Low cycle fatigue behaviors of low alloy steels in $310^\circ C$ deoxygenated water = 산소가 제거된 $310^\circ C$ 수화학환경에서 저합금강의 저주기 피로거동

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dc.contributor.advisorJang, Chang-heui-
dc.contributor.advisor장창희-
dc.contributor.authorJang, Hun-
dc.contributor.author장훈-
dc.date.accessioned2011-12-14T08:18:02Z-
dc.date.available2011-12-14T08:18:02Z-
dc.date.issued2008-
dc.identifier.urihttp://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=296273&flag=dissertation-
dc.identifier.urihttp://hdl.handle.net/10203/49543-
dc.description학위논문(석사) - 한국과학기술원 : 원자력및양자공학과, 2008.2, [ xi, 63 p. ]-
dc.description.abstractAfter low cycle fatigue tests of SA508 Gr.1a low alloy steel in 310\degC deoxygenated water, the fatigue surface and the sectioned area of specimens were observed to understand the effect of the cyclic strain rate on the environmentally assisted cracking behaviors. From the fatigue crack morphologies of the specimen tested at a strain rate of 0.008 %/s, unclear ductile striations and blunt crack tip were observed. So, metal dissolution could be the main cracking mechanism of the material at the strain rate. On the other hand, on the fatigue surface of the specimen tested at strain rates of 0.04 and 0.4 %/s, the brittle cracks and the flat facets, which are the evidence of the hydrogen induced cracking, were observed. Also, the tendency of linkage between the main crack and micro-cracks was observed on the sectioned area. Therefore, the main cracking mechanism at the strain rates of 0.04 and 0.4 %/s could be the hydrogen induced cracking. Additionally, the evidence of the dissolved MnS inclusions was observed on the fatigue surface from energy dispersive x-ray spectrometer analyses. So, despite of 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 310\degC deoxygenated water. Additionally, our experimental fatigue life data of SA508 Gr.1a low alloy steel (heat A) showed a consistent difference with statistical model produced in argon national laboratory. So, additional low cycle fatigue tests of other heat SA508 Gr.1a (heat B) and SA508 Gr.3 low alloy steels were performed to investigate the effect of material variability on fatigue behaviors of low alloy steels in 310\degC deoxygenated water. In results, the fatigue lives of three low alloy steels were increased following order; SA508 Gr.1a low alloy steel - heat A, SA508 Gr.3 low alloy steel, and SA508 Gr.1a low alloy steel - heat B. From microstructure observation, the fatigue surface of SA508 Gr.1a low alloy ...eng
dc.languageeng-
dc.publisher한국과학기술원-
dc.subjectLow cycle fatigue-
dc.subjectEnvironmentally assisted cracking-
dc.subjectmaterial variability-
dc.subjectlow alloy steel-
dc.subjectMnS inclusion-
dc.subject저주기 피로-
dc.subject환경조장균열-
dc.subject재료의 다양성-
dc.subject저합금강-
dc.subjectMnS 게재물-
dc.titleLow cycle fatigue behaviors of low alloy steels in $310^\circ C$ deoxygenated water = 산소가 제거된 $310^\circ C$ 수화학환경에서 저합금강의 저주기 피로거동-
dc.typeThesis(Master)-
dc.identifier.CNRN296273/325007 -
dc.description.department한국과학기술원 : 원자력및양자공학과, -
dc.identifier.uid020063499-
dc.contributor.localauthorJang, Hun-
dc.contributor.localauthor장훈-
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NE-Theses_Master(석사논문)
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