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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/94703完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 薛人愷 | zh_TW |
| dc.contributor.advisor | Ren-Kae Shiue | en |
| dc.contributor.author | 陳泰丞 | zh_TW |
| dc.contributor.author | Tai-Cheng Chen | en |
| dc.date.accessioned | 2024-08-16T17:37:07Z | - |
| dc.date.available | 2024-08-17 | - |
| dc.date.copyright | 2024-08-16 | - |
| dc.date.issued | 2024 | - |
| dc.date.submitted | 2024-08-09 | - |
| dc.identifier.citation | References
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Migné, Behavior of duplex stainless steel casting defects under mechanical loadings, Nuclear Engineering and Design 197(1) (2000) 141-153. [52] P. Haušild, C. Berdin, P. Bompard, N. Verdière, Ductile fracture of duplex stainless steel with casting defects, International Journal of Pressure Vessels and Piping 78(9) (2001) 607-616. | - |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/94703 | - |
| dc.description.abstract | 本研究探討CF8A鑄造沃斯田鐵系不銹鋼，在高溫水環境下的應力腐蝕龜裂敏感性。研究中針對δ-肥粒鐵的含量、熱時效的時間以及軋延的程度對CF8A不銹鋼應力腐蝕龜裂敏感性影響，進行了詳細且全面的研究，並提出了應力腐蝕龜裂的機制。研究的結果表示，熱時效對CF8A不銹鋼的顯微組織影響較小，而軋延則會導致滑移線和αʹ-麻田散鐵在沃斯田鐵基體中形成。熱時效會增加δ-肥粒鐵的硬度，但對沃斯田鐵硬度的影響則較小。軋延會使δ-肥粒鐵和沃斯田鐵的硬度提升，且隨著軋延程度的增加，δ-肥粒鐵和沃斯田鐵的硬度也會隨之提升。材料的δ-肥粒鐵含量、熱時效時間及軋延程度的增加，均會顯著提高材料的最大抗拉強度，並降低材料的延展性。此外，越長的熱時效時間及越大的軋延程度，均會導致CF8A不銹鋼有更高的應力腐蝕龜裂敏感性。值得注意的是，高δ-肥粒鐵含量試樣的應力腐蝕龜裂敏感性較容易受熱時效影響，而低δ-肥粒鐵含量試樣的應力腐蝕龜裂敏感性則較容易受軋延影響。對於經過熱時效和軋延的低δ-肥粒鐵含量試樣，裂紋傾向沿滑移線擴展，從而使穿晶應力腐蝕成為主要的應力腐蝕龜裂機制；而對於經過熱時效和軋延的高δ-肥粒鐵含量試樣，裂紋則傾向沿δ-肥粒鐵與沃斯田鐵之間的相介面擴展，表示相介面的破裂為主要的應力腐蝕龜裂機制。 | zh_TW |
| dc.description.abstract | This study evaluated the stress corrosion cracking (SCC) susceptibility of CF8A cast austenitic stainless steels (CASS) in a high-temperature water environment. The combined effects of δ-ferrite content, thermal aging duration, and rolling degree on the SCC susceptibility of CF8A stainless steels were thoroughly examined, and the corresponding SCC mechanisms were proposed. The results showed that thermal aging has minimal impact on the microstructure of CF8A stainless steels, while rolling promotes the formation of slip lines and αʹ-martensite within the austenite matrix. Prolonged thermal aging increases the hardness of δ-ferrite but has little effect on the hardness of austenite. Rolling hardens both δ-ferrite and austenite, with hardness increasing as the degree of rolling increases. Increases in δ-ferrite content, thermal aging time, and rolling degree all lead to a significant rise in ultimate tensile strength (UTS) and a reduction in elongation of CF8A stainless steels. Additionally, longer thermal aging times and greater rolling degrees contribute to higher SCC susceptibility. Notably, the SCC susceptibility of specimens with higher δ-ferrite content is more affected by thermal aging, while those with lower δ-ferrite content are more influenced by rolling. For thermally-aged + rolled specimens with lower δ-ferrite content, cracks are more likely to propagate along slip lines, making transgranular stress corrosion cracking (TGSCC) the dominant SCC mechanism. For thermally-aged + rolled specimens with higher δ-ferrite content, cracks tend to propagate along the δ-ferrite/austenite interface, indicating that interface cracking is the predominant SCC mechanism. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2024-08-16T17:37:07Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2024-08-16T17:37:07Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | Table of Contents
