集合組織を有する鋼の残留応力測定

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Non-linear sin^2 relations are sometimes observed when the X-ray stress analysis was performed on the materials having preferred orientations. Therefore, the stress determination by the Sin^2ψ method is impossible for such case. There are three main factors influencing the oscillation of lattice strain with Sin^2ψ follows 1 Elastic anisotropy. 2 Plastic anisotropy and 3 ) Instrumental effect caused by the X-ray optics. This paper deals with the possibility of residual stress measurement for cold-rolled steels having a typical preferred orientation. The results obtained are summarized as follows The distribution of X-ray elastic constants with respect to Sin^2ψ the (211) diffraction was precisely calculated based on the modified Dole model and it agreed with the experimental result. 2 The experimental values of X-ray elastic constants also agreed with the analytical values for the isotropic steel by the Reuss model at Sin^2ψ and 0.75. Since the X-ray elastic strains at such positions are linear with Sin^2ψ, we can determine the elastic stresses in textured steels by using the isotropic X-ray elastic constant by the Reuss model. 3 ) A remarkable oscillation in the Sin^2ψ diagram was observed by the fixed ψ_0 method. This oscillation originated from the X-ray optics was analyzed by the numerical simulation. The result indicates that both the X-ray strains at Sin^2ψ and 0.75 on the (211) diffraction agree with those by the fixed ψ method. Thus, we proved that the residual stresses in textured steels can be measured by using both X-ray strains at such values of Sin^2ψ.
社団法人日本材料学会の論文
1988-10-15

集合組織を有する鋼の残留応力測定

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