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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 楊哲人 | zh_TW |
| dc.contributor.advisor | Jer-Ren Yang | en |
| dc.contributor.author | 游雨蓁 | zh_TW |
| dc.contributor.author | Yu-Jhen You | en |
| dc.date.accessioned | 2024-09-11T16:09:11Z | - |
| dc.date.available | 2024-09-12 | - |
| dc.date.copyright | 2024-09-11 | - |
| dc.date.issued | 2024 | - |
| dc.date.submitted | 2024-08-08 | - |
| dc.identifier.citation | 1. Davis, J. R. (1994). Stainless steels /Edited by J.R. Davis. ASM specialty handbook. 1994, Materials Park, Ohio: ASM International.
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A, 42A, 3543-3548. 59. Xu, Z., Ding, Z., Liang, B. (2018). The Observation of the Structure of M23C6/γ Coherent Interface in the 100Mn13 High Carbon High Manganese Steel. Metallurgical and Materials Transactions A, 49, 836-841. 60. Ding, Z., Liang, B., Zhao, R., Chen, C. (2015). Precipitation of carbides in early aging stages and their crystallographic orientations in Hadfield steel Mn13. Metal Science and Heat Treatment, 57, 18-21. 61. Taillard, R., Pineau, A. (1982). Room temperature tensile properties of Fe-19wt.% Cr alloys precipitation hardened by the intermetallic compound NiAl. Materials Science and Engineering, 56(3), 219-231. 62. Xi, W., Yin, S., Lai, H. (2003). Microstructure and mechanical properties of stainless steel produced by centrifugal-SHS process. Journal of materials processing technology, 137(1-3), 1-4. 63. Dahmen, U. (1982). Orientation relationships in precipitation systems. Acta Metallurgica, 30(1), 63-73. 64. Ashby, M. F. (1966). 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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/95491 | - |
| dc.description.abstract | 本實驗採用華新麗華公司提供的 17-7PH 不鏽鋼作為研究材料，進行相辨認以及析出強化之研究。17-7PH 不鏽鋼是一種析出硬化型不鏽鋼，具有優異耐疲勞、良好耐腐蝕性與良好成形性等優點。17-7PH 除了添加不鏽鋼常見的鉻和鎳元素之外，也添加鋁與氮元素，目的是使 AlN 達成晶粒細化和 NiAl 能實踐析出強化效果。
實驗的第一部分會先將華新麗華所提供的 HR 原材進行 EBSD、KAM、IQ 分析，以區別此材料複雜的相組織；第二部分進行 RH950 標準熱處理，淬火後的 17-7PH 鋼可以透過進一步深冷處理增加麻田散鐵的相變驅動力，根據標準規範，深冷處理藉由將材料冷至 –75℃ 持溫 8 小時實現。由前人研究報導可知 17-7PH 鋼種深冷處理過程涉及恆溫麻田散鐵相變，故於本論文一大工作目的是展現 17-7 PH 鋼中恆溫麻田散鐵形成的實驗證據；第三部分則是分別進行 510°C 持溫不同時間(0 至 4.5 小時)的時效處理，期望 NiAl 成核於麻田散鐵基地，實踐析出強化，過程中以 OM、TEM、 STEM 儀器進行觀察，發現 NiAl 僅需要經由短時間時效處理就會廣泛地均質成核於麻田散鐵基地內，且在後續時效階段會逐漸在缺陷處粗化。本研究的最後則進行拉伸試驗與破斷面觀察，得知此材料的破裂機制屬於延性與脆性破裂共存之混合模式。 | zh_TW |
| dc.description.abstract | This study used the 17Cr-7Ni PH stainless steel provided by Walsin Lihwa Company for phase identification analysis and precipitate hardening research. Alloy 17-7PH is precipitation-hardening stainless steel with excellent fatigue properties, corrosion resistance, and formability. Its composition contains Al and N elements for grain refinement and precipitate hardening by AlN and NiAl, respectively.
