Ti-13V-11Cr-3Al合金の疲労き裂伝ぱ挙動に及ぼす水素チャージの影響

概要

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In order to investigate the influence of hydrogen on the fatigue crack propagation behavior of p -titanium alloy, two types of fatigue tests were carried out. One was the fatigue test in air on the hydrogen-precharged specimens, where the charging was carried out in H_2SO_4 aqueous solution electrolytically under the current density i_c of 1000 A/m^2 for 260 ks. Another was the fatigue test under electrolytic hydrogen-charging in H_2SO_4 aqueous solution at i_c=1000 or 3000 A/m^2. Both test results were compared with the result obtained from the fatigue test of the non-charged specimen in air. The fatigue crack propagation rate da/dN of the precharged specimen was much larger than the da/dN of the non-charged specimen in all the range of stress intensity factor, ΔK. The crack propagation rate da/dN under hydrogen charging was larger than the da/dN of the non-charged specimen only when ΔK was smaller than 15 MPa・m^<l/2>, and the da/dN was much smaller than that of the pre-charged specimen. The fatigue fracture surface of the specimens which were hydrogen-charged by both methods revealed the cleavage fracture, which corresponded to the decrease in cohesive strength of the cleavage plane of β-phase by the dissolution of hydrogen atoms.
社団法人日本材料学会の論文
1992-08-15