オーステナイト系ステンレス鋼SUS 304, 321の高温低サイクル疲労に及ぼすひずみ波形の影響
1979 年 65 巻 7 号 p. 906-915
詳細
1979 年 65 巻 7 号 p. 906-915
The influence of strain-wave form on the low-cycle fatigue life of type 304 and 321 stainless steels was studied at 650 and 700°C. Fully reversed strain-controlled low-cycle fatigue tests were conducted with a symmetrical triangular, a trapezoidal and an asymmetrical triangular wave form.
The effect of creep-fatigue interaction was analyzed by the strain-range partitioning approach. The micro-structural change during the test was also observed and its effects on the fatigue life were discussed considering the mode of fatigue crack growth and the environmental effects.
It was found that the creep-fatigue properties Δ∈pp-Npp and Δ∈cp-Ncp of 304 steel are the same as those of 321 steel, but the other effects such as the micro-structural change, environment and so on is greater in 321 steel than in 304 steel in such test as with trapezoidal strain-wave form of long hold time.