In the first part, the HR samples were analyzed by the EBSD, KAM, and IQ techniques to distinguish the mixed phase of this material. In the second part, the RH950 standard heat treatment was conducted. Complete martensite transformation into martensite in as-quenched 17-7 PH steel can be achieved by increasing the driving force for martensite formation with further undercooling at sub-zero Celsius temperature. According to standard heat treatment specifications, it is performed by cooling the material to –75℃, followed by isothermal holding at this temperature for 8 hours. This work shows the direct experimental evidence of isothermal martensite in 17-7 PH steel. In the third part, 510°C aging treatment for various times (0~4.5h) was conducted to achieve the effect of precipitate hardening, as well as observed and analyzed statistically by OM, TEM, and STEM, so we can conclude NiAl precipitates nucleated widely in the martensitic matrix by homogeneous nucleation, and these precipitates coarsened at defects after longer aging time. Finally, the tensile test was conducted to evaluate the mechanical properties of this material, and fractographs were taken by SEM. The SEM result shows the fracture surface may be the mixed mode fracture. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2024-09-11T16:09:11Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2024-09-11T16:09:11Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 論文口試委員會審訂書 #
謝辭 i 摘要 iii Abstract iv 目次 v 圖次 viii 表次 xxiii 第一章 前言 1 第二章 文獻回顧 2 2.1 不鏽鋼及半沃斯田鐵系不鏽鋼 2 2.1.1 不鏽鋼分類與命名方式 2 2.1.2 半沃斯田鐵系不鏽鋼 4 2.1.3 半沃斯田鐵系不鏽鋼常見熱處理流程 8 2.2 麻田散鐵特徵 11 2.2.1 麻田散鐵相變 11 2.2.2 麻田散鐵晶體結構 12 2.2.3 麻田散鐵相變態理論 13 2.2.4 麻田散鐵之分類 19 2.2.5 板條狀麻田散鐵方位關係 22 2.2.6 板條狀麻田散鐵的形貌與階層結構 30 2.2.7 影響麻田散鐵起始溫度之因素 32 2.3 麻田散鐵相變動力學 38 2.3.1 麻田散鐵相變態形式 38 2.3.2 古典麻田散鐵相變化 38 2.3.3 恆溫(Isothermal)麻田散鐵相變 40 2.3.4 麻田散鐵相變動力學 46 2.3.5 自催化成核與麻田散鐵恆溫相變態 Pati-Cohen 模型 52 2.4 沃斯田鐵機械穩定性 58 2.5 17-7 PH不鏽鋼於熱處理後常見的析出物 59 2.5.1 氮化鋁析出行為 59 2.5.2 碳化鉻析出行為 62 2.5.3 鎳鋁析出行為 67 第三章 研究方法 70 3.1 實驗材料 70 3.2 熱處理步驟 72 3.3 實驗儀器與試片製備 74 3.4 分析軟體 81 第四章 結果與討論 83 4.1 Thermo − Calc 83 4.2 均質化與熱軋完材料(HR 原材)微結構觀察 89 4.2.1 光學金相 89 4.2.2 EBSD 相辨認與 KAM 分析 89 4.2.3 HR 原材 TEM 形貌簡介 98 4.2.4 HR 原材中 AlN 之 TEM 觀察 103 4.2.5 HR 原材中常見方位關係 106 4.3 深冷處理階段 EBSD 相比例與 KAM 分析 108 4.4 XRD 分析 120 4.5 熱示差掃描分析儀 DSC 分析 123 4.6 沃斯田鐵 125 4.6.1 沃斯田鐵的雙晶誘發塑性 125 4.6.2 沃斯田鐵的機械穩定性 135 4.6.3 沃斯田鐵相變誘發塑性 143 4.6.4 時效處理與殘留沃斯田鐵粗化 147 4.7 麻田散鐵相變化 161 4.7.1 雙晶組織 161 4.7.2 穿透雙晶 174 4.8 碳化鉻之 TEM 觀察 184 4.9 時效處理對於 17-7 PH 不鏽鋼之機械性質與微結構觀察 196 4.9.1 硬度測試 196 4.9.2 NiAl 析出行為與 TEM 觀察條件 199 4.9.3 NiAl 於 TEM 之觀察 215 4.9.4 STEM 模式下對於差排和 NiAl 之觀察 231 4.10 拉伸測試與其破斷面觀察 235 4.10.1 拉伸測試 235 4.10.2 拉伸試棒破斷面觀察 238 第五章 結論 240 第六章 未來工作 242 參考文獻 243 | - |
| dc.language.iso | zh_TW | - |
| dc.title | 17-7 析出硬化型半沃斯田鐵系不鏽鋼相變態特性及顯微組織研究 | zh_TW |
| dc.title | The characteristics of phase transformation and microstructure in 17-7 precipitate-hardened semi-austenitic stainless steel | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 112-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 鍾采甫;王樂民;蘇德徵;陳志遠 | zh_TW |
| dc.contributor.oralexamcommittee | Tsai-Fu Chung;Le-Min Wang;Te-Cheng Su;Chih-Yuan Chen | en |
| dc.subject.keyword | 17-7P不鏽鋼鋼,深冷處理,恆溫麻田散鐵,鎳鋁,析出強化, | zh_TW |
| dc.subject.keyword | 17Cr-7Ni PH stainless steel,Subzero treatment,Isothermal martensite,NiAl precipitates,Precipitate hardening, | en |
| dc.relation.page | 250 | - |
| dc.identifier.doi | 10.6342/NTU202403346 | - |
| dc.rights.note | 未授權 | - |
| dc.date.accepted | 2024-08-10 | - |
| dc.contributor.author-college | 工學院 | - |
| dc.contributor.author-dept | 材料科學與工程學系 | - |
| 顯示於系所單位： | 材料科學與工程學系 | |
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