[논문]EFFECT OF CYCLIC STRAIN RATE AND SULFIDES ON ENVIRONMENTALLY ASSISTED CRACKING BEHAVIORS OF SA508 GR. 1A LOW ALLOY STEEL IN DEOXYGENATED WATER AT 310℃

Jang, Hun; Cho, Hyun-Chul; Jang, Chang-Heui; Kim, Tae-Soon; Moon, Chan-Kook

doi:10.5516/net.2008.40.3.225

EFFECT OF CYCLIC STRAIN RATE AND SULFIDES ON ENVIRONMENTALLY ASSISTED CRACKING BEHAVIORS OF SA508 GR. 1A LOW ALLOY STEEL IN DEOXYGENATED WATER AT 310℃ 원문보기

Nuclear engineering and technology : an international journal of the Korean Nuclear Society, v.40 no.3, 2008년, pp.225 - 232

Jang, Hun (Department of Nuclear and Quantum Engineering Korea Advanced Institute of Science and Technology) , Cho, Hyun-Chul (Department of Nuclear and Quantum Engineering Korea Advanced Institute of Science and Technology) , Jang, Chang-Heui (Department of Nuclear and Quantum Engineering Korea Advanced Institute of Science and Technology) , Kim, Tae-Soon (Nuclear Engineering and Technology Institute Korea Hydro and Nuclear Power Co., Ltd.) , Moon, Chan-Kook (Nuclear Engineering and Technology Institute Korea Hydro and Nuclear Power Co., Ltd.)

Abstract ▼ AI-Helper

To understand the effect of the cyclic strain rate on the environmentally assisted cracking behaviors of SA508 Gr.1a low alloy steel in deoxygenated water at $310^{\circ}C$, the fatigue surface and a sectioned area of specimens were observed after low cycle fatigue tests. On the fatigue surface of the specimen tested at a strain rate of 0.008 %/s, unclear ductile striations and a blunt crack tip were observed. Therefore, metal dissolution could be the main cracking mechanism of the material at this strain rate. On the other hand, on the fatigue surfaces of the specimens tested at strain rates of 0.04 and 0.4 %/s, brittle cracks and flat facets, which are evidences of the hydrogen induced cracking, were observed. In addition, a tendency of linkage between the main crack and the micro-cracks was observed on the sectioned area. Therefore, at higher strain rates, the main cracking mechanism could be hydrogen induced cracking. Additionally, evidence of the dissolved MnS inclusions was observed on the fatigue surface from energy dispersive x-ray spectrometer analyses. Thus, despite the low sulfur content of the test material, the sulfides seem to contribute to environmentally assisted cracking of SA508 Gr.1a low alloy steel in deoxygenated water at $310^{\circ}C$.

주제어

AI 본문요약
AI-Helper

* AI 자동 식별 결과로 적합하지 않은 문장이 있을 수 있으니, 이용에 유의하시기 바랍니다.

가설 설정

3. From EDS analysis, high sulfur content was detected on the surfaces of the holes which were the former MnS inclusion site. In addition, brittle cracks around the holes were observed.

제안 방법

The fatigue life, N₂₅, was defined as the number of cycles at which the tensile stress drops 25 % from its peak value. After the LCF test was finished, the fatigue surface and the sectioned area of the specimen tested at 0.4% strain amplitude were observed using scanning electron microscope (SEM), and EDS analysis was performed to find MnS inclusions on the fatigue surface of the tested materials. Before the SEM observation, 나le oxides on the fatigue surface were removed with a solution containing 7 g of 2-Butyne 1.

대상 데이터

The te마 specimen was a smooth round bar type with a 19.05 mm gauge length and a 9.63 mm gauge diameter [4]. The low cycle fatigue (LCF) test system is shown in Fig.

성능/효과

2. From microstructure observation, evidence of metal dissolution, such as unclear ductile striations and the blunt crack tip, were observed mainly at a strain rate of 0.008 %/s. On the other hand, evidence of HIC, such as brittle cracks, flat facets, and micro-cracks, was observed at strain rates of 0.

참고문헌 (18)

H. Cho, H. Jang, B.K. Kim, C. Jang, and I.S. Kim, 'Environmental Fatigue Behaviors of SA508 Gr.1a Low Alloy Steel in $310^{\circ}C$ Deoxygenated Water,' Key Eng. Mater., 345-346, 1039 (2007)

상세보기
H. Cho, H. Jang. B.K. Kim, I.S. Kim, and C. Jang, 'Effect of Cyclic Strain Rate on Environmental Fatigue Behaviors of SA508 Gr.1a Low Alloy Steel in $310^{\circ}C$ Deoxygenated Water,' Adv. Mater. Res., 26-28, 1121 (2007)

상세보기
H. Cho, B.K. Kim, I.S. Kim and C. Jang, 'Low Cycle Fatigue Behaviors of Type 316LN Austenitic Stainless Steel in $310^{\circ}C$ Deaerated Water - Fatigue Life and Dislocation Structure Development,' Mat. Sci. Eng. A, 476, 248 (2008)

