炭素鋼のき裂進展に及ぼす高圧水素ガス雰囲気の影響(<特集>フラクトグラフィ)

概要

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The fracture toughness and fatigue crack growth properties of carbon steel (S35C) were investigated in 1.1 MPa argon gas and in high pressure hydrogen gas up to 9.9 MPa at room temperature. The effect of hydrogen on the crack growth was discussed. The results obtained are as follows; (1) JIH value in hydrogen was smaller than JIC value in argon and decreased with increasing hydrogen pressure. The quasi-cleavage fracture was observed on the surface fractured in hydrogen, but no stretched zone was observed. (2) The fatigue crack growth rate in hydrogen was larger than that in argon and increased with increasing hydrogen pressure. The mixture of quasi-cleavage fracture and intergranular fracture was mainly observed in hydrogen. (3) The critical plastic deformation for the crack growth in hydrogen was smaller than that in argon. The cracks in hydrogen were the quasi-cleavage or intergranular fracture instead of the stretched zone or striations in argon.
1997-06-15