18Cr-8Niオーステナイト系ステンレス鋼のX線的弾性定数 (<小特集>X線材料強度小特集)

概要

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The X-ray elastic constants of 18Cr-8Ni austenitic stainless steel were determined accurately from γ(311) diffraction of CrKβ radiation by the ψ_0 oscillation method using a X-ray diffraction stress analyzer, and the amount of scatter in the measured values was examined. The results obtained are summarized as follows : (1) The value of constant K for 18-8 stainless steel is -34.10kg/mm^2/deg, and the error in stress measurement, the error of K-value and the range of scatter of K-value are ±0.86 kg/mm^2, ±1.7kg/mm^2/deg and 1.3kg/mm^2/deg, respectively, if the limit of confidence is set at 95%. This K-value is considered appropriate in practical use for fine grain steels which have not been subjected to severe plastic deformation. (2) Even if the error in stress measurement Δσ is small, the amount of scatter in the measured values increases depending upon the conditions of diffraction peak intensity, grain size, texture, working history and the surface properties of test specimen. It is, therefore, necessary to evaluate the X-ray stress value by taking these conditions into consideration.
1978-03-15