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00195 STRESS-CORROSION CRACK INITIATION BEHAVIOR IN alpha-TITANIUM USED FOR NUCLEAR WASTE DISPOSAL OVERPACK

Product Number: 51300-00195-SG
ISBN: 00195 2000 CP
Author: Nofiko Nakamura, Masatsune Akashi, Yuichi Fukaya and Guen Nakayama
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Stress-corrosion cracking initiation and propagation behavior of single alpha-phase titanium alloys was investigated in an hydrogen generation electrode region for a long duration. According to the X-ray diffi'action peaks, titaafium hydride was found on the surface of the specimens. A definite relationship between formation of hydride phases and crack initiation was concluded based on microscopic observation of surfaces and cross sections of samples. A layer of titanium hydride started to grow from the titanium surface to the interior. When the thickness of the layer reached a critical value, the hydride layer was fractured mechanically. Then, a hydride layer started to grow at the tips of the crack formed, and the newly formed hydride layer starts cracking mechanically. Keywords: alpha-phase titanium alloy, stress-corrosion cracking, hydride
Stress-corrosion cracking initiation and propagation behavior of single alpha-phase titanium alloys was investigated in an hydrogen generation electrode region for a long duration. According to the X-ray diffi'action peaks, titaafium hydride was found on the surface of the specimens. A definite relationship between formation of hydride phases and crack initiation was concluded based on microscopic observation of surfaces and cross sections of samples. A layer of titanium hydride started to grow from the titanium surface to the interior. When the thickness of the layer reached a critical value, the hydride layer was fractured mechanically. Then, a hydride layer started to grow at the tips of the crack formed, and the newly formed hydride layer starts cracking mechanically. Keywords: alpha-phase titanium alloy, stress-corrosion cracking, hydride
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