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研究生:蔡旼蒼
研究生(外文):Min-Tsang Tsai
論文名稱:鈷-28鉻-5鉬合金顯微結構分析
論文名稱(外文):Analysis of the Microstructures on the Co-28Cr-5Mo Alloy
指導教授:林宜弘林宜弘引用關係趙志燁趙志燁引用關係
指導教授(外文):Yi-Hong LinChih-Yeh Chao
學位類別:碩士
校院名稱:國立屏東科技大學
系所名稱:機械工程系所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:101
論文頁數:67
中文關鍵詞:鈷鉻鉬合金顯微結構M23C6碳化物疊差
外文關鍵詞:Co-Cr-Mo alloyMicrostructureM23C6 carbideStacking faults
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本文主要探討鈷-28鉻-5鉬合金鑄件,分析合金經不同退火處理之顯微結構,以及合金元素對析出的影響。研究結果,如下所示:合金薄片鑄件,主要為具疊差與雙晶之α鈷(F.C.C)結構,同時存在高鉬團狀析出物與顆粒狀析出物,經電子顯微鏡分析結果,此析出物皆為M23C6碳化物,晶格常數為a=1.056nm。合金1200℃/10小時高溫處理後,可消除顆粒狀析出物,惟仍可觀察到團狀析出物。合金經450~550℃時效處理後,基地為鈷結構,另可觀察到M23C6碳化物於雙晶邊界與基地析出。於650~850℃高溫時效時,M23C6碳化物於基地、雙晶邊界與疊差處析出,晶粒邊界存在α鈷→β鈷(HCP)+ M23C6相變態。β鈷與M23C6方向關係為(111)M23C6//(0001)β、[110]//[112 ̅0] β。研究發現:α鈷/β鈷轉換溫度介於550~650℃,較低於其他學者所觀察之結果。另M23C6碳化物,其[001]擇區繞射圖形中,繞射點強度呈現4種分佈,顯示其結構型態有F.C.C.、L12、鑽石和D85排列。此外,STEM-EDS分析顯示:鉬元素為高溫團狀析出物存在之影響主因,鉻元素為時效析出物形成之影響主因,碳元素將影響α鈷→β鈷(HCP)+ M23C6相變態的過程。此結果,並未被其他學者觀察到。

The purposes of the studies are to investigate the microstructures and effects of alloy elements on the precipitation of as-cast Co-28Cr-5Mo alloy annealed at various temperatures. Some results are described as following: Being heated at 1200℃/10hrs, the microstructure of the alloy is a αCo (FCC) + clustering precipitates structure. After aging at 450~550℃, some M23C6 precipitates could be observed on the twin boundaries and within the matrix. When aged at 650~850℃, some M23C6 precipitates could be observed either on stacking faults or twin boundaries. Moreover, a αCo → βCo (HCP) + M23C6 phase transition was occurred on the boundaries. The orientation relations between the βCo and M23C6 carbide is (111)M23C6//(0001)β, [110]M23C6//[112 ̅0]β. It is noted that the temperature of the αCo/βCo transition is in range of 550~650℃, which being lower than other workers. In addition, the intensity distribution of the reflection spots in [001] SADP divided four types, it implies that the structure of M23C6 carbide is belonging to F.C.C., L12, diamond cubic or D85 structure which of lattice parameter being a=1.056nm. Based on STEM-EDS, the Mo element will play an important role on occurrence of the clustering the precipitates, and of Cr element on the precipitation of M23C6 carbide. Moreover, the carbon element would be major influenced on a αCo → βCo + M23C6 phase transition.
Contents
Abstract...I
摘 要...II
誌 謝...III
Contents...IV
List of Tables...VI
List of Figures...VII
Chapter 1 Introduction...1
Chapter 2 Reviews of the references...3
2.1 Information of the dental...3
2.2 The type of the carbides in the cobalt alloys...3
2.2.1 M3C2 and M7C3 carbides...3
2.2.2 M6C carbides...3
2.2.3 M23C6 carbides...4
2.3 Intermetallic compounds...4
2.4 Effects of the stacking faults...4
Chapter 3 Experimental Procedures...12
3-1 Specimens Preparation...12
3-2 Analysis of Microstructures...12
3-2-1 Scanning Electron Microscopy (SEM)...12
3-2-2 Transmission Electron Microscope (TEM)...12
Chapter 4 Results and Discussion...15
4.1 Microstructure of the raw material...15
4.2 Microstructure of the specimens heated at 1200℃...15
4.3 Microstructure of the specimens aged at various temperatures...16
4.4 Discussion...18
Chapter 5 Conclusions...63
References...65
Brief Introduce of the Author...67

