高周波焼入れの疲れ強さに関する影響についての一実験 : その6,中空にした影響

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The authors have conducted fatigue tests on the V-notched and plain specimens (d=15 mm, C=0.37% steel). Two types of heat-treatment have been chosen : induction-hardening method and quenching-tempering. Some of these specimens were made hollow and were drilled following heat-treatment. The experimental results may be summarized as follows : 1) There is small difference in σ_<w1>, but a considerable difference in σ_<w2>, between the solid and hollow specimens which are induction-hardened, V-notched. For example, in solid specimens, σ_<w1> is 18kg/mm^2 and σ_<w2> in 56kg/mm^2,while in hollow ones (d_i=10 mm) σ_<w1> is 17kg/ mm^2 and σ_<w2> is 18 kg/mm^2. 2) There is no great difference between fatigue limit of induction-hardened solid plain specimens and that of induction-hardened hollow plain ones. 3) When the induction-hardened depth becomes larger, the fatigue strength of V-notched solid specimens becomes smaller, especially the value of σ_<w2>. But, the fatigue strength of plain specimens becomes slightly larger. 4) For quenched and tempered V-notched specimens σ_<w1> is nearly equal to (σ_<w0>/α). 5) The effects of residual stress on the fatigue strength are different depending on shapes, size of sqecimens, stress-conditions, etc., and are very much complicated.
社団法人日本機械学会の論文
1964-10-25