テーパ形 DCB 試験による Ni 添加鋼板の脆性破壊伝播停止特性について

概要

論文の詳細を見る
Brittle fracture propagation-arrest characteristics of low C-Mn steel plates containing 0∿5%Ni have been investigated by newly developed Tapered Double Cantilever Beam Test, which is a small size test having good correlation to large size Double Tension Test. The results obtained are as follows : 1) Brittle fracture propagation-arrest characteristics are linearly improved with the increase of Ni content, whichever in normalized or quenched and tempered steel plates. Bainitic structure which gives deleterious effect on Charpy impact characteristics do not affect brittle fracture propagation-arrest characteristics. 2) Refinement of microstructure by heat treatment improves greatly Charpy impact characteristics, but very slightly brittle fracture propagation-arrest characteristics. 3) As a whole, brittle fracture propagation-arrest characteristics shows the behavior different from Charpy impact characteristics. The former is sensitive to the change of chemical compositions (Ni content) and insensitive to the change of microstructures (bainitic or refined structures).
社団法人日本鉄鋼協会の論文
1975-04-01