低炭素鋼の高温疲れ

概要

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Fatigue tests were made under the condition of constant deflection with a rotating type machine at temperatures of 450℃, 300℃ and at room temperature by applying stress cycles in the range from 170 to 3000 cpm. The results were arranged on the basis of strain amplitude and discussed by referring to the results presented by Forrest and Tapsell. The conclusions obtained may be summarized as follows : 1. At a temperature of 450℃, frequency of repeated cycles has the following influence on fatigue life, (a) under a definite stress amplitude, the number of cycles to fracture is less at lower frequency and time to fracture has a definite value irrespective of frequency. (b) under a definite inelastic strain amplitude, (in other words, when the inelastic deformation in one cycle has a definite magnitude) the number of cycles to fracture does not vary with frequency. 2. At a temperature of 300℃, higher frequency results in decreasing the number of cycles to fracture in the range of amplitude near the fatigue limit. This perhaps results from anchoring of dislocations by solute atoms of carbon or nitrogen. 3. It seems that the general characteristics of fatigue at elevated temperature do not appear until the temperature is raised over the range of blue brittleness. Maximum of fatigue strength appears at temperature 300℃.
一般社団法人日本機械学会の論文
1958-07-25