高力 AI 合金の動 SCC き裂進展に及ぼす材料異方性の影響

概要

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The influences of anisotropy of material on static and dynamic SSC crack growth rates including the case of part-through one have been investigated using high-strength aluminum alloy ZK 141 (JIS 7N01) sensitive to active path corrosion type SCC. As for through crack growth,the crack plane orientation had a great influence not only on the crack growth rate but also on the threshold value ; when the crack growth direction was longitudinal,i,e., in S-L and T-L specimens, anodic dissolution at grain boundaries was easily brought about,resulting in an enhancement of crack growth rate and a decrease in threshold value with respect to L-T specimens,where the crack growth direction was long transverse. This crack growth enhancement and the decrease in threshold value were especially marked on S-L specimens. Moreover, superimposed vibratory stresses had a great influence on the crack growth rate for T-L and L-T specimens. However,the dynamic SCC crack growth rate was smaller then that of static SCC for S-L specimens,with a slightly higher K_<DSCC> value than that of K_<ISCC>, which results from crack branching. In a corrosive environment,part-through static and dynamic SCC cracks grew in the longitudinal direction as well as in the surface and the depth directions. The longitudinal cracks grew under a mixed loading of Mode I and Mode II.
社団法人日本材料学会の論文
1986-06-15