超音波疲労による金属材料の機械的性質の変化
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The changes in mechanical properties of carbon steel fatigued ultrasonically at 17 kHZ have been investigated. The results were compared with those fatigued by the rotary bending test at 3000 rpm. The following conclusions are obtained : (1) The fatigue life of carbon steel cycled at 17kHz is longer than that of the same material fatigued at 3000 rpm. This is more pronounced in annealed (An.) materials than in low-temperature quenching (LTQ) ones. (2) The variations of hardness Hv and residual stress ~i during the fatigue test are smaller at 17 kHZ than at 3000 rpm fatigue. (3) The variations of both Hv and σ_i for S10C (0.1%C) during the fatigue test at 17kHz are slightly smaller than those for S45C (0.42%C). In the case of 3000 rpm fatigue, however, these variations values for S10C are fairly larger than those for S45C. (4) In both 17kHz and 3000 rpm tests, the amounts of change in Hv, σ_i and E become larger as the stress amplitude increases. (5) In the fatigue process at 3000 rpm, the amount of change in Hv of LTQ specimen is larger than that in Hv of An. specimen. However, there is no significant difference between them in the process of 17 kHz fatigue. (6) The number of slip lines produced on the specimen surface fatigued at 17kHz is far fewer than that at 3000 rpm, especially in LTQ materials. However, the number of cracks is not so different between them. It is confirmed that those characteristics may influence the hardness and Young's modulus. (7) The relationship between the hardness and the residual stress can be expressed as follows: Hv = Hv0 + e^<kσ_i> where k is a constant which depends upon the kind of materials, working conditions and fatigue testing conditions. This equation, however, is not applicable to the later stage of the fatigue test nor to the quenched materials. (8) The relationship between the residual stress and Young's modulus can be expressed as follows : σ_i = K_1E_tE_<st>/ΔE (σ_i>0.5 kg/mm^2 in carbon steel) where ΔE=E_<st>-E_t: E_<st> being Young's modulus in saturation magnetization and E_t being Young's modulus in non-magnetization.
- 社団法人日本材料学会の論文
- 1975-08-15
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