高力ボルト表面の脱炭および浸炭層が遅れ破壊および疲労破壊に及ぼす影響

概要

論文の詳細を見る
In general, some carburized or decarburized layer is formed at the bolt surface by heat treatment. It has been already known that the carburized and decarburized surface layers of the steel affect the characteristics of the delayed fracture and the fatigue fracture. But the specimen shape used usually in the experiments is different from the bolt, and the degree of carburizing and decarburizing is greater than that of bolt. Therefore, it is necessary to examine the effect by using practical bolt specimens. In this study, to investigate the above problems, the delayed fracture test and the fatigue test were performed on the bolt specimens having carburized or decarburized surface laver. It was found that decarburizing at the surface layer of the bolt had a good effect on the characteristic of delayed fracture but no effect on the fatigue fracture.
1989-02-15