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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 楊哲人 | |
| dc.contributor.author | San-Ho Chen | en |
| dc.contributor.author | 陳申賀 | zh_TW |
| dc.date.accessioned | 2021-06-13T02:22:26Z | - |
| dc.date.available | 2014-08-05 | |
| dc.date.copyright | 2011-08-05 | |
| dc.date.issued | 2011 | |
| dc.date.submitted | 2011-08-01 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/30951 | - |
| dc.description.abstract | 為了提升銲接效益、減少能源消耗並節省施工成本，新一代460 MPa等級之大入熱量銲接鋼板取代了傳統以肥粒鐵–波來鐵為主的鋼板結構，並廣泛地應用在造船業以及建築業上。新開發的鋼板添加微量之Ti, Nb, B等元素，經大入熱量銲接後，粗晶熱影響區僅有數個沃斯田鐵晶粒的寬度；其主要結構為包覆著先前沃斯田鐵晶界的高溫肥粒鐵與佈滿晶粒內部之粗大針狀肥粒鐵為主。這種複合的顯微結構大幅地改善了熱影響區的韌性，使大入熱量銲接實際地應用在厚鋼板的接合。事實上，傳統的研究認為要改善熱影響區的韌性必須透過細化顯微結構來達成；然而，經大入熱量銲接後，熱影響區形成粗大的針狀肥粒鐵組織亦能夠提供所需的機械性質。
本研究目的在於探究經大入熱量銲接後粗大的針狀肥粒鐵形成機制，輔以動態熱膨脹儀設計焊接熱模擬以及恆溫熱處理製程，控制(1)先前沃斯田鐵晶粒尺寸、(2)相變態溫度、(3)相變態時間與(4)析出物成核位置，各製程所得到之顯微結構與奈米級的碳氮複合型析出物將利用穿透式電子顯微鏡觀察，並討論沃斯田鐵晶粒尺寸與高溫肥粒鐵的生成與否對於針狀肥粒鐵相變態之影響。其次，透過掃描式電子顯微鏡配以電子背向散射繞射技術可得到顯微結構與晶體學方位關係。上述實驗結果將與真實銲接後的粗晶熱影響區結構作比較討論，透過探討針狀肥粒鐵相變態之機制來控制焊接後粗晶熱影響區之顯微結構，將有助於工業上更高品級之大入熱量焊接鋼板的開發。 | zh_TW |
| dc.description.abstract | To improve the welding efficiency and to reduce economic cost, the advanced steel plates for the high-heat-input welding have been developed from the conventional ferrite–pearlite steel plates with a yield strength of about 460
MPa for shipbuilding and construction industries. The newly developed steel plates, after high-heat-input welding, have a novel microstructure in HAZ, where great amounts of coarse acicular ferrite are enveloped by the networks of allotrimorphic ferrite forming around the prior austenite boundaries. Such a novel microstructure improves the toughness in HAZ and enables the high heat input welding to be a pratical application for join steel thick plates. In fact, different from the conventional idea that the refinement of microstructure could improve the toughness in HAZ, the coarse acicular ferrite formed in HAZ during the high-heat-input welding in the present steel plates also provides required mechanical properties. The present study attempts to explore the mechanism to form coarse acicular ferrite in steels during the high-heat-input welding. The transformation of coarse acicular ferrite was studied via the simulated heat treatments using a dilatometer to control several parameters: prior austenite grain size, transformation temperature, transformation interval, and nucleation sites. The corresponding microstructure of acicular ferrite and the nanoscaled carbonitrides (as the nucleation sites for acicular ferrite) were investigated using transmission electron microscopy (TEM). More attention has been paid to the morphology of acicular ferrite. The effect of the grain size of prior austenite on acicular ferrite transformation has also been studied. Moreover, the macrostructure and the corresponding crystallography were analyzed by electron back scattering pattern (EBSD) using scanning electron microscopy (SEM). The results have been compared with the microstructure in the real HAZ of weld plates. It is believed that understanding the transformation of coarse acicular ferrite facilitates the development of higher grades of steel plates for the high-heat-input welding. | en |
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| dc.description.tableofcontents | 口試委員會審定書· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · i
