X 線回折による結晶粒度自動測定技術の開発

概要

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We have developed the technique by which the grain size of austenitic stainless steels can be measured nondestructively and rapidly by utilizing the fact that the numbers of spots along Debye Scherrer rings relate to the numbers of grains in the area irradiated by X-ray. The principle and results of this study are as follows. 1) It is shown theoretically that the numbers of spots along Debye Scherrrer rings diffracted by X-ray relate to those of grains in the irradiated area. Thus the diameter of grains, d can be counted in principle but this can not be done by a simple method. The relative standard deviation (D) of X-ray intensities which are measured at the points distributed along Debye Scherrer rings is theoretically shown to be related to the diameter of grains and its reliability is proved experimentally. 2) The precision of proportional relation between D and d depends on sampling numbers. Larger sampling numbers give the higher precision. The number of points for intensity measurement along Debye Scherrer rings is limited by the limitation of the space, and consequently the number is enlarged by changing the measuring positions. 3) The value of D are affected by the prefferred orientation and mixture of large grains. These effects should be corrected in order to enhance the precision and this can be done mathematically.
社団法人日本鉄鋼協会の論文
1978-04-01