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研究生： 程家甫
論文名稱： 添加矽於含γ′相鈷基超合金之設計
Designing Si bearing Co-base superalloys containing γ′ phases
指導教授： 張士欽
口試委員: 葉安洲
張雲開
學位類別： 碩士
Master
系所名稱： 工學院 - 材料科學工程學系
Materials Science and Engineering
論文出版年： 2014
畢業學年度： 102
語文別： 英文
論文頁數： 96
中文關鍵詞： 鈷基超合金 、γ′強化相 、矽添加 、高溫氧化 、元素分布傾向
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    • 本研究的合金系統為一含γ′強化相的鈷基超合金(Co-Al-W-Ni)系統，此合金目前面臨的主要問題之一是較差的抗氧化性，其原因為，為了穩定γ′強化相，合金中的鉻(Cr)含量需保持在某一定低值的含量，使得含γ′強化相的鈷基超合無法因鉻來達到提升合金的抗氧化性。因此，為了同時穩定γ′強化相與提升合金的抗氧化性，本研究藉由添加矽(Si)來達成此目的，並且探討不同含量的矽對此合金性質的影響，包含真空融煉鑄造凝固後的元素分布、基底相(γ)與γ′強化相的微結構、γ與γ′相間的元素分布傾向、室溫與高溫硬度、高溫熱腐蝕和高溫氧化。實驗結果顯示，矽的添加可以降低合金在高溫的氧化增重、提升合金的抗熱腐蝕性和增加γ′相的相體積百分率，進而增強合金在高溫的硬度。根據實驗結果，添加矽對於提升此鈷基超合金的高溫性質，具有顯著的成效。

    In this study, we have investigated the possibility of using advanced Co-base superalloys with γ/γ′ microstructures to replace Ni-base superalloys. However, in order to maintain the thermal stability of γ′ phase in the Co-base superalloys, the content of Cr has to be reduced to a low level, but the reduction of Cr will result in a decrease in oxidation resistance. Therefore, we propose to use Si addition in the Co-base superalloys based on Co-Al-W-Ni system to maintain oxidation resistance. The solidification profiles, γ/γ′ microstructure, solid-solid partitioning, room/high temperature hardness, hot corrosion and oxidation behavior of different Si bearing systems have been examined. Our results show that, by the addition of Si: (1) The oxidation weight gains of the alloys are lowed; (2) The hot corrosion resistances of the alloys are improved; and (3) The fraction of γ′ phase increases, leading to an improvement in the degree of hardness in high temperature. These findings indicate that the addition of Si offers a potential to improve the properties of Co-base superalloys in high temperature.

    摘要 I Abstract II 致謝 III Contents IV List of Figures VII List of Tables XII 1. Introduction 1 1-1 Background 1 1-2 Motivations and Goals 5 2. Literature Review 10 2-1 Recent Development on High Temperature Materials 10 2-2 Alloy Effect 14 2-2-1 Traditional high Cr content Co-base alloys 14 2-2-2 Recent γ′ bearing Co-base alloys 16 (1) γ′ solvus temperature 16 (2) Secondary phases 17 (3) Partitioning behaviors of alloying elements 18 (4) Creep resistance and strength 21 (5) Lattice misfit 22 (6) Oxidation 24 (7) Effect of Si addition 27 2-3 Processing 28 2-3-1 Heat treatment 28 2-3-2 Solidification 30 3. Experimental 31 3-1 Alloy Design 31 3-2 Materials Preparation 35 3-3 Experimental Procedure 35 3-4 Differential Thermal Analyzer (DTA) 37 3-5 Differential Scanning Calorimetry (DSC) 37 3-6 X-ray Diffractometer (XRD) 37 3-7 Optical Metallography (OM) 38 3-8 Scanning Electron Microscopy (SEM) 38 3-9 Electron Probe Microanalyzer (EPMA) 38 3-10 Determining Constrained Lattice Misfit in Room Temperature 39 3-11 Determining Elemental Partitioning Coefficient 39 3-12 Oxidation Test 39 3-13 Room Temperature Hardness Test 40 3-14 High Temperature Hardness Test 40 3-15 Hot Corrosion Test 41 4. Results and Discussion 42 4-1 As-cast 42 4-1-1 Microstructure 42 4-1-2 Solid-liquid partitioning 48 4-2 The Thermal Properties 50 4-3 Solution Heat Treatment and Ageing Heat Treatments 54 4-3-1 Microstructure 54 4-3-2 Solid-solid partitioning 62 4-3-3 Constrained lattice misfit in room temperature. 65 4-4 High Temperature Oxidation 67 4-4-1 900℃ 67 4-4-2 1000℃ 72 4-4-3 1150℃ 78 4-5 Hardness Tests 82 4-6 Hot Corrosion Tests 85 Conclusions 88 Future Work 90 References 91

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