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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 林招松 | zh_TW |
| dc.contributor.advisor | Chao-Sung Lin | en |
| dc.contributor.author | 洪偉峻 | zh_TW |
| dc.contributor.author | Wei-Jyun Hong | en |
| dc.date.accessioned | 2024-08-14T16:22:20Z | - |
| dc.date.available | 2024-08-15 | - |
| dc.date.copyright | 2024-08-13 | - |
| dc.date.issued | 2024 | - |
| dc.date.submitted | 2024-08-05 | - |
| dc.identifier.citation | [1] P. De Tiedra, Ó. Martín, and M. San-Juan, "Potentiodynamic study of the influence of gamma prime and eta phases on pitting corrosion of A286 superalloy," Journal of Alloys and Compounds, vol. 673, pp. 231-236, 2016.
[2] U. Ali, M. S. Qurashi, P. O. Lartey, X. Jin, and J. Qiao, "Influence of η-(Ni3Ti) and TiC phases on corrosion resistance and mechanical properties of A286 austenitic superalloy after heat treatment," International Journal of Electrochemical Science, p. 100208, 2023. [3] Z. Guo, H. Liang, M. Zhao, and L. Rong, "Effect of boron addition on hydrogen embrittlement sensitivity in Fe–Ni based alloys," Materials Science and Engineering: A, vol. 527, no. 24-25, pp. 6620-6625, 2010. [4] G. Liu, C. Huang, H. Zhu, Z. Liu, Y. Liu, and C. Li, "The modified surface properties and fatigue life of Incoloy A286 face-milled at different cutting parameters," Materials Science and Engineering: A, vol. 704, pp. 1-9, 2017. [5] R. Muraca and J. Whittick, "Materials data handbook: Stainless steel alloy A-286," 1972. [6] M. Seifollahi, S. H. Razavi, S. Kheirandish, and S. M. Abbasi, "Effect of minor Zr addition on γ′ and η phase precipitation and tensile properties of A286 superalloy," 2017. [7] M. 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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/94036 | - |
| dc.description.abstract | A286超合金是一種具有優異抗蝕性及高溫強度的材料，被廣泛應用於航空航天和能源領域。本研究主要探討Ti(C, N)二次相對A286超合金的腐蝕行為之影響，並以動電位極化曲線、循環動電位極化曲線等電化學方法進行分析。本研究採用兩種不同熱處理方式處理A286超合金，並選取316L不鏽鋼作為對照組。透過光學顯微鏡(OM)和掃描電子顯微鏡(SEM)觀察材料表面微結構變化，並利用穿透式電子顯微鏡(TEM)和能量散射X射線譜(EDS)分析介在物的化學組成。
研究結果顯示，A286合金中晶出物主要為Ti(C, N)，其多在熔湯冷卻時以CaO、MgO、CaS等介在物為核心形成。這些Ti(C, N)晶出物在孔蝕過程中扮演著重要角色，A286合金上的孔蝕多由Ti(C, N)晶出物開始，與固溶後形成的析出物無關。電化學測試結果顯示，相較於316L不鏽鋼，A286合金在電渣重溶(ESR)後具有極低的硫含量，因此孔蝕多由氧化物引發，且大多數孔蝕會再鈍化，只有極少數能成長到穩態階段。具體而言，孔蝕可分為三個階段：第一階段，CaO優先溶解，形成約1-2微米的圓形蝕孔；第二階段，Ti(C, N)晶出物周圍的基材開始溶解，蝕孔擴展至5-10微米，形狀較不規則；第三階段，Ti(C, N)晶出物脫落，形成光滑的半球形蝕孔，大小超過10微米。此外，在孔蝕處還觀察到Ni優先溶解的現象，這與孔蝕處的電位和酸性環境有關。總結來說，Ti(C, N)二次相在A286超合金的孔蝕行為中扮演關鍵角色。其周圍基材的溶解以及晶出物的脫落，最終形成穩態孔蝕。這些發現對於進一步改進A286合金的抗腐蝕性能具有重要意義。 | zh_TW |
| dc.description.abstract | A286 superalloy is a material with excellent corrosion resistance and high-temperature strength, widely used in aerospace and energy fields. This study mainly investigates the effect of micron-scale Ti(C, N) on the corrosion behavior of A286 superalloy through electrochemical methods such as potentiodynamic polarization curves and cyclic potentiodynamic polarization curves. Two different heat treatment methods were applied to the A286 superalloy, and 316L stainless steel was selected as the control group. The surface microstructure changes of the materials were observed using optical microscope (OM) and scanning electron microscope (SEM). The chemical composition of the precipitates was analyzed using a transpassive electron microscope (TEM) and energy-dispersive X-ray spectroscopy (EDS).
