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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 | Ting-Mu Chuang | en |
dc.contributor.author | 莊庭牧 | zh_TW |
dc.date.accessioned | 2021-06-08T03:38:44Z | - |
dc.date.copyright | 2019-07-25 | |
dc.date.issued | 2019 | |
dc.date.submitted | 2019-07-16 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/21583 | - |
dc.description.abstract | 在鋼鐵中添加約1.5-2.0 wt%的矽並且設計適當的熱處理可以生成無碳化物析出變韌鐵,此種結構主要是由束狀變韌鐵以及富高碳含量的殘留沃斯田鐵和些許的塊狀麻田散鐵所組成,具此種結構的鋼具有良好的強度以及韌性,但此種鋼隨著碳含量的上升,其反應速率也會跟著下降,進而使整體反應時間拉長,所以添加的元素對於其影響十分重要。另外,透過熱處理的設計也可以達到降低反應時間的效果,例如二階段式熱處理。本篇研究著重於探討改變碳含量及使用二階段式熱處理對變韌鐵之微結構及機械性質的影響。當碳含量增加,整體反應溫度會下降,使反應時間較長且組織會有細化的效果,而殘留沃斯田鐵的量也會因為基底和從過飽合變韌鐵中排出的碳增加而得到提升,進而使整體機械性質得到提升。透過EBSD和TEM的分析也可以發現層狀沃斯田鐵因含有較多比例的碳,所以降到室溫時能穩定存在。將變韌鐵組織進行慢速升溫時會發現,層狀沃斯田鐵會分解成碳化物加上肥粒鐵。另外,透過二階段式熱處理,在相對高溫下放一小段時間長出些許變韌鐵,再降到低溫完成反應可以有效縮短低溫變韌鐵成核期所需要的時間,達到加速反應速率的效果,且因為有兩個階段的熱處理,最終結構中也會有粗細不同的束狀變韌鐵,二階段式熱處理過後的材料強度及硬度會略微下降,其原因也是和具有一部份較粗的變韌鐵有關。 | zh_TW |
dc.description.abstract | By alloying 1.5-2.0 wt% silicon in the steels and designing appropriate heat treatments, carbide-free bainite can be produced. This structure is consisted of plate-liked bainite and high carbon content retained austenite plus some blocky martensite. The steels with such structure include outstanding strength and toughness. However, as carbon content increases, the reaction rate reduces and the time for completion bainite transformation last longer. Therefore, alloying elements play an important role in affecting the properties of bainitic steels. In addition, by modifying the heat treatments can also reach the goal in decreasing the reaction time, such as two-step isothermal transformation. In this research, we are focusing on investigating the microstructure and mechanical properties in bainite by changing the amount of carbon and after undergoing two-step isothermal transformation. When the carbon content raises, overall reaction temperature will be lower, which causes the reaction time increase and the structure refinement. The quantity of retained austenite will also increase since the carbon rejected by bainite raised. The effects mention above lead to the mechanical properties’ enhancement. TEM and EBSD analysis indicate that only high carbon film-liked austenite will appear at ambient temperature. Moreover, by utilizing two-step isothermal transformation, which we put the specimen at a slightly higher temperature for a while to form some bainite, and then cool to lower temperature to complete the reaction can effectively shorten the time for nucleation and leads to the acceleration of low temperature bainite reaction. Furthermore, the contribution of this heat treatment will form different size of bainite and hence results in the reduction of strength and hardness. | en |
dc.description.provenance | Made available in DSpace on 2021-06-08T03:38:44Z (GMT). No. of bitstreams: 1 ntu-108-R06527055-1.pdf: 10039111 bytes, checksum: 520a437e74efde058389b89b4abae545 (MD5) Previous issue date: 2019 | en |
dc.description.tableofcontents | 致謝 I
摘要 II Abstract III Content V Figures Content VII Tables Content XVIII Chapter 1 - Introduction 1 Chapter 2 - Literature Review 2 2.1 Bainite Transformation 2 2.1.1 Introduction 2 2.1.2 Nucleation 5 2.1.3 Growth 9 2.1.4 Upper Bainite 12 2.1.5 Lower Bainite 14 2.2 Carbide-free Bainite 19 2.2.1 Introduction 19 2.2.2 Alloy Design 23 2.2.3 TRIP Steels 25 2.2.4 Two-step Isothermal Transformation 29 Chapter 3 - Experimental Procedure 31 3.1 Experimental Alloys 31 3.2 Specimen 32 3.2.1 Specimen Size 32 3.2.2 Specimen Preparations for OM and SEM 33 3.2.3 Specimen Preparations for EBSD 33 3.2.4 Specimen Preparations for XRD 34 3.2.5 Specimen Preparations for TEM 34 3.3 Instruments 35 3.3.1 Dilatometer and Gleeble 35 3.3.2 Optical Microscope (OM) 35 3.3.3 Scanning Electron Microscope (SEM) 36 3.3.4 Electron Backscattered Diffraction (EBSD) 36 3.3.5 X-Ray Diffractometer (XRD) 36 3.3.6 Transmission Electron Microscope (TEM) 36 3.3.7 Vickers Hardness Testing Machine 37 3.3.8 Tensile Testing Machine 37 3.4 Experiment Design 38 3.4.1 Different Carbon Content in Bainite 38 3.3.2 Two-Step Isothermal Transformation 39 Chapter 4 - Different carbon content in Bainite 41 4.1 Dilatometric measurement and overall morphology 41 4.2 TEM observation 48 4.3 XRD and EBSD analysis 59 4.4 Mechanical behavior 63 4.5 Austenite transformation during continuous heating 68 Chapter 5 - Two-Step Isothermal Transformation 76 5.1 Dilatometric comparison and overall morphology 76 5.2 TEM observation 84 5.3 XRD analysis and mechanical behavior 91 Chapter 6 - Conclusions 99 Chapter 7 - Future Works 101 Reference 102 | |
dc.language.iso | en | |
dc.title | 碳含量及二階段相變態對無碳化物變韌鐵的顯微結構及機械性質之影響 | zh_TW |
dc.title | The Effect of Carbon Content and Two-step Transformation on the Microstructure and Mechanical Properties of Carbide-free Bainite | en |
dc.type | Thesis | |
dc.date.schoolyear | 107-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 林新智,王星豪,陳志遠,黃慶淵 | |
dc.subject.keyword | 變韌鐵,穿透式電子顯微鏡,相變態,碳含量,二階段式熱處理, | zh_TW |
dc.subject.keyword | Bainite,Transmission Electron Microscope,Phase Transformation,Carbon content,Two-step Isothermal Transformation, | en |
dc.relation.page | 104 | |
dc.identifier.doi | 10.6342/NTU201901495 | |
dc.rights.note | 未授權 | |
dc.date.accepted | 2019-07-17 | |
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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