The Effects of Metallurgical Factors on Fatigue Strengths : Part 1, The Effects of Carbon and the Relations between Static Strengths and Fatigue Strengths

抄録

The purpose of this investigation if to clarify the effects of alloying elements and heat treatments on fatigue strengths of steels quantitatively with correlation equations among the fatigue limit, static strength and metallurgical factors.On the analogy with the case of static strengths, a regression equation is assumed between the fatigue limit and the amount of alloying elements, and effects of carbon and heat treatments are described in this report.There exists a more general relationship between σ_w and σ_s than between σ_w and σ_B. It can be written as foloows; σ_w(α, T)=K(e₁, α, T)σ_s(T)+H(e, α, T). H is a function of alloying elements e, stress concentration factor α and heat treatment T. If carbon is taken as e₁, one of the alloying elements, K is nearly constant within a broad range of heat treatments.