α鉄のクラック伝播挙動におよぼす水素の影響

概要

論文の詳細を見る
The effect of hydrogen on the crack propagation behavior and the microstructures around cracks in α-iron has been examined by means of tensile testing with simultaneous charging of hydrogen and microscopic observation. The results obtained are summarized as follows : (1) The yield strength and the flow stress at 2% strain increase by absorbing hydrogen, whereas the fracture strain and the total energy spent in the tensile test decrease remarkably. (2) According to the notch tensile tests, the force for crack initiation does not change so much with the increase in hydrogen content, but the plastic strain induced around crack and the amount of wark required for the propagation of cracks decrease notably with increasing the hydrogen content. (3) Near the crack edge in notched specimen deformed under uncharged condition, well-defined cell walls which are elongated along the crack edge are observed. As the hydrogen content increases, the distribution of dislocations becomes uniform, the formation of well-developed cell structure is suppressed and the dislocation density slightly increases, indicating the difficulty in relaxation of stress concentration around cracks of α-iron. (4) It is suggested that the hydrogen embrittlement of α-iron is mainly due to the lowering of deformability in the vicinity of cracks by the absorption of hydrogen and the easy initiation of the grain boundary cracking caused by the segregation and precipitation of absorbed hydrogen.
社団法人日本鉄鋼協会の論文
1979-04-01

α鉄のクラック伝播挙動におよぼす水素の影響

スポンサーリンク

概要

著者

関連論文

スポンサーリンク