SUS316鋼の熱疲労強度に及ぼす繰返し速度および温度ひずみ波形の影響

概要

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The effects of frequency and temperature- and strain-waveform on thermal fatigue strength were examined by conducting out-of-phase and in-phase thermal fatigue tests with three kinds of temperature-waveforms (fast heating and fast cooling, slow heating and slow cooling, slow heating and fast cooling) under temperature cycling between 350-650℃ and by isothermal low-cycle fatigue tests at 650℃ under cyclic frequencies of 0.5〜0.039 cpm. The following results were obtained. (1) The effect of frequency on fatigue life in out-of-phase thermal fatigue was as small as in isothermal low-cycle fatigue, whereas in in-phase thermal fatigue it was much greater and the fatigue life reduction was more remarkable in low frequency. (2) The effect of temperature-and strain-waveform on thermal fatigue life was still smaller than the effect of frequency on out-of-phase thermal fatigue life. (3) The fracture mode of out-of-phase thermal fatigue was the transgranular type even at the lowest frequency tested, but that of in-phase thermal fatigue changed to the intergranular type at low frequency. (4) Out-of-phase and in-phase thermal fatigue data obtained at the test condition of such an extremely low frequency as 0.039 cpm were found to coincide well with Δε_<pc>-N_<pc> and Δε_<cp>-N_<cp> relations, respectively.
社団法人日本材料学会の論文
1983-06-15