格子ひずみの回折面依存性に関する共同研究結果

抄録

It is one of the problems of X-ray stress measurement that the lattice strain measured by X-ray method depends on diffraction plane. Concerning this problem, cooperative works were made by the division of X-ray stress and strain measurement. The specimens obtained from six kinds of common materials, pure irons of 15μ, 30μ, 50μ in grain size, normalized, and quench-tempered medium carbon steels and normalized eutectoid carbon steel, were distributed among the members of the cooperation, and their X-ray elastic constants, ((1+ν)/E)_X-ray and (ν/E)_X-ray, were measured by using various diffraction lines.
The results are as follows:
(1) Average values of whole specimens are,
((1+ν)/E)_X-ray=5.62±0.14×10^-5mm²/kg
(ν/E)_X-ray=1.20±0.07×10^-5mm²/kg
with (211) diffraction of CrK_α and
((1+ν)/E)_X-ray=7.18±0.17×10^-5mm²/kg
(ν/E)_X-ray=1.72±0.09×10^-5mm²/kg
with (310) diffraction of CoK_α.
These are about the mean of the theoretical values calculated on the assumption of stress constant model (Reuß model) and of strain constant model (Voigt model).
(2) In no constant there is any significant difference to be recognized as due to the microstructures of materials.
(3) Dependency on diffraction plane is recognized in all of these materials, and it is about half of that of Reuß model.