繰返し応力のもとでひずみ時効した鋼の疲労強度

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To investigate the effect of cyclic-strain aging on the fatigue strength of carbon steel, two kinds of cyclic-strain-aged carbon steel were fatigued in rotating bending at room temperature as well as at elevated temperatures. The annealed and surface-rolled specimens were aged at 375'C and 250'C during cyclic stressing above or below the fatigue limits. The strengthening effect due to the aging treatment depends on the aging conditions; the temperature, the cyclic stress amplitude and the number of cycles. The strain-aging treatment at 375℃ raises the fatigue strength at room temperature. The strengthening effect at room temperature through the aging treatment in the range of cycles 5.9×10^3〜3.2×l0^6 under the stress just below the fatigue limit at 375℃ is independent of the number of cycles at 375℃. In the range of stress 1.15S_w〜0.58S_w for 5. 9×10^3 cycles at 375℃, the higher the stress level at 375℃ the more effective the strengthening effects. The strengthening effect through the treatment at 250℃ is less than at 375℃ and depends on the number of cycles at 250℃. It can be considered that there is not a substantial difference in the strengthening effect through strain aging between annealed and surface-rolled conditions although the surface-rolled specimens have the strongly hardened layers and the residual stress, but that there is a large difference between the treatment at 375℃ and 250℃. The strengthening effect seems to be based on dislocation-solute interaction which operates afresh at each cycle at 375℃, and on any cumulative effect of aging at 250℃.
社団法人日本材料学会の論文
1974-09-15

繰返し応力のもとでひずみ時効した鋼の疲労強度

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