X線による切欠き材の疲労破壊に関する研究(細束X線による冷間圧延加工した低炭素鋼材における疲労の観察 I)

概要

論文の詳細を見る
The mechanism of fatigue fracture in metallic material is thought to be independent of its initial condition in itself. In other words, a monotonously varing parameter, which represents the fatigue progress of material with any initial treatment, should be considered. Considering this, the authors intended to study on crystal deformation during the fatigue process of low-carbon steel specimens, which were treated in a different manner before the fatigue test, by means of the back-reflection X-ray microbeam diffraction technique because this technique made it possible to perform an quantative investigation on deformation of grain and subgrain distinctively. In this publication, they dealt with the results of investigation on the fatigue process preceding the macro crack initiation of cold-rolled low-carbon steel specimens with different reduction percent. They were itemized as follow. (1) The number of sharp spots in an arc diffracted from a grain increased and the intensity of its back ground darkness decreased relatively, as the fatigue process progressed. On the other hand, an arc diffracted from a specimen subjected to cyclic stress under the fatigue limit made no considerable change.
社団法人日本材料学会の論文
1966-12-15