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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 楊哲人 | |
dc.contributor.author | Han-Ting Huang | en |
dc.contributor.author | 黃瀚霆 | zh_TW |
dc.date.accessioned | 2021-06-15T01:38:47Z | - |
dc.date.available | 2014-07-24 | |
dc.date.copyright | 2009-07-24 | |
dc.date.issued | 2009 | |
dc.date.submitted | 2009-07-15 | |
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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Edmonds, Bainite Transformation in a Silicon Steel. Metallurgical Transactions a-Physical Metallurgy and Materials Science, 1979. 10(7): p. 895-907. 15. Bhadeshia, H.K.D.H. and D.V. Edmonds, Bainite in Silicon Steels - New Composition Property Approach .1. Metal Science, 1983. 17(9): p. 411-419. 16. Bhadeshia, H.K.D.H. and D.V. Edmonds, Bainite in Silicon Steels - New Composition Property Approach .2. Metal Science, 1983. 17(9): p. 420-425. 17. I Tamura, H.S., T Tanaka, C Ouchi Thermomechanical processing of high-strength low-alloy steels 1988, Butterworths, England 18. Yang, H.S. and H.K.D.H. Bhadeshia, Austenite grain size and the martensite-start temperature. Scripta Materialia, 2009. 60(7): p. 493-495. 19. Barford, J. and W.S. Owen, Effect of austenite grain size and temperature on rate of bainite formation - REPLY. Journal of the Iron and Steel Institute, 1962. 200(JAN): p. 49-&. 20. Umemoto, M., K. Horiuchi, and I. 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Bhadeshia, Bainite Transformation Kinetics .1. Modified-Model. Materials Science and Technology, 1992. 8(11): p. 985-993. 33. Bhadeshia, H.K.D.H. and D.V. Edmonds, The Mechanism of Bainite Formation in Steels. Acta Metallurgica, 1980. 28(9): p. 1265-1273. 34. Bhadeshia, H.K.D.H., Bainite in Steels. 1992, London: The Institute of Materials. 35. Ali, A. and H.K.D.H. Bhadeshia, Growth-Rate Data on Bainite in Alloy-Steels. Materials Science and Technology, 1989. 5(4): p. 398-402. 36. Bhadeshia, H.K.D.H., A Rationalization of Shear Transformations in Steels. Acta Metallurgica, 1981. 29(6): p. 1117-1130. 37. Aaronson, H.I., et al. SYMPATHETIC NUCLEATION - AN OVERVIEW. 1995: Elsevier Science Sa Lausanne. 38. Takahashi, M. and H.K.D.H. Bhadeshia, Model for Transition from Upper to Lower Bainite. Materials Science and Technology, 1990. 6(7): p. 592-603. 39. Kalish, D. and M. Cohen, STRUCTURAL CHANGES AND STRENGTHENING IN STRAIN TEMPERING OF MARTENSITE. 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Materials Science and Technology, 2005. 21(11): p. 1293-1302. 47. Crosky, A., P.G. McDougall, and J.S. Bowles, THE CRYSTALLOGRAPHY OF THE PRECIPITATION OF ALPHA-RODS FROM BETA-CU-ZN ALLOYS. Acta Metallurgica, 1980. 28(11): p. 1495-1504. 48. Lin, W.T., Investigation on microstructure of superbainite, in MSE. 2008, National Taiwan University: Taipei. 49. Bhadeshia, H.K.D.H., High performance bainitic steels. Microalloying for New Steel Processes and Applications, 2005. 500-501: p. 63-74. 50. Caballero, F.G., et al., New experimental evidence on the incomplete transformation phenomenon in steel. Acta Materialia, 2009. 57(1): p. 8-17. 51. Shipway, P.H. and H.K.D.H. Bhadeshia, The mechanical stabilisation of Widmanstatten ferrite. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing, 1997. 223(1-2): p. 179-185. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/43136 | - |
dc.description.abstract | 在鋼鐵中添加約2wt%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,並藉由大量的晶界與差排強化,因此具有良好的韌性與強度,稱為超級變韌鐵。不用太過複雜的製程,但需要非常長時間的恆溫熱處理。因此本實驗著重在以不改變合金成分的前提下,利用不同沃斯田鐵晶粒尺寸來進行恆溫熱處理,並加速相變態。超級變韌鐵相變態過程為成核控制,主要成核位置是在沃斯田鐵晶界上,在先前沃斯田鐵晶粒尺寸較小的試樣中,由於晶界面積增加;成核位置增多,因此恆溫相變態初期,即相變態第一階段,有較快的相變態速度。但是隨著恆溫熱處理的進行,無論沃斯田鐵尺寸大小,新生的變韌鐵會借助於先前變韌鐵的尖端或是晶界成核,因此成核位置變多,變韌鐵變態會加速並達到穩定硬度,到達穩定硬度的變態時間是相差無幾的。但是沃斯田鐵會受到變韌鐵剪切相變態的影響,會有相對較高的應變與差排密度,會減緩甚至停止變韌鐵的變態,稱為沃斯田鐵的機械穩定化。此現象在沃斯田鐵晶粒尺寸相對較小的試樣中特別明顯,並且恆溫熱處理達到穩定硬度時,此試樣會擁有較低的變韌鐵比例。利用上述之結論,本研究設計了兩段式熱處理,利用先前沃斯田鐵晶粒尺寸較大的條件,先在變態速度較快,但整體硬度較差的300℃恆溫熱處理兩小時後,降溫至變態速度較慢,但是有較佳硬度的200℃繼續恆溫熱處理,檢視硬度結果達到穩定硬度的時間明顯的縮短,但是相對的也犧牲10%左右的硬度。 | zh_TW |
