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EFFECT OF CRACK SIZE ON DYNAMIC SCC BEHAVIOUR OF Ti‐6A1–4V ALLOY IN 3%NaCl SOLUTION
Author(s) -
Nakajima M.,
Shimizu T.,
Tokaji K.
Publication year - 1997
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1997.tb01528.x
Subject(s) - materials science , microstructure , alloy , metallurgy , composite material
— Dynamic SCC (DSCC) behaviour of a Ti‐6A1–4V alloy has been studied for different microstructures and orientations, in 3%NaCl solution, and the effect of crack size on crack growth behaviour was discussed. Three microstructures were prepared by heat treatment, i.e. two annealed materials (AN705 and AN850) and a solution treatment and ageing (STA) material. Tests were performed at a cyclic frequency of 10 Hz and a stress ratio of 0.9 using CT specimens for long cracks ( a ≥ 24 mm) and surface‐cracked specimens for small cracks ( a ≥ 0.4 mm). The K DSCC values obtained for small cracks were considerably higher than those for long cracks in all the microstructures, that is a crack size effect in dynamic SCC behaviour was found in the Ti‐6A1–4V alloy. For small cracks, the K DSCC values for AN705 and AN850 were the same in the L and T orientations, while the K DSCC value for STA was higher in the L orientation than in the T orientation. The K ISCC values were almost the same as, or higher than, the K DSCC values.