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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 顏鴻威(Hung-Wei Yen) | |
| dc.contributor.author | Yu-Cheng Su | en |
| dc.contributor.author | 蘇游程 | zh_TW |
| dc.date.accessioned | 2022-11-24T03:29:06Z | - |
| dc.date.available | 2021-08-24 | |
| dc.date.available | 2022-11-24T03:29:06Z | - |
| dc.date.copyright | 2021-08-24 | |
| dc.date.issued | 2021 | |
| dc.date.submitted | 2021-08-21 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/81071 | - |
| dc.description.abstract | 本研究設計了一款新型的麻時效不鏽鋼，其設計理念源自於介穩態沃斯田鐵、析出硬化型鋼與多重析出反應，不同於傳統的麻田散鐵透過快速冷卻而成，本研究中的麻田散鐵是透過變形而得，實驗結果發現，相變態能透過常溫軋延與低溫軋延達成，隨著軋延量上升或是軋延溫度下降，相變態的比例也隨之提高。透過穿透式電子顯微鏡的觀察，其顯微結構為條狀麻田散鐵，伴隨一部分未相變的沃斯田鐵，在沃斯田鐵中能觀察到變形雙晶與剪切帶的存在，而麻田散鐵從剪切帶的相交處生成。 時效過後，因為兩種界金屬析出物的強化效果，使本材料得到極高的強度，但延展性則在時效後變差，此兩種析出物分別為富鉻、鉬的R相與Ni3Ti η 相。同時，時效的過程中會伴隨沃斯田鐵比例上升，其上升的量與時效條件和起始的微結構有關，進而影響到材料的強度。 此外，本實驗也透過控制鎳元素的添加量，觀察鎳對顯微結構與機械性能的影響，實驗後發現，較低的鎳含量能使麻田散鐵相變態不論在常溫或低溫軋延皆更容易發生，一旦材料中的沃斯田鐵全都相變成麻田散鐵，後續的壓延將導致裂紋產生。但機械性能的部分並不隨鎳含量而有顯著的差異。 | zh_TW |
| dc.description.provenance | Made available in DSpace on 2022-11-24T03:29:06Z (GMT). No. of bitstreams: 1 U0001-2008202115231500.pdf: 11274075 bytes, checksum: 48f83b12ef44d02415cda7ae96e47f53 (MD5) Previous issue date: 2021 | en |
| dc.description.tableofcontents | 口試委員審定書 I 誌謝 II 摘要 III ABSTRACT IV CONTENTS V Figures Content VIII Tables Content XIV Chapter 1 Introduction 1 Chapter 2 Literature Review 2 2.1 Maraging Steels 2 2.1.1 Introduction to Maraging steels 2 2.1.2 Alloy Design of Maraging steel 4 2.1.3 Mechanical Property of Maraging steel 6 2.2 Martensitic Transformation 8 2.2.1 Introduction to Martensitic transformation 8 2.2.2 The relationship between Ms temperature and applied stress 9 2.2.3 Austenite Stability 11 2.3 Deformation Induced Martensite and Austenite Reversion 15 2.3.1 Deformation Induced Martensite 15 2.3.2 Austenite Reversion 19 2.4 Precipitate Behavior in Maraging Steels 20 2.4.1. R-Phase 20 2.4.2. η-Ni3Ti Phase 22 2.4.3. B2 NiAl Phase 23 2.4.4. Laves phase 24 Chapter 3 Experimental Procedures 25 3.1 Alloy design of Maraging steel 25 3.2 Experimental Process 28 3.3 Microstructure Characterization 29 3.3.1 Optical Microscopy (OM) 29 3.3.2 X-ray Diffraction (XRD) 29 3.3.3 Scanning Electron Microscopy (SEM) 30 3.3.4 Electron Probe Micro-Analyzer (EPMA) 30 3.3.5 Electron Backscattered Diffraction (EBSD) 30 3.3.6 Transmission Kikuchi Diffraction (TKD) 31 3.3.7 Transmission Electron Microscopy (TEM) 31 3.4 Mechanical Test 32 3.4.1 Vickers Hardness 32 3.4.2 Tensile Test 32 3.4.3 Nanoindentation 32 Chapter 4 Microstructure Evolution in Deformed Aged Process and Mechanical Properties 34 4.1 Experimental Results 34 4.1.1 Microstructure Control 34 4.1.2 Microstructure Evolution in Deformed Process 38 4.1.3 Nanostructure Evolution in Aged Process 44 4.1.4 Mechanical Properties 56 4.2 Discussion 63 4.2.1 Relationship between Processing and Microstructure 63 4.2.2 Relationship between Microstructure and Mechanical Properties 68 4.3 Summary 71 Chapter 5 Effect of Ni Content on Microstructure and Mechanical Properties 72 5.1 Experimental Result and Discussion 72 5.1.1 As Cast and Homogenized Microstructures 72 5.1.2 Microstructure Evolution in Deformed Aged Process 76 5.1.3 Mechanical Properties 81 5.2 Summary 88 Chapter 6 Conclusion 89 Chapter 7 Future work 90 Reference 92 | |
| dc.language.iso | en | |
| dc.subject | 共析出 | zh_TW |
| dc.subject | 冷軋 | zh_TW |
| dc.subject | 低溫軋延 | zh_TW |
| dc.subject | 不鏽鋼 | zh_TW |
| dc.subject | 麻時效鋼 | zh_TW |
| dc.subject | 麻田散鐵相變化 | zh_TW |
| dc.subject | stainless steel | en |
| dc.subject | cold rolling | en |
| dc.subject | co-precipitates | en |
| dc.subject | maraging steel | en |
| dc.subject | cryo-rolling | en |
| dc.subject | martensitic transformation | en |
| dc.title | 變形暨時效中熵麻時效不鏽鋼顯微結構與機械性能之研究 | zh_TW |
| dc.title | Study on Microstructure and Mechanical Properties in Deformed-and-Aged Medium-Entropy Maraging Stainless Steel | en |
| dc.date.schoolyear | 109-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 王星豪(Hsin-Tsai Liu),陳志軒(Chih-Yang Tseng),陳世偉 | |
| dc.subject.keyword | 麻時效鋼,不鏽鋼,冷軋,低溫軋延,麻田散鐵相變化,共析出, | zh_TW |
| dc.subject.keyword | maraging steel,stainless steel,cold rolling,cryo-rolling,martensitic transformation,co-precipitates, | en |
| dc.relation.page | 100 | |
| dc.identifier.doi | 10.6342/NTU202102553 | |
| dc.rights.note | 同意授權(限校園內公開) | |
| dc.date.accepted | 2021-08-23 | |
| 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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