Factors affecting primary water stress corrosion cracking initiation of Ni-Cr-Fe alloy = Ni-Cr-Fe계 합금의 일차수응력부식균열 생성 저항성 영향 인자 연구

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Nickel alloys are widely used as the pressure boundary components of pressurized water reactors (PWRs) because it has good mechanical strength and excellent corrosion resistance. However Alloy 600 was revealed as susceptible to primary stress corrosion cracking (PWSCC) and it became the one of the important material degradation mechanism in PWRs. In this study, oxide layer of nickel alloy was investigated and PWSCC initiation test was conducted using 3 heats of Alloy 600 and Alloy 690 each. Nickel alloy’s oxide layer was identified as double layer such as outer layer and inner layer. The morphology and the thickness of oxide layer were varied as dissolved hydrogen concentration and zinc injection. It was expected that chromium rich inner layer played important role on the corrosion resistant performance. Alloy 600 PWSCC initiation test results were discussed with the effects of several factors like chemical composition, mechanical strength and grain boundary characters. In this study grain boundary mis-orientation was considered to be the most dominant factor affecting the Alloy 600 PWSCC resistance. However crack was not developed at Alloy 690 material after the long term test. PWSCC initiation factor of improvement of Alloy 690 to Alloy 600 is suggested to 20.
Advisors
Jang, Chang Heuiresearcher장창희researcher
Description
한국과학기술원 :원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2018
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 원자력및양자공학과, 2018.2,[iv, 95 p. :]

Keywords

Alloy 600▼aalloy 690▼aalloy 182▼aoxide layer▼aPWSCC▼acrack initiation; Alloy 600▼aalloy 690▼aalloy 182▼a산화막▼a일차수응력부식균열▼a균열 생성

URI
http://hdl.handle.net/10203/265062
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=734495&flag=dissertation
Appears in Collection
NE-Theses_Ph.D.(박사논문)
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