18 Cr-8 Niオーステナイト系ステンレス鋼予ひずみ材のX線的弾性定数測定(<小特集>X線材料強度小特集)

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In the previous paper, the value of constant K_x(-34.10±1.7 kg/mm^2/deg) needed for the X-ray stress measurement of 18 Cr-8 Ni austenitic stainless steel was determined with high accuracy from T (311) diffraction of CrKβ radiation by the ψ_0 oscillation method. However, the study on stainless steel which has been subjected to severe plastic deformation has not been made so far. In this study, the X-ray elastic constants of tensile pre-strained 18-8 stainless steels were measured by the η oscillation method with CrKβγ311) diffraction, and by theψ_0 oscillation method with CrKoiγ(220) diffraction, and the accuracy of the measurement was examined. The results are summarized as follows. (1) From a view point of accuracy, it is desirable to apply the η oscillation method for γ(311) diffraction of CrKβ radiation and the η oscillation method for the CrKαγ(220). (2) In the CrKβγ(311) ψ_0 oscillation method, the absolute value of the constant Kx increases slightly with pre-strain in the range of small pre-strain but it reaches a certain saturated value when pro-strain becomes large. In the CrKαγ(220)η oscillation method, it decreases gradually with increasing pre-strain. The latter results can be qualitatively explained by taking the tensile deformation texture into analysis, though in the former case a clear explanation has not been made. (3) For the X-ray stress measurements of some unknown pre-strained stainless steels of which the diffraction intensity curve from CrKβγ(311) diffraction is known to be practically uninfluenced by CrKα α(211) diffraction, the K-value for 18-8 stainless steel reported previously (K_x=-34.10kg/mm^2/deg) is considered appropriate in practical use, and the error of measurement is at most 10 per cent.
1979-03-15

18 Cr-8 Niオーステナイト系ステンレス鋼予ひずみ材のX線的弾性定数測定(<小特集>X線材料強度小特集)

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