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Effect of irradiation on the stress corrosion cracking behavior of Alloy X-750 and Alloy 625.

机译:辐照对合金X-750和合金625应力腐蚀开裂行为的影响。

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摘要

In-reactor testing of bolt-loaded precracked and as-notched compact tension specimens was performed in 360(degrees)C water to determine effect of irradiation on SCC of Condition HTH and Condition BH Alloy X-750 and age-hardened Alloy 625. Variables were stress intensity factor (K(sub I)) level, fluence, grade of HTH material, prestraining and material chemistry. Effects of irradiation on high temperature SCC and the rapid cracking that occurs during cooldown below 150(degrees)C were characterized. Significant degradation in the in-reactor SCC resistance of HTH material was observed at initial K(sub I) levels above 30 MPa(radical)m and fluences greater than 10(sup 19) n/cm(sup 2) (E > 1 MeV). A small degradation in SCC resistance of HTH material was observed at low fluences (20 ppM). Age-hardened Alloy 625 exhibited superior in-reactor SCC behavior compared to HTH material as no crack extension occurred in any of the precracked Alloy 625 specimens tested at initial K(sub I) levels up to 80 MPa(radical)m.

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