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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 楊哲人 | |
| dc.contributor.author | Yi-Liang Tsai | en |
| dc.contributor.author | 蔡宜良 | zh_TW |
| dc.date.accessioned | 2021-06-13T01:35:56Z | - |
| dc.date.available | 2011-08-05 | |
| dc.date.copyright | 2011-08-05 | |
| dc.date.issued | 2011 | |
| dc.date.submitted | 2011-08-02 | |
| dc.identifier.citation | 1. Davenport, E.S. and E.C. Bain, Transformation of austenite at constant subcritical temperatures. Transactions of the American Institute of Mining and Metallurgical Engineers, 1930. 90: p. 117-154.
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Bowles, THE CRYSTALLOGRAPHY OF THE PRECIPITATION OF ALPHA-RODS FROM BETA-CU-ZN ALLOYS. Acta Metallurgica, 1980. 28(11): p. 1495-1504. 34. Takahashi, M. and H. Bhadeshia, MODEL FOR TRANSITION FROM UPPER TO LOWER BAINITE. Materials Science and Technology, 1990. 6(7): p. 592-603. 35. Kalish, D. and M. Cohen, STRUCTURAL CHANGES AND STRENGTHENING IN STRAIN TEMPERING OF MARTENSITE. Materials Science and Engineering, 1970. 6(3): p. 156-&. 36. Lin, W.T. (2008), Investigation on microstructure of superbainite (Unpublished master's thesis). National Taiwan University, Taipei. 37. Garcia-Mateo, C., F.G. Caballero, and H. Bhadeshia, Development of hard bainite. Isij International, 2003. 43(8): p. 1238-1243. 38. Garcia-Mateo, C., F.G. Caballero, and H. Bhadeshia, Acceleration of low-temperature bainite. Isij International, 2003. 43(11): p. 1821-1825. 39. Huang, H.T. (2009). Effect of prior austenite grain size on the transformation of superbainite (Unpublished master's thesis). 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Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science, 2006. 37A(1): p. 109-124. 46. Furuhara, T., et al., Variant selection in grain boundary nucleation of upper bainite. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science, 2008. 39A(5): p. 1003-1013. 47. Furuhara, T., et al., Crystallography of upper bainite in Fe-Ni-C alloys. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing, 2006. 431(1-2): p. 228-236. 48. Garcia-Mateo, C. and F.G. Caballero, The role of retained austenite on tensile properties of steels with bainitic microstructures. Materials Transactions, 2005. 46(8): p. 1839-1846. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/30096 | - |
| dc.description.abstract | 傳統的上變韌鐵在次平板間會產生硬脆的雪明碳鐵，在鋼鐵中添加約2 wt%的矽(Si)，並在過冷度大之環境下可以生成無碳化物析出之變韌鐵。此種組織主要由變韌鐵與富含碳的殘留沃斯田鐵所組成，並藉由大量的差排強化，因此具有良好的韌性與強度，稱為超級變韌鐵。在剪切相變態的機制中，由於周遭沃斯田鐵的塑性變形調適，形成的超級變韌鐵尺度約為40奈米。這種微小尺度的組織結構，造成了高強度的機械性質。殘留沃斯田鐵因具有高的碳濃度及高密度的差排造成的機械穩定，可被保留至室溫，帶給材料良好的韌性。但對商品化而言，先前研究指出長達5天甚至更多的熱處理時間，是為其缺點。本研究著重在鋁元素及矽元素對超級變韌鐵相變態速率的影響。矽元素會造成固溶強化，使得基地組織強度增高，本研究減少矽元素含量，檢視鋼材硬度結果達到穩定硬度的時間明顯的縮短，但也損失約7%左右的硬度。鋁元素亦會造成固溶強化，對超級變韌鐵相變態初期造成負面影響，但其固溶強化程度並無矽元素來得高。添加鋁元素增加超級變韌鐵相變態反應自由能差所帶來的另一效應，在超級變韌鐵束狀組織增多後能以更快的速率進行相變態。本研究三個成份試片皆在3天至5天後達到飽和狀態，但添加2 wt%鋁元素，在最終穩定狀態使得超級變韌鐵體積分率上升4個百分比。 | zh_TW |
| dc.description.provenance | Made available in DSpace on 2021-06-13T01:35:56Z (GMT). No. of bitstreams: 1 ntu-100-R98527003-1.pdf: 37795716 bytes, checksum: 824e4d9cc4e85ece17c871b1e8a36b93 (MD5) Previous issue date: 2011 | en |
| dc.description.tableofcontents | 目錄
誌謝 ii 摘要 iv Abstract v 第一章 前言 1 第二章 文獻回顧 2 2.1 沃斯田鐵之分解相變化 2 2.1.1 擴散相變 6 2.1.2 非擴散型相變態 7 2.2變韌鐵相變態 15 2.2.1 變態鐵的成核 15 2.2.2 變韌鐵的成長 17 2.2.3 變韌鐵的晶體結構 20 2.2.4 變韌鐵的顯微組織 20 2.3 超級變韌鐵 26 2.3.1 超級變韌鐵的成長機制 26 2.3.2 超級變韌鐵的顯微組織 27 第三章 研究方法 30 3.1實驗方法 30 3.2實驗材料 30 3.3實驗步驟與使用儀器 34 3.3.1光學顯微鏡 34 3.3.2掃描式電子顯微鏡 35 3.3.3穿透式電子顯微鏡 35 3.3.4 X光繞射儀 35 3.3.5 HV微硬度測量 36 第四章 結果與討論 37 4.1含鋁超級變韌鐵巨觀組織觀察和機械性質 37 4.1.1恆溫熱處理後之金相組織觀察 37 4.1.2恆溫熱處理後之鋼材硬度比較 48 4.1.3降低矽含量對超級變韌鐵組織發展影響 54 4.2 TEM顯微結構分析與奈米結構演化 56 4.2.1超級變韌鐵相變態初期 56 4.2.2超級變韌鐵相變態中期 64 4.2.3超級變韌鐵相變態後期 78 4.3含鋁超級變韌鐵相變態後之沃斯田鐵穩定性 83 4.3.1超級變韌鐵相變態穩定後XRD相組成定量分析 85 4.3.2超級變韌鐵相變態中後期DSC測量Ms溫度比較 89 第五章 結論 93 參考文獻 94 | |
| dc.language.iso | zh-TW | |
| dc.title | 添加鋁元素對超級變韌鐵之組織發展影響研究 | zh_TW |
| dc.title | The Microstructure Development of Al-containing Superbainite Steels | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 99-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 王星豪,林新智,侯春看,黃慶淵 | |
| dc.subject.keyword | 穿透式電子顯微鏡,相變態,變韌鐵,鋁,矽, | zh_TW |
| dc.subject.keyword | Transmission Electron Microscopy(TEM),displacive phase transformation,bainite,aluminum,silicon, | en |
| dc.relation.page | 97 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2011-08-02 | |
| 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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