微量鉬與熱處理對Fe-2Ni-0.5C多孔合金微結構及機械性質之影響

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楊文辰(Wen-Chen Ynag) 查詢紙本館藏

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材料科學與工程研究所

論文名稱

微量鉬與熱處理對Fe-2Ni-0.5C多孔合金微結構及機械性質之影響
(Effect of trace Mo and heat treatment on the microstructures and mechanical properties of Fe-2Ni-0.5C metal foams)

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摘要(中)

本研究以無壓式漿料多孔燒結成型技術，成功製備出孔徑、與孔隙率分別為1.8mm、與53%之多孔Fe-2Ni-0.5C(-0.5Mo)合金;藉由微結構分析、與機械性質試驗，探討Mo(0.5wt%)與(回火、深冷)熱處理對微結構和機械性質的影響。結果顯示，針對未含Mo、且經深冷處理之多孔合金，相較於未經深冷處理者，於低溫(250°C)回火時，可析出更多之過渡碳化物(ε/η)，更能有效提升回火的壓縮性質。且在高溫(500°C)回火，其壓縮特性雖較低溫回火為低，但相較於未經深冷處理之多孔合金，其回火球狀雪明碳鐵較為細化、且密集，其壓縮平台應力、與能量吸收值，都明顯高於未經深冷處理之合金約30％。
而經淬火後含Mo之多孔合金，於中溫(400°C)下回火，其微結構仍保有極高硬度之回火麻田散鐵，其抗壓平台應力(817MPa)與單位能量吸收值(114J/g)，均係目前所蒐集之鐵基多孔合金文獻中最高者。且含Mo、相比於未含Mo之多孔合金，在相同的熱處理狀態下，其抗壓平台應力與單位能量吸收值均較高，顯示Mo的添加，可提供較強的壓縮性能。

摘要(英)

This study focuses on the preparation of Fe-2Ni-0.5C(-0.5Mo) metal foams using a pressureless powder space holder technique. The fabricated metal foams exhibited pore size of 1.8mm and a porosity of 53%. Through microstructure analysis and mechanical properties testing, the effects of Mo(0.5wt%) addition and heat treatment (tempering and cryogenic) on the microstructure and mechanical properties were investigated. The results showed that for the porous alloy without Mo and subjected to cryogenic treatment, compared to the untreated samples, a higher amount of transition carbides (ε/η) could precipitate during low-temperature tempering (250°C), leading to improved compressive properties. Additionally, at high-temperature tempering (500°C), although the compressive characteristics were lower than those of low-temperature tempering, the carbide precipitates were finer and denser in the porous alloy with cryogenic treatment compared to the untreated alloy. The compressive plateau stress and energy absorption values were significantly increased by approximately 30% compared to the alloy without cryogenic treatment.
Furthermore, the metal foams containing Mo after quenching exhibited retained high hardness martensite during tempering at intermediate temperature (400°C). The compressive plateau stress (817 MPa) and energy absorption capacity (114 J/g) achieved in this condition were the highest among the collected literature on iron-based metal foams. Moreover, the addition of Mo resulted in higher compressive plateau stress and energy absorption capacity compared to the alloy without Mo under the same heat treatment conditions, indicating that Mo addition enhances the compressive performance.

關鍵字(中)

★ 多孔合金
★ Fe-Ni-C-Mo合金
★ 抗壓平台應力
★ 單位能量吸收
★ 深冷處理

關鍵字(英)

★ metal foams
★ Fe-Ni-C-Mo alloy
★ compressive plateau stress
★ energy absorption capacity
★ cryogenic treatment

論文目次

摘要 iv
Abstract v
謝誌 vi
目錄 viii
圖目錄 xi
表目錄 xv
第一章前言與文獻回顧 1
1.1 前言 1
1.2 多孔金屬簡介 3
1.3 多孔金屬的製備 4
1.3.1 壓力滲透鑄造法 5
1.3.2 熔融發泡鑄造法 6
1.3.3 傳統粉末冶金法 7
1.3.4 無壓式粉末冶金法 8
1.4 多孔金屬之機械性質 9
1.5 多孔金屬抗彈之應用 13
1.6 Fe-2Ni-0.5C(-0.5Mo)低合金鋼簡介 14
1.7 Fe-2Ni-0.5C(-0.5Mo)低合金鋼之熱處理 15
1.8 合金元素對Fe-2Ni-0.5C-(0.5Mo)低合金鋼的影響 16
1.8.1 碳對Fe-2Ni-0.5C-(0.5Mo)低合金鋼的影響 16
1.8.2 鎳對Fe-2Ni-0.5C(-0.5Mo)低合金鋼的影響 17
1.8.3 鉬對Fe-2Ni-0.5C(-0.5Mo)低合金鋼的影響 18
1.9 羰基鐵粉簡介 19
第二章實驗步驟 21
2.1 淬火、深冷、與回火處理 23
2.2 X光繞射分析(X-ray diffraction) 24
2.3 微結構分析與觀察 25
2.3.1 光學顯微鏡(Optical microscopy, OM) 25
2.3.2 掃描式電子顯微鏡(Scanning Electron Microscopy, SEM) 25
2.3.3 電子背向散射繞射(Electron Back-Scattered Diffraction, EBSD) 25
2.3.4 穿透式電子顯微鏡(Transmission Electron Microscopy, TEM) 26
2.3.5 差示掃描量熱法(Differential Scanning Calorimetry, DSC) 26
2.4 硬度試驗 26
2.5 壓縮試驗 27
第三章結果與討論 28
3.1 多孔合金之脫碳反應 28
3.1.1 脫碳反應(脫脂、與去除PS球)及其防治 28
3.1.2 脫碳反應(氫氣氣氛中的燒結之脫碳) 29
3.1.3 業界燒結製程 29
3.2 Fe-2Ni-0.5C多孔合金 32
3.2.1 合金微結構 32
3.2.2 合金EBSD分析 35
3.2.3 合金X光繞射分析 36
3.3 Fe-2Ni-0.5C-0.5Mo多孔合金 37
3.3.1 合金微結構 37
3.3.2 合金X光繞射分析 41
3.4 DSC分析 42
3.5 多孔合金(壓縮)機械性質 43
3.6 多孔合金壓縮性質比較 53
3.7 未來工作(初步成果) 54
第四章結論 56
第五章參考文獻 58

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指導教授

李勝隆(Sheng-Long Lee)

審核日期

2023-7-28

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