高周波焼入れの疲れ強さに関する影響についての-実験 : その3

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The authors have conducted fatigue tests on induction hardened V-notched specimens (ρ=0.25mm, 0.5mm, 1mm and 5mm) with C=0.13% steel. Induction-heating temperature was chosen 700℃, 800℃, 900℃, 1000℃, and 1100℃. The experimental results may be summarized as follows : (i) There is a favourable difference between σ_<w1>and σ_<w2>, when ρ is 0.25mm, 0.5mm, or 1mm; but no difference between σ_<w1>and σ_<w2> at ρ=5mm. (ii) The absolute values of σ_<w2> reach a maximum at 1100℃, and decrease as the heating temperature decrease. The value of σ_<w1> at 1100℃ is higher then that at the other temperatures, but the values of σ_<w1> show no difference from those at other temperatures. The values of σ_<w1> andσ_<w2> are almost proportional to the hardness at the notched-bottom, within the range of these experiments. (iii) For discussion of the crack-development, we calculated the stress of crack-tip with simple form, and examined the simple relation between the calculated-stress and hardness.
一般社団法人日本機械学会の論文
1963-04-25