高強度鋼の疲労き裂発生に関する一検討
スポンサーリンク
概要
- 論文の詳細を見る
The author previously reported the fatigue crack initiation process in a low carbon Steel, and clarified that the fatigue cracks originated in ferrite grains by an intrusion mechanism. In this paper, the mechanism of fatigue crack initiation in a high strength steel was investigated using a Ni-Cr-Mo steel (SNCM 439) consisted of sorbitic structure, that is, mixed structure of farrite and granular carbide. The observations of fatigue crack initiation process were made on the surface, the longitudinal section and the fracture surface of specimens using optical and scanning electron microscopes. Then, crystallographic investigations were made on the fracture surface by the use of etch pits. Based on the experimental results, the conclusions are summarized as follow: (1) The feature of Stage I cracking was found in the fatigue crack initiation for all the specimens observed, and the initiation process could be explained by an intrusion mechanism. (2) The fatigue crack originated at a part of ferritic matrix in which granular carbides hardly precipitated, and no influence of inclusion was recognized on the initiation process. (3) Therefore, it was assumed that mechanism of a fatigue crack initiation in high strength steels with ferritic structure was essentially the same as that of a low carbon steel.
- 1983-04-15
論文 | ランダム
- 洞道監視モデルシステム (ネットワ-ク機器・システム小特集)
- 関数の考えを育成する円周率の指導について : 円周と直径の関係に注目させる円盤転がし実験の実施
- アルゴリズム構成活動の意義とその指導に関する考察 : 乗除の筆算指導を中心に
- 菅原道真の詞に投影されている白居易・原稹の唱和詞について(その二) : 『菅家文草』巻三所載「正月十六日、憶宮妓蹋歌」、「聞群臣侍内宴賦花鳥共逢春、聊製一篇、寄上前濃州田別駕」二詞の解釈をめぐって
- FBGを用いた光ファイバハイドロホンの現状について