金属材料のバウシンガー効果におよぼす異種加工の影響

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Twisting the thin-walled cylindrical specimens of 0.55% carbon steel and α brass around their axes until a constant amount of the shear strain was produced and then unloading them, we added various axial tensile strains. From the change of the proportional limit gained by twisting the specimens again in the reverse direction to the initial torsion, the following facts were ascertained:　1 The propoprtional limit of reverse-directed torsion rises with the progress of the plastic tensile deformation.　2 The rising process of the proportional limit is clearly divided into two stages according to the increase of plastic tensile strain.　3 Even a slight plastic tensile deformation causes a steep rise, though in a small degree, of the proportional limit of torsion in the reverse direction. It is supposed that this is due to the removal of the Bauschinger effect as a result of the axial tensile strain. This is the change of the first stage.　4 The proportional limit keeps on rising in accordance with the increase of the tensile strain, but at a certain value of the tensile strain, the rise becomes suddenly inactive and the modulus of rigidity begins to decrease. This change in the second stage is considered to have originated in the texture which has developed with the tensile deformation.　5 We conjecture that in the change of the first stage the hardness of metal is increased because of the removal of the Bauschinger effect, while in the change of the second stage, as a new texture is brought about and the Bauschinger effect rises afresh, the hardness of metal is decreased at first, and then, with the development of the new texture it is increased again because of the strain hardening.
山形大学の論文
1959-02-28

金属材料のバウシンガー効果におよぼす異種加工の影響

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