低温焼入による鋼の材質の変化について : (第5報)鋼の時効硬化能と疲れ強さ

概要

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The low-temperature quenching is greatly effective on improvement of the fatigue strength of steel, and the effect is more remarkable in notched specimen than in plain one. The reason for this was discussed on the basis of the strain-age-hardening of the ferrite, which took place during repeated loading. In spite of their low strength and hardness, the fatigue strength of low-temperature quenched steel is higher than that of tempered ones, because the low-temperature quenched steel has a higher age-hardening power. It may be concluded that the age-hardening power of the ferrite is one of the most important factors to control the fatigue failure as well as slip resistance of material does, and in notched specimen, the former is rather dominant factor than the latter. And it may be emphasised that the sharp notches in machine parts are not so harmful if the age-hardening power of the material is high enough.
社団法人日本機械学会の論文
1958-07-25