상세보기
H. Cho, B.K. Kim, I.S. Kim, C. Jang, and D.Y. Jung, 'Fatigue Life and Crack Growth Mechanisms of the Type 316LN Austenitic Stainless Steel in $310^{\circ}C$ Deoxygenated Water,' J. Nucl. Sci. Technol., 44, 1007 (2007)

상세보기
X.Q. Wu and Y. Katada, 'Strain Rate Dependence of Low Cycle Fatigue Behavior in A Simulated BWR Environment,' Corros. Sci., 47, 1415 (2005)

상세보기
X.Q. Wu, E. Han, W. Ke, and Y. Katada, 'Effect of Loading Factor on Environmental Fatigue Behavior of Low Alloy Pressure Vessel Steels in Simulated BWR Water,' Nucl. Eng. Des., 237, 1452 (2007)

상세보기
O.K. Chopra and W.J. Shack, 'Effect of LWR Coolant Environments on the Fatigue Life of Reactor Materials,' NUREG/CR-6909, Argonne National Laboratory (2006)
H.S. Mehta and S.R. Gosselin, 'Environmental Factor Approach to Account of Water Effects in Pressure Vessel and Piping Fatigue Evaluation,' Nucl. Eng. Des., 181, 175 (1998)

상세보기
F.A. Simonen, M.A. Khaleel, H.K. Phan, D.O. Harris, D.D. Dedhia, D.N. Kalinousky, and S.K. Shaukat, 'Evaluation of Environmental Effects on Fatigue Life of Piping,' Nucl. Eng. Des., 208, 143 (2001)

상세보기
T. Otsuka and T. Tanabe, 'Hydrogen Diffusion and Trapping Process around MnS Precipitates in Fe Examined by Tritium Autoradiography,' J. Alloy Compd., 425 (2007)
F.P. Ford and P.W. Emigh, 'The Prediction of the Maximum Corrosion Fatigue Crack Propagation Rate in the Low Alloy Steel Deoxygenated Water System at $288^{\circ}C$ ,' Corros. Sci., 25, 673 (1985)

상세보기
J.D. Atkinson, J. Yu and Z-Y. Chen, 'An Analysis of the Effects of Sulphur Content and Potential on Corrosion Fatigue Crack Growth in Reactor Pressure Vessel Steels,' Corros. Sci., 38, 755 (1996)

상세보기
L.A. James, 'Technical Basis for the Initiation and Cessation of Environmentally Assisted Cracking of Low Alloy Steels in Elevated Temperature PWR Environments,' Westinghouse Electric Company (1997)
J. D. Atkinson and J. E. Forrest, 'Factors Influencing the Rate of Growth of Fatigue Cracks in RPV Steels Exposed to a Simulated PWR Primary Water Environment,' Corros. Sci., 25, 607 (1985)

상세보기
D.A. Jones, Principles and Prevention of Corrosion, 3rd ed., p. 457, Prentice Hall Inc. (1995)
S.P. Lynch, 'Hydrogen Effects on Material Behavior and Corrosion Deformation Interactions,' Proc. Int. Conf. Hydrogen Effects on Material Behavior and Corrosion Deformation Interactions, Jackson Lake Lodge, Moran, Wyoming, USA, Sep. 22-26, 2002
S.G. Lee, C. Jang, and I.S. Kim, 'Effects of Hydrogen on the Fatigue Crack Growth Rate of Low Alloy Steels,' Proc. Int. Congress on Advanced Nuclear Power Plant (ICAPP'06), Reno, NV, USA, June 4-8, 2006
J.D. Atkinson, J. Yu, Z.Y. Chen and Z.J. Zhao, 'Modelling of Corrosion Fatigue Crack Growth Plateau for RPV Steels in High Temperature Water,' Nucl. Eng. Des., 184, 13 (1998). 232

상세보기

LOADING...

내보내기 구분	파일저장 인쇄 메일전송
구성항목	기본정보 상세정보 관리번호, 논문명, 저널/프로시딩명, 저자 , 발행년, 권, 호, 시작페이지, 끝페이지, 발행기관 관리번호, 논문명, 대등논문명, 저자 , 저널/프로시딩명, 발행기관, 발행년, 발행언어, 권, 호, 시작페이지, 끝페이지, ISBN, ISSN, 주제분야, 키워드, 초록(한글), 초록(영문), 저자(소속기관)
저장형식	Text(ASCII format) Excel format RefWorks Direct Export RIS format (for Reference Manager, ProCite, EndNote), Scholar's Aids, Mendeley
메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
안내	총 건의 자료가 검색되었습니다. 다운받으실 자료의 인덱스를 입력하세요. (1-10,000) 검색결과의 순서대로 최대 10,000건 까지 다운로드가 가능합니다. 데이타가 많을 경우 속도가 느려질 수 있습니다.(최대 2~3분 소요) 다운로드 파일은 UTF-8 형태로 저장됩니다. 파일의 내용이 제대로 보이지 않을실 때는 웹브라우저 상단의 보기 -> 인코딩 -> 자동선택 여부를 확인하십시오. ~ Text(ASCII format) Excel format

연합인증