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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/24242完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 潘永寧(Yung-Nin,Pan) | |
| dc.contributor.author | Shih-En Su | en |
| dc.contributor.author | 蘇士恩 | zh_TW |
| dc.date.accessioned | 2021-06-08T05:19:28Z | - |
| dc.date.copyright | 2011-08-10 | |
| dc.date.issued | 2011 | |
| dc.date.submitted | 2011-07-29 | |
| dc.identifier.citation | [1] 黃振賢, '機械材料,'新文京開發出版社,台北, Chap 5, pp. 234-246, 1990.
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/24242 | - |
| dc.description.abstract | 本研究主要是針對304不銹鋼鑄件之各種不同缺陷，如：晶界碳化鉻(Cr23C6)析出、鑄造縮孔缺陷、焊接破裂等，進行分析，並提出解決方法與對策。此外，本研究亦針對304不銹鋼鑄件，建立適當之酸洗與鈍化處理條件來去除不銹鋼表面之鐵份或含鐵汙染物，以形成保護性鈍化膜來提升其抗蝕性。最後，本研究亦以次氯酸鈉水溶液作為腐蝕液，建立腐蝕檢測之標準，以作為鑄件品質管制之方法。
針對晶界碳化鉻Cr23C6析出問題，採用固溶處理(1080oC - 2hr)及水淬，將晶界上所析出之Cr23C6碳化物完全分解，以解決粒間腐蝕之問題。至於鑄件縮孔缺陷問題，研究上採用solidcast電腦軟體進行凝固模擬，以預測縮孔可能發生之位置，並進行最佳冒口設計，以解決縮孔問題。另外，本研究探討以酸洗與鈍化處理來嘗試彌補鑄件表面缺陷可能產生之腐蝕問題，實驗結果顯示，雖可完全通過ferroxyl測試，但仍舊無法通過鹽霧試驗之測試標準。最後，本研究建立了5% NaOCl-50 oC-24hr之加速腐蝕測試方法，測試結果顯示試片之腐蝕程度與原試片之品質有密切的關係，腐蝕結果易於判別，且測試時間可縮短至24hr以內，可作為鑄件品質管制之方法。 | zh_TW |
| dc.description.abstract | The purposes of this research are three fold：(1)To analyze the casting defects, including Cr23C6 carbides precipitation at grain boundaries, shrinkage porosities, welding cracks, etc, and to propose corrective measures; (2)To obtain appropriate pickling and passivation treatment conditions to remove surface defects and hence increase the corrosion resistance ability; (3)To establish a standard corrosion resistance test method by using sodium hypochlorite(NaOCl) as corrosive etchant to serve as quality control scheme.
Regarding the precipitation of Cr23C6 carbides at austenite grain boundaries, solution treatment (1080oC/2hr) followed by water quench was performed. As a result, the Cr23C6 precipitants can be eliminated almost completely. In addition, solidification simulation by employing solidcast software was conducted to predict the locations of possible shrinkage porosities formation. And then, riser design was performed to solve the shrinkage defect. Furthermore, this study investigated the effects of pickling and passivation treatments on corrosion resistance of defective castings. The results show that the treated castings can pass the ferroxyl tests, but fail to pass the salt-spray tests. Finally, this study also developed a hasty corrosion resistance testing method, namely, 5% NaOCl-50 oC-24hr, which has demonstrated a very good correlation between casting quality and degree of corrosion, and can serve as an effective method for quality control. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-08T05:19:28Z (GMT). No. of bitstreams: 1 ntu-100-R96522710-1.pdf: 9801990 bytes, checksum: 408233bb9fad89e42a88f28aaa8cd380 (MD5) Previous issue date: 2011 | en |
| dc.description.tableofcontents | 中文摘要 I
ABSTRACT II 目錄 III 圖目錄 VI 表目錄 X 第一章 緒論 1 1.1 研究動機與背景 1 1.2 文獻回顧 1 1.2.1 不銹鋼之耐腐蝕原理 1 1.2.2 不銹鋼之分類與規格 2 1.2.3 不銹鋼之腐蝕現象 6 1.2.4 凝固收縮基理與冒口設計方法 12 1.3 研究方法與內容概要 14 第二章 不銹鋼腐蝕問題分析與對策 24 2.1 碳化鉻Cr23C6析出現象 24 2.1.1 前言 24 2.1.2 啤酒桶蓋子之規格及化學成份分析 24 2.1.3 外觀檢查及顯微組織分析(OM&SEM) 24 2.1.4 解決對策 25 2.2 縮孔(Shrinkage porosity)缺陷 26 2.2.1 前言 26 2.2.2 顯微組織觀察與金相分析(OM) 26 2.2.3 解決方法與對策 27 2.2.4 運用電腦軟體solidcast對冒口設計進行凝固模擬 28 2.3 焊接破裂(Welding cracks)問題 29 2.3.1 前言 29 2.3.2 顯微組織觀察與金相分析(OM) 29 2.3.3 預防方法與對策 31 第三章 次氯酸鈉水溶液之耐腐蝕試驗及檢測方法之建立 57 3.1 A公司試片 57 3.1.1 實驗試片 57 3.1.2 實驗方法 57 3.1.3 實驗結果與分析 58 3.2 B公司試片 59 3.2.1 測試試片 59 3.2.2 耐腐蝕試驗 59 3.2.3 實驗結果與分析 60 3.3 表面品質之影響 60 3.3.1 實驗試片(公司B) 60 3.3.2 耐腐蝕試驗 61 3.3.3 實驗結果與分析 61 3.4 次氯酸鈉水溶液濃度之影響 61 3.5 加速腐蝕試驗 62 3.5.1 實驗試片 62 3.5.2 耐腐蝕試驗 62 3.5.3 實驗結果與分析 62 3.6 小結 62 第四章 酸洗及鈍化處理對不銹鋼耐蝕性之影響 77 4.1 前言 77 4.2 實驗方法 77 4.2.1 ferroxyl測試 77 4.2.2 酸洗處理(Pickling treatment) 78 4.2.3 鈍化處理(Passivation treatment) 78 4.2.4 鹽霧試驗(Salt spray test) 79 4.3 實驗結果 79 4.3.1 鑄件編號1 79 4.3.2 鑄件編號2 79 4.3.3 鑄件編號3 80 4.3.4 鑄件編號4 80 4.3.5 鑄件編號5 80 4.3.6 鑄件編號6 81 4.3.7 鹽霧試驗 81 4.4 小結 81 第五章 結論 89 參考文獻 91 | |
| dc.language.iso | zh-TW | |
| dc.title | 304不銹鋼鑄件之缺陷分析及對策 | zh_TW |
| dc.title | Defects analysis and countermeasures of 304 stainless steel castings | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 99-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 楊榮顯,許正勳 | |
| dc.subject.keyword | 304不銹鋼,碳化鉻,縮孔,次氯酸鈉水溶液,酸洗與鈍化, | zh_TW |
| dc.subject.keyword | 304 stainless steel,Cr23C6 carbides,shrinkage porosity,sodium hypochlorite solution,picking,passivation treatment, | en |
| dc.relation.page | 94 | |
| dc.rights.note | 未授權 | |
| dc.date.accepted | 2011-07-29 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 機械工程學研究所 | zh_TW |
| 顯示於系所單位： | 機械工程學系 | |
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