18 Cr-8 Ni オーステナイト系ステンレス鋼のX線応力測定

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There are very few reports about X-ray stress measurement of austenitic stainless steel and consequently, there exist many problems which must be clarified. In the present study, the X-ray stress measurement of seven kinds of specimens (grain size number 7.2〜7.0) obtained by various treatments from cold-rolled 18 Cr-8Ni austenitic stainless steel plate were carried out by following heat the standard method used for ferritic steel, and their X-ray elastic constants, constant K and accuracy of measurement were determined by using different diffraction planes with Cr Kα, Cr Kβ the radiations and two methods of X-ray incidence. The results are summarized as follows: (1) The error in stress measurement of ten incident angles by the fixed ψ method with γ(311) diffraction of Cr Kβ radiation is from ±2.17 to ±9.91 kg/mm^2, or the average of ±5.85kg/mm^2 if the limit of confidence is set at 95 per cent, and the X-ray elastic constants and constant K are, [numerical formula] [numerical formula] [numerical formula] respectively. The mean error by the usual measurement of four incident angles is ±11.60kg/mm^2. (2) The mean errors of measurement by the fixed ψ method with Cr Kβ γ(311) diffraction and the fixedψmethod with Cr Kα γ(220) diffraction are ±9.33 kg/mm^2 and ±24.11 kg/mm^2 respectively. The accuracy of the measurement by the latter is insufficient for practical usage. (3) In the measurement using γ(311) diffraction of Cr Kβ radiation, it is very necessary that the peak intensity of diffracted X-ray is increased in order to minimize the error, and that the recorder is equipped with differential curcuit for bringing down the back-ground because its intensity tends to become high. (4) It seems that chromium carbides precipitated in grain boundaries or a trace of martensite in austenite do not cause the error in stress measurement to increase.
1975-01-15

18 Cr-8 Ni オーステナイト系ステンレス鋼のX線応力測定

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