in preventing the fatigue deformation than cold-worked one at the range of elevated temperature up to 350℃.
社団法人日本材料学会の論文
1959-03-15