304ステンレス鋼の応力腐食割れ破断寿命の確率分布に及ぼすCaCl_2濃度の影響(<小特集>腐食防食)

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In order to compare the failure time distribution of a laboratory accelerated test with the field failure time distribution of stress corrosion cracking of Type 304 stainless steel, the effect of CaCl_2 concentration on the probability distribution of the failure time T_f, crack initiation time T_i and crack propagation time T_p for smooth plate specimens with or without crevice under a constant condition of 373K and 200 MPa has been analyzed. Two parameter Weibull distribution fitted approximately to all the distributions obtained. The apparent shape parameter m_i^' for T_i of both type of the specimens with or without crevice was found unity, indicating that a chance failure mode was operating. On the other hand, m_f^' and m_p^' for T_f and T_p show a maximum value of 4 or 6 at an intermediate concentration range of 30 or 40 mass%CaCl_2, corresponding to a wearout failure mode, and decrease to unity with a decrease of CaCl_2 Concentration. This fact means that SCC fracture and propagation at a low concentration range take place by a change failure mode. Since the same chance failure mode had been reported for the field failure time distributions of Type 304 and 316 stainless steel heat exchanger tubes, an approximate acceleration factor of the laboratory test con-ducted under the condition of 25 mass%CaCl_2, 373K, 200 MPa with crevice was estimated to be ca. 10^4 by comparing the mean failure time of both distributions of the field and the accelerated test.
社団法人日本材料学会の論文
1987-01-15

304ステンレス鋼の応力腐食割れ破断寿命の確率分布に及ぼすCaCl_2濃度の影響(<小特集>腐食防食)

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