(A) study on the effect of environmental variables on the crack growth behavior in SA508Cl.3 pressure vessel steel = 환경인자가 SA508 Cl.3원자로 압력용기강의 균열성장거동에 미치는 영향에 관한 연구

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In order to assess the susceptibility of the Environmentally Assisted Cracking (EAC) on SA508 Cl.3 steel in primary water condition, polarization test and Slow Strain Rate Test (SSRT) were conducted in a simulated crack tip condition with various environmental variables at room temperature. Corrosion potential shifted upward with the addition of oxygen, thus it facilitated EAC behavior. But the effect of sulfur was negligible. This explains the thermally activated reaction of sulfur. EAC susceptibility was dominant with the applied potential and acidity because of the pitting phenomenon as well as anodic dissolution. Ford-Andresen model to predict EAC growth behavior is applicable at high temperature condition because the model needs oxide/passive film ahead of crack tip. Thus it fails to explain the system where oxide/passive film were suppressed. Proposed simple dissolution model is a modification of the Hishida``s anodic dissolution model at the plastic zone. It has an assumption of the similarity between round-bar tensile specimen and tensile ligament at the crack tip. Finally, this model can be used regardless of oxide/passive film. Also it explains region II-K independent nature. Comparison with the actual data shows a good agreement
Advisors
Hwang, Young-SeokresearcherKim, In-Supresearcher황용석researcher김인섭researcher
Description
한국과학기술원 : 원자력공학과,
Publisher
한국과학기술원
Issue Date
1998
Identifier
133482/325007 / 000963159
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 원자력공학과, 1998.2, [ vi, 52 p. ]

Keywords

Anodic dissolution; Crack propagation; 환경 유기 파괴; 저합금강; 양극용해; 균열성장; Environmentally assisted cracking; Low alloy steel

URI
http://hdl.handle.net/10203/49379
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=133482&flag=dissertation
Appears in Collection
NE-Theses_Master(석사논문)
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