The results show that the constituent particles in the A286 alloy are mainly Ti(C, N), which mostly form around inclusions such as CaO, MgO, and CaS during molten cooling. These Ti(C, N) constituent particles play a crucial role in the pitting corrosion process. Specifically, pitting corrosion in the A286 alloy generally starts from the Ti(C, N) constituent particles and is unrelated to the precipitates formed after solution treatment. Electrochemical tests indicate that, compared to 316L stainless steel, the A286 alloy has an extremely low sulfur content after electro slag remelting, so pitting corrosion is mostly initiated by oxides. Most pits will repassivate, and only a few can grow to a stable stage. Specifically, pitting can be divided into three stages: in the first stage, CaO preferentially dissolves, forming circular pits about 1-2 micrometers in size; in the second stage, the matrix around the Ti(C, N) constituent particles begins to dissolve, expanding the pits to 5-10 micrometers with irregular shapes; in the third stage, the Ti(C, N) constituent particles fall off, forming smooth hemispherical pits larger than 10 micrometers. Moreover, preferential dissolution of Ni at the pitting sites was observed, which is related to the potential and acidic environment at the pitting sites. In summary, the micron-scale Ti(C, N) plays a crucial role in the pitting corrosion behavior of the A286 superalloy. The dissolution of the matrix around the constituent particles and the shedding of the constituent particles eventually form stable pits. These findings are significant for further improving the corrosion resistance of the A286 alloy. | en |
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| dc.description.provenance | Made available in DSpace on 2024-08-14T16:22:20Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 口試委員會審定書 i
學術論文原創性比對 ii 誌謝 iii 中文摘要 iv ABSTRACT v 目次 vii 圖次 x 表次 xiv Chapter 1 前言 1 Chapter 2 文獻回顧 2 2.1 超合金基本性質 2 2.1.1 A286超合金簡介 2 2.1.2 添加之其他元素 3 2.1.3 熱處理 5 2.2 腐蝕分類 6 2.2.1 均勻腐蝕 (Uniform corrosion) 7 2.2.2 伽凡尼腐蝕 (Galvanic corrosion) 7 2.2.3 間隙腐蝕 (Crevice corrosion) 8 2.2.4 孔蝕 (Pitting corrosion) 8 2.2.5 沿晶腐蝕 (Intergranular corrosion) 9 2.2.6 剝離 (Selective leaching) 10 2.2.7 沖蝕 (Erosion corrosion) 10 2.2.8 應力腐蝕 (Stress corrosion) 11 2.3 孔蝕簡介 11 2.3.1 鈍化膜之形成 12 2.3.2 鈍化膜破壞機制 14 2.3.3 介在物引發之孔蝕 18 2.3.4 介穩態孔蝕(metastable pitting)與穩態孔蝕(stable pitting) 25 2.3.5 環境對孔蝕之影響 27 Chapter 3 實驗步驟與方法 31 3.1 實驗流程 31 3.2 試片製備 32 3.2.1 材料簡介 32 3.2.2 試片前處理 34 3.3 顯微結構分析 34 3.3.1 光學顯微鏡(OM) 34 3.3.2 掃描式電子顯微鏡(SEM) 35 3.3.3 穿透式電子顯微鏡(TEM) 36 3.3.4 能量散射X射線譜(EDS) 36 3.3.5 聚焦離子束顯微鏡(FIB) 37 3.4 電化學測試 37 3.4.1 動電位極化曲線及循環動電位極化曲線 38 3.4.2 恆電位極化測試 (Potentiostatic polarization test) 40 Chapter 4 結果與討論 41 4.1 微結構分析 41 4.1.1 表面形貌 41 4.1.2 二次相成分分析 44 4.2 電化學分析 55 4.2.1 循環動電位極化曲線 55 4.2.2 恆電位測試 60 4.3 表面腐蝕形貌分析 62 4.3.1 循環動電位極化曲線後 62 4.3.2 動電位極化曲線後 63 4.4 孔蝕機制推斷 77 Chapter 5 結論 81 Chapter 6 未來工作 82 參考文獻 83 | - |
| dc.language.iso | zh_TW | - |
| dc.subject | 晶出物 | zh_TW |
| dc.subject | A286合金 | zh_TW |
| dc.subject | 循環動電位極化曲線 | zh_TW |
| dc.subject | 動電位極化曲線 | zh_TW |
| dc.subject | 孔蝕 | zh_TW |
| dc.subject | pitting corrosion | en |
| dc.subject | dynamic potential polarization curve | en |
| dc.subject | cyclic dynamic potential polarization curve | en |
| dc.subject | constituent particles | en |
| dc.subject | A286 alloy | en |
| dc.title | 微米級Ti(C, N)對A286超合金腐蝕行為之影響 | zh_TW |
| dc.title | The Effect of Micron-Scale Ti(C, N) on the Corrosion Behavior of A286 Superalloy | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 112-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 蔡文達;林景崎;汪俊延;侯文星 | zh_TW |
| dc.contributor.oralexamcommittee | Wen-Ta Tsai;Jing-Chie Lin;Jyun-Yan Wang;Wen-Hsing Hou | en |
| dc.subject.keyword | A286合金,晶出物,孔蝕,動電位極化曲線,循環動電位極化曲線, | zh_TW |
| dc.subject.keyword | A286 alloy,constituent particles,pitting corrosion,dynamic potential polarization curve,cyclic dynamic potential polarization curve, | en |
| dc.relation.page | 88 | - |
| dc.identifier.doi | 10.6342/NTU202402718 | - |
| dc.rights.note | 未授權 | - |
| dc.date.accepted | 2024-08-07 | - |
| 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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|---|---|---|---|
| ntu-112-2.pdf 未授權公開取用 | 9.9 MB | Adobe PDF |
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