致謝· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ii 中文摘要· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · iv 英文摘要· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · v 圖目錄· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · xii 表目錄· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · xiii 第一章研究目的· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 1 第二章文獻回顧· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 2 2.1 沃斯田鐵–肥粒鐵相變態過程. . . . . . . . . . . . . . . . . . . . . . 2 2.2 經大入熱量銲接後鋼板熱影響區之顯微結構. . . . . . . . . . . . . . 5 2.2.1 針狀肥粒鐵(acicular ferrite) . . . . . . . . . . . . . . . . . . . 5 2.2.2 上變韌鐵(upper bainite) 與下變韌鐵(lower bainite) . . . . . . 5 2.2.3 晶粒內肥粒鐵(intragranular ferrite) . . . . . . . . . . . . . . . 8 2.2.4 控制顯微結構以改善銲接熱影響區韌性的方法. . . . . . . . 11 2.3 大入熱量銲接鋼板之微合金元素的固溶與析出. . . . . . . . . . . . . 17 2.4 電氣立銲(Electrogas Arc Welding, EGW) . . . . . . . . . . . . . . . . 18 2.5 大入熱量銲接鋼板之研究現況. . . . . . . . . . . . . . . . . . . . . . 20 第三章實驗設計與方法· · · · · · · · · · · · · · · · · · · · · · · · · · · 22 3.1 實驗材料及流程. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.1.1 實驗材料. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.1.2 實驗流程. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.2 實驗儀器. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3.2.1 光學顯微鏡的觀察步驟. . . . . . . . . . . . . . . . . . . . . . 25 3.2.2 場發射掃描式電子顯微鏡(FEG-SEM) 及電子背向散射繞射 技術(EBSD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3.2.3 TEM 試片製作及觀察步驟. . . . . . . . . . . . . . . . . . . . 26 第四章實驗結果與討論· · · · · · · · · · · · · · · · · · · · · · · · · · · 27 4.1 鋼板經大入熱量銲接後金相及顯微結構之觀察. . . . . . . . . . . . . 27 4.2 控制先前沃斯田鐵晶粒尺寸以觀察針狀肥利鐵相變態結果. . . . . . 34 4.3 高溫肥粒鐵對晶粒內肥粒鐵相變態之影響. . . . . . . . . . . . . . . 46 4.4 各階段恆溫熱處理製程後晶粒內肥粒鐵之綜合比較. . . . . . . . . . 52 4.4.1 寬長比(aspect ratio) . . . . . . . . . . . . . . . . . . . . . . . . 52 4.4.2 利用菊池線量測晶粒間方位關係. . . . . . . . . . . . . . . . 58 4.4.3 電子背向散射繞射分析(EBSD) . . . . . . . . . . . . . . . . . 71 4.5 熱影響區粗晶區析出物對晶粒內肥粒鐵相變態之影響. . . . . . . . . 82 第五章結論· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 100 參考文獻· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 102 | |
| dc.language.iso | zh-TW | |
| dc.subject | 穿透式電子顯微鏡 | zh_TW |
| dc.subject | 電子背向散射繞射分析 | zh_TW |
| dc.subject | 大入熱量銲接 | zh_TW |
| dc.subject | 針狀肥粒鐵 | zh_TW |
| dc.subject | 粗晶熱影響區 | zh_TW |
| dc.subject | Acicular Ferrite | en |
| dc.subject | Steel Plate | en |
| dc.subject | EBSD | en |
| dc.subject | TEM | en |
| dc.subject | High-heat-input Weld | en |
| dc.title | 含鈦之大入熱量銲接鋼板粗晶熱影響區顯微結構分析暨針狀肥粒鐵相變機制之研究 | zh_TW |
| dc.title | A study on Characterizations on Microstructure of Coarse Grain HAZ and Phase Transformation Mechanism of Acicular Ferrite in High Heat Input Steel Plates | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 99-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 林新智,侯春看,王星豪,黃慶淵 | |
| dc.subject.keyword | 大入熱量銲接,粗晶熱影響區,針狀肥粒鐵,穿透式電子顯微鏡,電子背向散射繞射分析, | zh_TW |
| dc.subject.keyword | High-heat-input Weld,Acicular Ferrite,TEM,EBSD,Steel Plate, | en |
| dc.relation.page | 110 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2011-08-01 | |
| 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 | |
文件中的檔案：
| 檔案 | 大小 | 格式 | |
|---|---|---|---|
| ntu-100-1.pdf 未授權公開取用 | 137.86 MB | Adobe PDF |
系統中的文件，除了特別指名其著作權條款之外，均受到著作權保護，並且保留所有的權利。