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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 黃坤祥 | |
dc.contributor.author | Chia-Chi Li | en |
dc.contributor.author | 李家齊 | zh_TW |
dc.date.accessioned | 2021-06-12T17:54:04Z | - |
dc.date.available | 2009-02-18 | |
dc.date.copyright | 2008-02-18 | |
dc.date.issued | 2008 | |
dc.date.submitted | 2008-02-05 | |
dc.identifier.citation | 第六章:參考文獻
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Wronski, “Industrial Processing, Microstructures and Mechanical Properties of Fe-(2-4)Mn-0.85Mo- (0.3-0.7)C Sintered Steels”, Powder Metallurgy, 2004, Vol. 47, No. 2, pp 181-190. [35] M. Youseffi, S. C. Mitchell, A. S. Wronski, and A. Cias, “Sintering, Microstructure, and Mechanical Properties of PM Manganese-Molybdenum Steels”, Powder Metallurgy, 2000, Vol. 43, No. 4, pp. 353-358. [36] N. Candela, F. Velasco, M. A. Martinez, and J. M. Torralba, “Influence of Microstructure on Mechanical Properties of Molybdenum Alloyed P/M Steels”, Journal of Materials Processing Technology, 2005, Vol. 168, pp. 505-510. [37] S. Unami and K. Hayashi, “Effect of Sintering Conditions and Mo Addition on Sintering Densification of Fe Coarse Powder”, Journal of the Japan Society of Powder and Powder Metallurgy, 1997, Vol. 44, No. 8, pp. 765-769. [38] Md. Hamiuddin, “Role of Molybdenum in Sintered Steels,” Powder Metallurgy International, 1983, Vol. 15, No. 3, pp. 147-150. [39] H. Danninger, “Sintering of Mo Alloyed P/M Steels Prepared from Elemental Powders (Sintering Temperature and Mechanical Properties)”, Powder Metallurgy International, 1992, Vol. 24, No. 2, pp. 73-79. [40] A. L. Sozinov and V. G. Gavrilijuk, “Estimation of Interaction Energies Me-(C, N) in F. C. C. Iron-Based Alloys Using Thermo-Calc Thermodynamic Database”, Scripta Materialia, 1999, Vol. 41, No. 6, pp. 679-683. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/27025 | - |
dc.description.abstract | 粉末冶金(Powder Metallurgy)及金屬射出成形(Metal Injection Molding, MIM)製程產品在工業界有相當的競爭力,因其具有多種優勢,如:多孔性、可製作高熔點金屬、製作具複雜形狀產品及低成本。在鐵系材料中,常添加碳以及合金元素,是改善其機械性質最普遍的方法,其中碳含量最重要,它與材料的強度、硬度和延性息息相關。所以若能有效的控制以及找出對材料性能最佳的碳含量,是重要的課題。在前人的研究指出,燒結時氣氛、流量以及添加的合金元素皆會改變碳含量以及組織均勻性。此外,由於鎳也是粉末冶金中常添加的元素,它能有效提升材料密度、強度及延性,但是卻容易造成含碳基材的組織不均勻性,所以希望藉由此實驗能了解並改善此問題。
結果顯示,以MIM製成的Fe-1.75Ni-0.5Mo-0.5C合金鋼(MPIF-4605合金鋼)中,在N2-H2混合氣體下燒結時隨著氫含量之增加碳含量能維持穩定,直至氫含量超過40%才急速降低,而高流量氣氛下燒結的工件雖然得到較高的密度,但材料強度、硬度及碳含量皆比較差。 在碳含量在0.6~0.8wt%、鎳含量8wt%時,能得到較好的硬度,但是鎳與碳有排斥效應,且鎳含量過高時,會使得材料中的碳在升溫時無法固溶到基地中,造成碳聚集的現象。若添加1.5wt%鉻在合金系統中可使鎳的擴散更均勻,主要是因為鉻降低了合金系統中鎳與碳的化勢,使鎳及碳能更均勻的分散在組織中,增強材料的機械性質。 | zh_TW |
dc.description.abstract | Powder metallurgy (PM) process has been used widely in the industry due to its capability of making net shape products economically. Similar to most wrought steels, carbon is the most important alloying element for PM steels and is usually added in the graphite powder form. The graphite powders are homogenized during sintering. Previous studies have shown that the composition and flow rate of the atmosphere and the alloying elements are critical in determining the final amount of the dissolved carbon. These effects are further investigated in this study.
