マルテンサイト・ステンレス鋼SUS403-Bの回転曲げ高温疲労現象 : (<小特集>高温強度小特集)

概要

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Rotating bending fatigue tests were carried out on a martensitic stainless steel (Type 403) at room temperature, 200, 300, 400, 450 and 500℃ with a frequency of 7500 r.p.m. and the fatigue strength at 10^8 cycles was obtained by the staircase method. The results obtained are summarized as follows : (1) The endurance limits were found, and the fatigue strength at 10^7 and 10^8 cycles were identical at 200 and 300℃ and were nearly equal at room temperature and 400℃. At 450 and 500℃, the number of cycles to failure continued to increase with decreasing stress amplitude up to 10^8 cycles. (2) The ratio of fatigue strength at 10^8 cycles to 0.2% proof stress was 0.64〜0.69 at R.T. 〜500℃. (3) The coaxing effect was slightly observed in the temperature range from room temperature to 400℃. (4) the room temperature hardness at the surface of the specimens endured 10^8 cycles at high temperatures from 200 to 400℃ was larger than that of a virgin specimen. (5) The strengthening of the material is considered to be caused by dynamic aging the fatigue test at 200〜400℃. This phenomenon can be pointed out as a reason why endurance limits were found and the coaxing effect was observed in this temperature range.
社団法人日本材料学会の論文
1977-03-15