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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 林招松(Chao-Sung Lin) | |
dc.contributor.author | Yi-Chen Tsai | en |
dc.contributor.author | 蔡易宸 | zh_TW |
dc.date.accessioned | 2021-06-16T03:06:35Z | - |
dc.date.available | 2025-08-06 | |
dc.date.copyright | 2020-08-25 | |
dc.date.issued | 2020 | |
dc.date.submitted | 2020-08-06 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/54594 | - |
dc.description.abstract | 鋼鐵材料因為優異機械性質與較低製造成本是最常用的金屬材料,熱軋延是將鋼錠輥軋成鋼板的唯一加工製程,在此嚴苛環境下(1050 ~ 1280 ºC持溫1~2小時均質化處理)會導致鋼板嚴重氧化,除了影響材料利用效率外,後續冷軋的氧化層去除也是製程重點。低碳鋼中的Si、Cr作為去氧化劑、抗腐蝕元素而刻意添加,Cu則固溶於基材作為後續奈米Cu析出所需,然而在高溫環境下液體Cu傾向於表面、晶界析出,熱軋過程中可能造成熱脆(Hot Shortness)問題。 本研究探討低碳鋼中Si、Cr和Cu對熱軋氧化層形成的影響,取六種Si、Cr、Cu含量不同的熱軋試片進行微結構分析後,對同樣六種試片做高溫氧化實驗。熱軋試片從再熱(1230 ºC持溫2小時)開始,緊接著為粗軋、精軋與盤捲步驟,取最後盤捲鋼板做OM、SEM、EDS、EBSD、EPMA等為結構分析;高溫氧化則取精軋前的溫度1150 ºC持溫1分鐘並爐冷降溫,升降溫過程皆保持於氬氣環境防止升降溫過程的氧化層生成。接著以OM、SEM、EDS、EBSD、EPMA、TEM等儀器探討氧化層微結構及高溫狀態下的析出機制。結果顯示,Si、Cr、Cu於界面處析出會降低氧化層厚度,Si、Cr與Fe0.95O形成的Fayalite、Chromite會增加氧化層於底材的附著性。含Cu量0.1 wt%的試片,Cu會在底材/氧化層界面處連續分佈,含Cu量0.3 wt%的試片則不止於界面處析出,在底材晶界也有以奈米Cu析出的現象。在同時含Si、Cr、Cu的試片中,Cu則作顆粒狀散亂分佈於Fayalite、Chromite所形成的次氧化層中,推測Si、Cr在高溫氧化中可以改善液體Cu所造成的熱脆現象。 | zh_TW |
dc.description.abstract | Carbon steel is the most commonly used material nowadays because of its superior mechanical properties and low cost. Hot rolling is the only way to process a billet steel to steel plate. Under harsh conditions, such as homogenization at 1050 ºC ~ 1280 ºC for 1 ~ 2 h, the steel plate tends to suffer severe oxidation, which not only reduces the utilization efficiency of material, but also impacts on the following deoxidizing process before cold rolling. For low carbon steel, Si and Cr are added as deoxidizing agent and anti-corrosion elements. Cu, on the other hand, is added for the subsequent precipitation of Cu nano particles. However, under high temperature conditions, liquid Cu tends to precipitate at the surface and grain boundaries, which may lead to hot shortness during the hot rolling process. This research studied the effect of Si, Cr and Cu on oxide scale formation during hot rolling. Six as-received hot rolling specimens with different concentrations of Si, Cr and Cu were employed through high temperature oxidation experiment. The hot rolling process begins with reheating process, which is held at 1230 ºC for 2 h, followed by rough rolling, finish rolling, and coiling. The final coiling steel plates were characterized using OM, SEM, EDS, EBSD, EPMA. The high temperature oxidation experiment is conducted at 1150 ºC for 1 min, followed by cooling to room temperature in furnace. The atmosphere of oxidation experiment is kept in Ar to prevent from forming scale during heating and cooling