The results show that the highest carbon content of Fe-1.75Ni-0.5Mo-0.5C (MPIF-4605 alloy) steel is obtained using a N2-40H2 atmosphere with a low flow rate. When the amount of Ni increases, the distribution of C becomes less uniform. This is because C and Ni have a repulsion effect as is demonstrated by the carburization and Ni coating experiments. As the Ni content increases to 15% and above, the repulsion effect becomes so strong that graphite phase forms. To improve the C and Ni distribution, the addition of 1.5wt% Cr was shown to be beneficial and the mechanical properties were enhanced. These experimental results are supported by the Thermo-Calc program analysis. | en |
dc.description.provenance | Made available in DSpace on 2021-06-12T17:54:04Z (GMT). No. of bitstreams: 1 ntu-97-R94527022-1.pdf: 14136456 bytes, checksum: a5f79fe619d2c126dfd965263ca6c4b7 (MD5) Previous issue date: 2008 | en |
dc.description.tableofcontents | 誌謝………………………………………………………………………………….…II
Abstract………………………………………………………………………………..III 摘要…………………………………………………………………………………..IV 目錄 V 圖目錄 VII 表目錄 XIII 第一章:文獻回顧 1 1-1 碳含量的控制 1 1-1-1 脫脂 2 1-1-2 燒結 2 1-2:碳的影響 2 1-3:氧的影響 3 1-4:鎳的影響 4 1-4-1:鎳對燒結體的影響 4 1-4-2:鎳對機械性質的影響 5 1-5 鉻的影響 6 1-6 鉬的影響 10 第二章:實 驗 14 2-1:實驗設計 14 2-2:原料 14 2-2-1:基礎粉 14 2-2-2:黏結劑 22 2-3:混合方式及混煉 22 2-4 成形 23 2-5 脫脂 23 2-5-1 溶劑脫脂 23 2-5-2 熱脫脂 24 2-6 燒結 24 2-7 性質測試 24 2-7-1 燒結行為之觀察 24 2-7-2 碳含量的量測 25 2-7-3 氧含量的測量 26 2-7-4 燒結密度的測量 27 2-7-5 金相製備 27 2-7-6 硬度的測試 27 2-7-7 尺寸穩定性的評估 27 2-8 熱力學模擬計算 28 2-9 鎳與碳的擴散偶實驗 28 2-10 測試儀器 29 第三章:結果與討論 30 3-1 不同氣氛及流量對於4605合金鋼的影響 30 3-2 碳含量對密度、收縮率的影響 34 3-3 合金元素對碳的影響 39 3-3-1 粉末冶金鋼中常見的添加元素 39 3-3-2 以Thermo-Calc計算鎳、碳、鉻在合金鋼中的化勢 39 3-3-3 碳鎳的排斥效應 41 3-3-4 滲碳處理 44 3-3-5 鎳擴散偶實驗 46 3-3-6 添加鉻元素對於碳鎳排斥效應的影響 50 3-4 不同鎳含量對於OS鐵粉的影響 58 3-4-1 鎳含量對含碳基材組織變化之影響 60 3-4-2 鎳含量對不同基礎粉末的影響 64 第四章:結 論 73 第五章:未來工作…………………………………………………………………..73 第六章:參考文獻 74 | |
dc.language.iso | zh-TW | |
dc.title | 燒結氣氛及合金元素對粉末冶金鋼碳含量之影響 | zh_TW |
dc.title | Effects of Atmosphere and Alloying Element on the Carbon Content in Sintered PM Steels | en |
dc.type | Thesis | |
dc.date.schoolyear | 96-1 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 連雙喜,林招松 | |
dc.subject.keyword | 粉末冶金,碳,鎳,燒結氣氛,均質化, | zh_TW |
dc.subject.keyword | powder metallurgy,carbon,nickel,sintering atmosphere,homogenization, | en |
dc.relation.page | 0 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2008-02-05 | |
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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