ショットピーニングを施した鋼のX線による応力測定 : X線測定応力と公称応力の対応

概要

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The correlations between the change of stress Δσ_X measured by CrKα radiation and the nominal stress Δσ_N were investigated on shot-peened spring steel specimens in various surface conditions. Tests were made under uniform bending. Besides, the residual stress distributions in shot-peened decarburized or non-decarburized specimens were examined. In case of shot-peened decarburized specimens, the ratio Δσ_X/Δσ_N was 0.59, and the residual compressive stress measured by X-rays showed steep ascent in the surface adjacent layer up to 30μ depth. The peak of the residual stress distribution appeared at about 100μ depth from the surface, and gradually decreased thereover. When the surface layers of shot-peened decarburized specimens were electrolytically polished to 100μ, the ratio Δσ_X/Δσ_N attained to 0.86~0.88. when the residual stress of shot-peened decarburized specimens were relieved by annealing, the ratio Δσ_X/Δσ_N was 0.84~0.93, and residual compressive str ess measured by X-rays remained almost constant in the surface adjacent layer. It has been confirmed that the stress of shot-peened specimen measured by X-rays in much affected by steep residual stress distribution in the surface adjacent layer, but scarcely affected by the surface roughness.
社団法人日本材料学会の論文
1968-12-15