processes. The various steel samples after high temperature oxidation were characterized using OM, SEM/EDS, EBSD, EPMA, and TEM to gain better understanding on the scale microstructure and precipitation mechanism. Experimental results show that Si, Cr, Cu precipitating at the interface tend to reduce the scale thickness. Moreover, Si and Cr react with FeO to form Fayalite and Chromite structure, which strengthens the adhesion between the scale and the steel substrate. For the sample with 0.1 wt% Cu, Cu precipitates at the interface as a continuous layer. For the sample with 0.3 wt% Cu, Cu precipitates not only at the interface but also at the grain boundaries of steel as Cu nano particles. In the presence of Si, Cr and Cu, Cu particles form and disperses into the subscale composed of Fayalite and Chromite. It is thus inferred that during high temperature oxidation, Si and Cr ameliorate hot shortness caused by liquid Cu. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T03:06:35Z (GMT). No. of bitstreams: 1 U0001-0308202002082100.pdf: 72304327 bytes, checksum: 863e72efc7b91fdc0f5b35ba00494ca1 (MD5) Previous issue date: 2020 | en |
dc.description.tableofcontents | 口試委員會審定書 # 中文摘要 ii ABSTRACT iii 目錄 v 圖目錄 viii 表目錄 xii 第1章 前言 1 第2章 文獻回顧 3 2.1 熱軋產品 3 2.2 熱軋製程 4 2.3 高溫氧化之氧化層種類 5 2.3.1 Wüstite(Fe1-xO) 7 2.3.2 Magnetite(Fe3O4) 8 2.3.3 Hematite(Fe2O3) 9 2.4 氧化熱力學 10 2.5 氧化機制 12 2.5.1 n-type氧化層 13 2.5.2 p-type氧化層 15 2.5.3 合金元素對缺陷產生機制的影響 16 2.6 氧化動力學 16 2.6.1 直線規律 17 2.6.2 拋物線規律 18 2.6.3 對數規律 19 2.7 合金元素 19 2.8 溫度、時間、氧化氣氛 26 2.8.1 溫度 26 2.8.2 時間 27 2.8.3 氧化氣氛 29 2.9 幾何因素 30 第3章 實驗方法 33 3.1 熱軋試片分析 34 3.2 高溫氧化實驗 34 3.3 橫截面試片製備 35 3.4 高溫氧化實驗困難 36 3.5 微結構觀察與實驗分析 39 3.5.1 光學顯微鏡 39 3.5.2 掃描式電子顯微鏡 39 3.5.3 聚焦離子束與電子束顯微系統 39 3.5.4 穿透式電子顯微鏡 40 3.5.5 電子微探儀 40 第4章 結果與討論 41 4.1 熱軋試片分析 41 4.1.1 OM、SEM橫截面觀測 41 4.1.2 EBSD氧化層相鑑定 45 4.1.3 EPMA氧化層元素分佈分析 53 4.2 高溫氧化試片分析 56 4.2.1 OM、SEM橫截面觀測 56 4.2.2 EBSD氧化層相鑑定 62 4.2.3 TEM觀測、繞射圖形相鑑定 70 4.2.4 EPMA表面元素分佈分析 81 4.3 析出機制 83 第5章 結論 88 第6章 未來展望 89 參考文獻 90 | |
dc.language.iso | zh-TW | |
dc.title | 合金元素矽鉻銅對低碳鋼高溫氧化的影響 | zh_TW |
dc.title | The Effect of Alloying Elements Si, Cr, Cu on High Temperature Oxidation of Low Carbon Steel | en |
dc.type | Thesis | |
dc.date.schoolyear | 108-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 蔡文達,汪俊延,葛明德,林景崎 | |
dc.subject.keyword | 高溫氧化,合金元素,低碳鋼,熱脆,附著性, | zh_TW |
dc.subject.keyword | high temperature oxidation,alloying elements,low carbon steel,hot shortness,adhesion, | en |
dc.relation.page | 93 | |
dc.identifier.doi | 10.6342/NTU202002245 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2020-08-06 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 材料科學與工程學研究所 | zh_TW |
顯示於系所單位: | 材料科學與工程學系 |
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