黒心可鍛鋳鉄の脆性について
スポンサーリンク
概要
- 論文の詳細を見る
With the view of investigating the behavior of embrittlement of blackheart malleable iron, Charpy impact tests were carried out for series of specimens. The influences of phosphorus and/or nitrogen content, quenching temperature, holding time, and cooling rate were studied on the brittleness of these irons. Micro hardness test was also carried out on the ferrite grain interiors and its boundaries of irons subjected to a variety of treatments. Various kinds of surface analyzers such as IMA, ESCA, and AES are utilized for the analysis of the grain boundary fracture surfaces of the embrittled blackheart malleable iron. The results obtained are as follows. (1) Phosphorus has a close relationship to the embrittlement of blackheart malleable iron, while nitrogen appears not to give rise to brittle fracture. (2) Holding at 450℃ results in the embrittlement of the iron. (3) The reversibility between brittle and ductile fracture is confirmed on the impact values. (4) Quenching from 650℃ before 450℃ embrittling treatment retards the appearance of brittle fracture in the iron having higher content of phosphorus. (5) Micro hardness test shows that an embrittled iron has a little increment of hardness at grain boundary, compared with that of grain interior of the same iron. (6) The remarkable segregation of phosphorus in the grain boundary of the embrittled iron is recognized by means of IMA, ESCA, and AES analyses.
- 社団法人日本鉄鋼協会の論文
- 1978-05-01
著者
関連論文
- 鋳造成形による構造用セラミックス焼結体の寸法制御
- 球状黒鉛鋳鉄の鋳物表面における異常黒鉛層の生成に及ぼす球状化処理の影響
- 2段オ-ステンパ処理球状黒鉛鋳鉄のベイナイト変態機構 (残留オ-ステナイトの上手な使い方-続-)
- 2段オ-ステンパ処理を施した球状黒鉛鋳鉄の残留オ-ステナイト及びベイナイト変態挙動
- FHWロ-ルニハ-ド鋳鉄のオ-ステナイト等軸晶化の研究
- 118 軟鋼サブマージアーク溶接ビード上の特殊組織について
- りん含有フェライト黒鉛鋼の脆性
- 黒心可鍛鋳鉄の脆性に及ぼす熱処理の影響
- 黒心可鍛鋳鉄の脆性
- 黒心可鍛鋳鉄の粒界およびその近傍における構造欠陥の透過電顕による観察