静および衝撃曲げによる炭素鋼の挙動に関するX線的研究

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In this experiment, as sequel to the previous report, the residual stresses and half-value breadths were measured by the X-ray method on the specimens of carbon steels with a circular notch on one side, after the application of static or impact loads. The effects of annealing after loadings and grain sizes of the specimens were also investigated. For impact loading a simple apparatus of drop hammer type was used, and the applied bending strains at the notch root(0.2 to 1.0%) were measured with a synchroscope. The X-ray measurements were carried out by the film method using CrKα radiations at the notch root. The grain sizes obtained by various annealing treatments were ASTM No.9,6,4, and 3. The experimental results obtained are summarized as follows. In the case of static or impact loading, both the residual compressive stresses and half-value breadths increased with applied strains, and the increase in the latter was conspicuous in the case of impact load. The comparison with the previous compression tests gave the suggestion that the lattice distortions such as bending are larger in impact bending than in impact compression. The experimental results of annealing showed that both decreases in the residual stress and the half-value breadth are fast err for static than for impact load. The residual stresses almost disappeared after 500℃ annealing, however, half-value breadths failed to recover their original values, especially for the case of impact loading. As for the effect of grain sizes, the residual stresses were smaller and, on the contrary, the increases in half-value breadth were larger for smaller grain sizes.
社団法人日本材料学会の論文
1968-12-15

静および衝撃曲げによる炭素鋼の挙動に関するX線的研究

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