SUS 310S鋼単結晶の応力腐食割れとその結晶学的研究(<小特集>腐食防食小特集)

概要

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The effect of tensile axis on stress corrosion cracking (SCC) of SUS 310S steel single crystals in a boiling MgCl_2 solution(42%) at 416K was studied under the constant-loading conditions. The threshold stress for SCC decreased in order of tensile axes of [111], [101] and [001], and was independent of Schmidt factors for the primary slip system. Cracks were preferentially nucleated from the micro-pits at slip steps by plastic deformation and grew along the < 110> direction on the {100} plane in every type of specimens. The fracture surface of [001]-oriented specimen was observed to be flat, but those of the rest contained steps composed of other {100} planes, too. It was found that the normal stress to the {100} crack plane vs. fracture time curves in all types of specimens conceded well. This fact suggests that the crack growth is strongly controlled by the normal stress to the {100} plane which makes the smallest angle with respect to the tensile axis.
社団法人日本材料学会の論文
1988-01-15