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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/61205完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 楊哲人(Jer-Ren Yang) | |
| dc.contributor.author | Yu-Wei Lai | en |
| dc.contributor.author | 賴昱維 | zh_TW |
| dc.date.accessioned | 2021-06-16T10:53:00Z | - |
| dc.date.available | 2020-07-22 | |
| dc.date.copyright | 2020-07-22 | |
| dc.date.issued | 2020 | |
| dc.date.submitted | 2020-07-02 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/61205 | - |
| dc.description.abstract | 無碳化物析出變韌鐵可以藉由在鋼鐵中添加1.5wt%的矽並經過適當的熱處理得到。此種結構主要是由束狀變韌肥粒鐵及高碳含量的殘量沃斯田鐵所組成，且具有良好的強度及韌性。些許塊狀的麻田散鐵/沃斯田鐵混和相亦存在於結構中，於降溫的階段時有可能會由沃斯田鐵分解成麻田散鐵相。此種塊狀麻田散鐵會對機械性質造成嚴重的影響。因此，沃斯田鐵的穩定性在提升鋼鐵性質中扮演一個很重要的角色。 在本篇研究中，著重於低溫的沃斯回火熱處理，我們發現由於TRIP效應的原因，含有變韌鐵組織的中碳鋼相對於低碳鋼，能在不犧牲材料伸長量的前提下，擁有更高的強度。後續則藉由XRD、EBSD及TEM技術來研究沃斯田鐵的穩定性及在材料塑性變形時的顯微結構演變。可以得知含有較高碳含量的鋼鐵具有更好的沃斯田鐵穩定性。塊狀沃斯田鐵也可以在中碳的變韌鐵組織裡面被保留到室溫。 | zh_TW |
| dc.description.abstract | Carbide-free bainite can be obtained by alloying over 1.5 wt% silicon (Si) in steels with appropriate heat treatments. This structure comprises of bainitic ferrite and carbon-enriched retained austenite, which possesses great combination of strength and toughness because of the TRIP effect. Some blocky martensite-austenite constituents also exist in the matrix, which might decompose into martensite at the cooling stage. Blocky martensite has detrimental effect to the mechanical properties. Therefore, the stability of retained austenite in the microstructure plays an important role in enhancing the quality of steels. In this research, low austempering temperature heat treatments were conducted. We discovered that the medium-carbon bainitic steels possess better tensile strength than low-carbon bainitic steels without sacrificing the elongation because of noticeable TRIP effect. Further investigations on the stability of austenite and the microstructure evolution during plastic deformation were also conducted by XRD, EBSD and TEM techniques. We found that the stability of austenite increases as the carbon content of steels increases. Blocky austenite can also be retained to the ambient temperature in medium-carbon bainitic steels. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-16T10:53:00Z (GMT). No. of bitstreams: 1 U0001-3006202015272500.pdf: 14747011 bytes, checksum: 7bc148b803a6ed5a92ee97162921b72e (MD5) Previous issue date: 2020 | en |
| dc.description.tableofcontents | 誌謝 i 中文摘要 ii ABSTRACT iii CONTENTS iv LIST OF FIGURES vii LIST OF TABLES xii Chapter 1 Introduction 1 Chapter 2 Literature Review 2 2.1 Bainite Transformation 2 2.1.1 Phase Transformations in Steels 2 2.1.2 Introduction to Bainite 4 2.1.3 Nucleation 6 2.1.4 Growth 9 2.1.5 Orientation Relationship 12 2.2 Types of Bainite 15 2.2.1 Traditional Bainite 15 2.2.2 Carbide-Free Bainite 19 2.3 TRIP Steel 22 2.3.1 Introduction 22 2.3.2 Alloying Design 23 2.3.3 Retained Austenite in TRIP Steels 26 Chapter 3 Experimental Procedure 29 3.1 Experimental materials 29 3.2 Specimen 30 3.2.1 Specimen Size 30 3.2.2 Specimen Preparation for OM and SEM 31 3.2.3 Specimen Preparation for EBSD 31 3.2.4 Specimen Preparation for XRD 31 3.2.5 Specimen Preparation for TEM 32 3.3 Instruments 33 3.3.1 Dilatometer 33 3.3.2 Optical Microscope (OM) 33 3.3.3 Scanning Electron Microscope (SEM) 34 3.3.4 Transmission Electron Microscope (TEM) 34 3.3.5 Electron Back-Scattered Diffraction (EBSD) 34 3.3.6 X-Ray Diffractometer (XRD) 34 3.3.7 Vickers Hardness Tester 35 3.3.8 Tensile Testing Machine 35 3.4 Experimental Design 36 3.4.1 Different Austempering Temperatures for Bainite 36 3.4.2 Near-Ms Austempering Process 37 Chapter 4 Different Austempering Temperatures for Bainite 39 4.1 Dilatometric Study 39 4.2 Mechanical Behavior 41 4.3 Overall Morphology 43 4.4 XRD Analysis 48 4.5 Thickness Statistics 50 Chapter 5 Near-Ms Austempering Process 52 5.1 Overall Morphology 52 5.2 Mechanical Behavior 55 5.3 XRD and EBSD Analysis 60 5.4 Thickness Statistics 65 5.5 TEM Observation 69 5.5.1 Microstructures 69 5.5.2 Microstructure Evolution 78 Chapter 6 Conclusion 87 Chapter 7 Future work 89 Reference 90 | |
| dc.language.iso | en | |
| dc.subject | 變韌鐵 | zh_TW |
| dc.subject | 沃斯回火 | zh_TW |
| dc.subject | 穿透式電子顯微鏡 | zh_TW |
| dc.subject | 相變誘導塑性 (TRIP) | zh_TW |
| dc.subject | 結構演變 | zh_TW |
| dc.subject | 相變化 | zh_TW |
| dc.subject | Phase Transformation | en |
| dc.subject | Austempering | en |
| dc.subject | Bainite | en |
| dc.subject | Transmission Electron Microscopy | en |
| dc.subject | TRIP effect | en |
| dc.subject | Microstructure Evolution | en |
| dc.title | 低溫沃斯回火對無碳化物析出變韌鐵顯微結構的演變及機械性質之影響 | zh_TW |
| dc.title | Effects of Low Temperature Austempering on the Microstructure Evolution and Mechanical Properties of Carbide-Free Bainite | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 108-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 葉均蔚(Jien-Wei Yeh),王星豪(Shing-Hoa Wang),王樂民(Le-Min Wang),陳志遠(Chih-Yuan Chen) | |
| dc.subject.keyword | 變韌鐵,沃斯回火,穿透式電子顯微鏡,相變誘導塑性 (TRIP),結構演變,相變化, | zh_TW |
| dc.subject.keyword | Bainite,Austempering,Transmission Electron Microscopy,TRIP effect,Microstructure Evolution,Phase Transformation, | en |
| dc.relation.page | 93 | |
| dc.identifier.doi | 10.6342/NTU202001210 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2020-07-03 | |
| 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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