加工した炭素鋼の繰返しねじりによるバウシンガー効果の変化

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The present test was carried out on the 0.37% carbon steel specimens that were plastically twisted at a room temperature and aged under stress at 350℃., in order to investigate the changes of the proportional limit, the yield strength and the hardness due to pulsating or completely reversed torsional stress cycles. Particularly, the proportional limit and the yield strength were measured not only in the same direction as pre-torsion but also in the reverse direction. Subsequently, the same experiment was carried out to study whether the similar changes are caused when these specimens are heated at comparatively low temperatures. The results obtained may be summarized as follows : (1) When the specimens were subjected to reversed torsional stress, the proportional limit and the yield strength decreased in the same direction as pre-torsion, while they increased in the reverse direction, and it was confirmed that the Bauschinger effect diminished appreciably. (2) The above changes of mechanical properties due to repeated stress were more remarkable in the early stage of stress cycles and became nearly constant after some number of cycles. It seems that the relation between the direction of pre-torsion and that of development of the fatigue deformation may be explained by such changes in mechanical properties. (3) The Bauschinger effect could be diminished by heating cold-worked specimens at comparatively low temperatures. (4) Aging treatment under pulsating stress cycles was more effective in promoting age-hardening as compared with the case of strain aging or of aging under static stress. But, in our test, plastically pre-twisted specimens had been softened slightly by completely reversed stress cycles at a room temperature.
社団法人日本材料学会の論文
1959-11-15

加工した炭素鋼の繰返しねじりによるバウシンガー効果の変化

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