材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
高張力鋼切欠き底からの応力腐食割れ発生特性
津田 政明広瀬 幸雄矢島 善次郎田中 啓介
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1990 年 39 巻 442 号 p. 952-957

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Stress corrosion tests were conducted on the notched compact tension specimens of quenched-tempered SNCM 439 steel in three kinds of environmental solution: distilled water, 3.5%NaCl, and 0.1N H2SO4. The crack nucleation behavior was analysed from a view point of fracture mechanics. The results obtained are summarized as follows;
(1) Time to crack nucleation tn of the notched specimens with various root notch radii was determined by a parameter of Kρ/(ρ+ρ0)1/2, where Kρ is the apparent stress intensity factor, ρ is the notch root radius and ρ0 is the intrinsic notch root radius. The life got shorter as the hydrogen content became larger in the order of distilled water, 3.5%NaCl, and 0.1N H2SO4.
(2) Stress corrosion cracks were formed from the notch on three different planes: the original notch plane and two inclined planes to the notch. The crack plane changed depending on environments, notch-root radii and stress levels. Two inclined planes of crack initiation from the notch agreed with the plane of the maximum shear stress.

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