Effects of hydrogen concentration on fracture toughness of CANDU pressure tube = 수소 농도의 영향에 대한 CANDU 압력관의 파괴인성 변화

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The effects of hydrogen concentration on the axial fracture toughness of Zr-2.5 wt% Nb CANDU pressure tube material have been determined from room temperature to 300℃. The specimens was charged to 50, 100, 150, 200ppm of hydrogen. To observe hydride morphology and measure volume fraction, optical microscope was used. The crack growth during fracture toughness test was measured by direct current potential drop method. Fracture toughness characterized by J-R curve and dJ/da was discussed in terms of hydrogen concentration. As hydrogen concentration increased, hydride volume fraction, thickness and length increased. However, interhydride spacing remained nearly constant. At room temperature, fracture toughness decreased rapidly with increasing hydrogen concentration until hydrogen concentration was below 100ppm. However, fracture toughness remained at a similar level at above 100ppm. Ductile-brittle transition temperature increased slightly when hydrogen concentration increased. At high temperature, fracture toughness also decreased because yield stress increased by hydride volume fraction.
Advisors
Kim, In-Sup김인섭
Description
한국과학기술원 : 원자력양자공학과,
Publisher
한국과학기술원
Issue Date
2002
Identifier
174277/325007 / 020003314
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 원자력양자공학과, 2002.2, [ ii, 52 p. ]

Keywords

hydride; hydrogen; Zr-2.5Nb; fracture toughness; 파괴인성; 수소화물; 수소; 지르코늄

URI
http://hdl.handle.net/10203/49445
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=174277&flag=dissertation
Appears in Collection
NE-Theses_Master(석사논문)
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