口試委員會審定書 i 學位論文學術倫理暨原創性聲明書 ii Acknowledgement iii 摘要 iv Abstract v Table of Contents vi List of Figures viii List of Tables xiii List of Abbreviations xiv Chapter 1 Introduction 1 Chapter 2 Literature Review 3 2-1 Introduction to cast austenitic stainless steels 3 2-2 Mechanism of thermal aging embrittlement 8 2-2-1 Spinodal decomposition 8 2-2-2 Precipitation of G-phase 19 2-2-3 Other microstructural evolutions 27 2-3 Effect of thermal aging on the mechanical properties 28 2-4 Effect of thermal aging on the corrosion behaviors 34 Chapter 3 Experimental Approach 37 3-1 Materials 37 3-2 Preparation of metallographic specimens 46 3-3 Mechanical tests 48 3-4 SCC tests 54 3-5 Microstructural analysis 59 3-6 Nomenclature 63 Chapter 4 Results 65 4-1 Microstructure 65 4-1-1 Solution annealed and thermally-aged specimens 65 4-1-2 Thermally-aged + rolled specimens 67 4-2 Hardness 71 4-2-1 Solution annealed and thermally-aged specimens 71 4-2-2 Thermally-aged + rolled specimens 75 4-3 Fatigue properties 78 4-4 Tensile properties in high temperature air 80 4-4-1 Solution annealed and thermally-aged specimens 80 4-4-2 Thermally-aged + rolled specimens 84 4-5 Tensile properties in high temperature water (SCC test) 89 4-5-1 Solution annealed and thermally-aged specimens 89 4-5-2 Thermally-aged + rolled specimens 93 4-5-3 The effect of high temperature water on UTS 98 4-5-4 The effect of high temperature water on elongation 102 4-6 Fracture surface analysis 106 4-6-1 Macroscopic analysis 106 4-6-2 Microscopic analysis 116 4-7 Cross-sectional analysis 119 4-7-1 Phase analysis 119 4-7-2 Plastic strain analysis 122 Chapter 5 Discussion 125 Chapter 6 Conclusions 131 Chapter 7 Future Work 133 References 135 Author’s Biography 141 List of Publication 142 | - |
| dc.language.iso | en | - |
| dc.subject | CF8A | zh_TW |
| dc.subject | 鑄造沃斯田鐵系不銹鋼 | zh_TW |
| dc.subject | 熱時效 | zh_TW |
| dc.subject | 軋延 | zh_TW |
| dc.subject | 應力腐蝕龜裂 | zh_TW |
| dc.subject | δ-肥粒鐵 | zh_TW |
| dc.subject | thermal aging | en |
| dc.subject | CF8A | en |
| dc.subject | δ-ferrite | en |
| dc.subject | stress corrosion cracking | en |
| dc.subject | rolling | en |
| dc.subject | cast austenitic stainless steel | en |
| dc.title | 熱時效鑄造沃斯田鐵系不銹鋼於模擬核能電廠冷卻水環境中之應力腐蝕龜裂敏感性研究 | zh_TW |
| dc.title | Study on the Stress Corrosion Cracking Susceptibility of Thermally-Aged Cast Austenitic Stainless Steels in Simulated Cooling Water Environments of Nuclear Power Plants | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 112-2 | - |
| dc.description.degree | 博士 | - |
| dc.contributor.oralexamcommittee | 郭東昊;蔡履文;葉宗洸;陳文祥 | zh_TW |
| dc.contributor.oralexamcommittee | Dong-Hau Kuo;Leu-Wen Tsay;Tsung-Kuang Yeh;Wen-Shiang Chen | en |
| dc.subject.keyword | CF8A,鑄造沃斯田鐵系不銹鋼,熱時效,軋延,應力腐蝕龜裂,δ-肥粒鐵, | zh_TW |
| dc.subject.keyword | CF8A,cast austenitic stainless steel,thermal aging,rolling,stress corrosion cracking,δ-ferrite, | en |
| dc.relation.page | 154 | - |
| dc.identifier.doi | 10.6342/NTU202404169 | - |
| dc.rights.note | 未授權 | - |
| dc.date.accepted | 2024-08-12 | - |
| dc.contributor.author-college | 工學院 | - |
| dc.contributor.author-dept | 材料科學與工程學系 | - |
| 顯示於系所單位： | 材料科學與工程學系 | |
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