高強度鋼の低サイクル疲労特性

概要

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Low-cycle fatigue properties were investigated for low-alloy steels differently heat-treated to obtain strength levels of 2 000, 1 500, and 1 000 N/mm^2. The results were compared with those reported in the previous works where 15 grades of carbon steels, low-alloy steels and stainless steels (σ_B=470〜1 100 N/mm^2) were examined, on the basis of cyclic softening or hardening behavior, cyclic stress-strain relationship and strain-life properties. SNCM 439 steel was cyclically stable when tempered at 200℃, while those tempered at 400 and 600℃, as well as other tempered-martensitic steels, cyclically softened. The relationship between total stain amplitude, ε_<ta>, and number of cycles to failure, N_f, was independent of material at the low-cycle region of N_f<10^4 cycles. The Coffin-Manson relation was not satisfied for all the tempered-martensitic steels. This behavior was explained by a model assuming that the plastic strain was concentrated at the ferritic portion in the tempered-martensitic microstructure.
社団法人日本機械学会の論文
1986-08-25