dc.description.abstract | Adding ~2wt% silicon to the carbon steel can produce carbide-free bainite under the proper environment. This kind of structure consists of a mixture of bainitic ferrite and carbon-enriched residual austenite. The steel is strengthening by lots of grain boundaries and dislocations; therefore it is so called “super-bainite” due to its excellent properties in tensile strength and toughness. It’s really simple to gain super-bainite through just the isothermal transformation; however it takes much heat treatment time. In this research, the method about accelerating bainite transformation just adjusts the prior austenite grain size without changing the alloy element composition design about the steel. Super-bainite transformation rate is nucleation control. The nucleation sites are mainly at the prior austenite grain boundary so that the fine prior austenite grain will increase not only the amount of nucleation sites but also the transformation rate due to the much more grain boundary area. At the beginning of isothermal transformation, the smaller prior austenite grains size the faster transformation rate. The higher bainite volume fraction will induce the faster transformation rate because the new bainite sub-unit can nucleate from the tip or grain boundary of the prior bainite sub-unit. No matter what the prior austenite grain size is, the transformation rate will tremendous speed up as heat treatment time goes by and cease while the hardness reaches a stable value. Different prior austenite grain size will take roughly the same time in order to reach their stable value of hardness. Once bainite transform more, the induced strain and also the dislocation density in austenite will increase more. These phenomena will let the austenite mechanical stabilize. Therefore, the increment of hardness is retarded by the mechanical stabilization of austenite. The smaller prior austenite grain will be induced more heavily strain, and the final hardness of the bainite transforming from the smaller prior austenite grain is lower than bainite which transforming from larger prior austenite grain. Because of the experiment result, we can introduce a new method about heat treatment. Bainite isothermal transformation at 300℃ can achieve faster transformation but lower hardness than transforming at 200℃. We can isothermal transform at 300℃for the first two hours and then at 200℃ for rest of the heat treatment time. As the result, the sacrifice about 10% hardness can accelerate the overall transformation time. | en |
dc.description.provenance | Made available in DSpace on 2021-06-15T01:38:47Z (GMT). No. of bitstreams: 1 ntu-98-R96527033-1.pdf: 27591715 bytes, checksum: 362e26ba8785fe6dcc8d03b29ec223ef (MD5) Previous issue date: 2009 | en |
dc.description.tableofcontents | 摘要 iii
Abstract iv 第二章:文獻回顧 1 2.1沃斯田鐵相變態 1 2.1.1合金元素對沃斯田鐵相變化的影響 2 2.1.2沃斯田鐵晶粒大小對相變態的影響 3 2.2麻田散鐵相變化 6 2.2.1麻田散鐵的一般特徵 7 2.2.2麻田散鐵的晶體結構學 8 2.2.3板條狀麻田散鐵 ( lath martensite ) 12 2.2.4板片麻田散鐵( plate martensite ) 13 2.2.5殘留沃斯田鐵的穩定性 13 2.3變韌鐵 14 2.3.1變韌鐵成核 14 2.2.2變韌鐵成長 16 2-2-3 The Matas and Hehemann Model 18 2.2.4 上變韌鐵( Upper bainite ) 20 2.2.5 下變韌鐵( Lower bainite ) 21 2.2.6超級變韌鐵 ( super bainite ) 23 2.2.8變韌鐵的晶體結構 25 2-2-9低溫變韌鐵恆溫相變態的加速-Previous work 26 第三章:研究方法 27 3.1實驗材料 27 3.2 實驗步驟與使用儀器 27 3.2.1穿透式電子顯微鏡 27 3.2.2場發射掃描式電子顯微鏡 28 3.2.3 電子背散射繞射儀EBSD ( Electron Back-Scattered Diffraction ) 28 3.2.4 OM試片制備 28 3.2.5 Hv微硬度測量 29 3.2.6 TEM試片製備 29 3.2.7 EBSD試片制備 29 3.2.8 SEM試片制備 29 3.3實驗方法 30 第四章:結果與討論 32 4.1先前沃斯田鐵晶粒大小 32 4.2恆溫熱處理 36 4.2.1 200℃恆溫熱處理對金相之影響 36 4.2.2 200℃恆溫熱處理後鋼材硬度比較 52 4.2.4 200℃恆溫熱處理對不同先前沃斯田鐵晶粒大小TEM結果分析 53 4.3 300℃恆溫熱處理 80 4.3.1 300℃恆溫熱處理對不同先前沃斯田鐵晶粒大小金相圖比較 80 4-3-2 300℃恆溫熱處理對不同先前沃斯田鐵晶粒大小硬度之影響 85 4.3.3 300℃恆溫熱處理對不同先前沃斯田鐵晶粒大小TEM比較 86 4-4 恆溫熱處理變態速率 105 4-4兩段式恆溫熱處理 111 第五章:結論 115 參考文獻 116 | |
dc.language.iso | zh-TW | |
dc.title | 先前沃斯田鐵晶粒尺寸對於超級變韌鐵之影響與微結構組織觀察 | zh_TW |
dc.title | Effect of prior austenite grain size on the transformation of superbainite | en |
dc.type | Thesis | |
dc.date.schoolyear | 97-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 王星豪,林東毅,張六文,黃慶淵 | |
dc.subject.keyword | 穿透式電子顯微鏡,相變態,變韌鐵,先前沃斯田鐵,晶粒尺寸, | zh_TW |
dc.subject.keyword | TEM,phase transformation,bainite,prior austenite,grain size, | en |
dc.relation.page | 119 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2009-07-16 | |
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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