1.A. de J. Saldivar, A. Mani Medrano and A. Salinas Rodriguez: Scrip. Mater., 1999, Vol.40, No6, 717-722
2.A. J. Saldivar-Garcia and H. F. Lopez: Metall. Mater. Trans. A, 2004, Vol. 35A, 2517-2523
3.C. Song, H. Park, H. Seong, and H. F. Lopez: Metall. Mater. Trans. A, 2006, Vol. 37A, 3197-3204
4.C. Lall, M. H. Loretto and I. R. Harris: Acta metall., 1978, Vol. 26, 1631-1641
5.C. Montero-Ocampo, M. Talavera, and H. Lopez: Metall. Mater. Trans. A, 1999, Vol. 30A, 611-620
6.Cobalt Monograph, Cobalt, 1970 , 129-141
7.Chester T. Sims, William C. Hagel: The superallys, 145-173
8.D. J. Lloyd, D. W. Chung and M. C. Chaturvedi: Acta metall., 1975, Vol. 23, 93-100
9.D. W. Chung and M. Chaturvedi and D. J. Lloyd: Acta metall., 1976, Vol. 24, 227-232
10.E. R. Thompson and F. D. Lemkey: Metall. Trans., 1970, Vol. 1, 2799-2806
11.E. R. Thompson, D. A. Koss, and J. C. Chesnutt: Metall. Trans., 1970, Vol. 1, 2807-2813
12.H. F. Lo’ pez and A. J. Saldivar-Garcia: Metall. Mater. Trans. A, 2008, Vol. 39A, 8-18
13.H. J. Goadschmidt, D. Sc., F. Inst. P., F. I. M.: Interstitial Alloys, 88-114
14.H. Minouei, M. H. Fathi, M. Meratin and H. Ghazvinizadeh: Iranian Journal of Materials Science &; Engineering, 2012, Vol. 9, Number 3
15.J. B. Vandersande, J. R. Coke, and J. Wulff: Metall. Trans. A, 1976, Vol. 7A, 389-397
16.Krishna Rajan: Ournal of Mater. Sci. Letters 1, 1982, 482-484
17.Krishna Rajan and John B. Vander Sande: Journal of Metall. Sci. 17, 1982, 769-778
18.Krishna Rajan: Metall. Trans. A, 1982, Vol. 13A, 1161-1166
19.Krishna Rajan: Metall. Trans. A, 1984, Vol. 15A, 1335-1338
20.M. J. Woulds and T. R. Cass: Cobalt, 1969, 3-13
21.N. Cong Dahn, D. Morphy and K. Rajan: Acta metall., 1984, Vol. 32, No. 9, 1317-1322
22.P. Huang and H. F. Lopez: Mater. Sci. Technol., 1999, Vol.15, 157-164
23.P. Huang, A. Salinas-Rodriguez, and H. F. Lopez: Mater. Sci. Technol., 1999, Vol.15, 1324-1330
24.P. Vieira Muterlle, M. Zendron, C. Zanella, M. Perina, R. Bardini, A. Molinari: 2009-01-0020
25.Sang-Hak Lee, Eiji Takahashi, Naoyuki Nomura and Akihiko Chiba: Mater. Trans., Vol. 47, No. 2 (2006) pp. 287-290
26.Shingo Kurosu, Naoyuki Nomura and Akihiko Chiba: Mater. Trans., Vol. 47, No. 8 (2006) pp. 1961-1964
27.William R. Lacefield, JR.: University of Florida, 1981
28.张永刚、韩雅芳、陈国良、郭建亭、万晓景、冯涤: 金属间化合物結構材料,pp.180-299

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