本研究主要探討釩含量對雙相不銹鋼鑄件顯微組織與腐蝕特性的影響，以雙相不銹鋼（UNSS32750 和UNS S32760）為原料，分別添加1 wt%、5 wt%和10 wt%的釩鐵合金於真空感應熔煉爐進行熔煉後在爐中凝固。實驗結果顯示，原材顯微組織主要是由肥粒鐵(α)及沃斯田鐵(γ)所組成，而加入1 wt%釩鐵合金後的鑄態組織發現了VCrFe8相，當添加量從5 wt%增加到10 wt%時，其形貌由針狀結構轉變成顆粒或粗塊狀結構，而且透過釩鐵合金量的改變，可以使雙相不銹鋼的結構完全變成肥粒鐵。硬度增加的主導因素為VCrFe8析出強化。電化學腐蝕測試後，隨著釩鐵合金添加量增加，可顯示出更佳的耐腐蝕性。

The effects of vanadium content on the microstructure and corrosion property of as-cast duplex stainless steels were investigated. Duplex stainless steels (UNS S32750 and UNS S32760) with ferro-vanadium alloy additions 1 wt%, 5 wt% and 10 wt% were fabricated by vacuum induction melting then were solidified in furnaces. The results revealed that the microstructure of base materials were mainly composed of ferrite (α) and austenite (γ), however, by addition of 1 wt% ferro-vanadium alloy, the VCrFe8 phase was formed in the as-cast alloys. Furthermore, an increase in ferro-vanadium alloy amount from 5wt.% to 10wt.% resulted in morphological changes from needle-like to particle-like structure or coarse block shapes. By varying the additions of ferro-vanadium alloy, the duplex stainless steels could be made a fully ferritic structure. The increase in hardness was mainly due to VCrFe8 precipitation strengthening. The electrochemical test established that the corrosion resistance of the specimens improved successively with increasing ferro-vanadium alloy content.

摘要...i
Abstract...ii
誌謝...iii
目錄...iv
表目錄...vi
圖目錄...vii
第一章 緒論...1
第二章 文獻回顧...2
2-1不銹鋼介紹...2
2-1-2 不銹鋼命名...3
2-1-3 各系列不銹鋼簡述...4
2-1-4 合金元素對不銹鋼的影響...5
2-2 雙相不銹鋼介紹...8
2-2-1雙相不銹鋼發展歷史...8
2-2-2雙相不銹鋼特性...8
2-2-3雙相不銹鋼種類...11
2-3 UNS S32750與UNS S32760雙相不銹鋼...12
2-3-1 強化機制...12
2-4 電化學腐蝕特性...15
2-4-1電化學腐蝕原理...15
2-4-2極化曲線...15
2-5 真空感應鑄造 18
2-5-1 真空感應鑄造優缺點...19
2-5-3 感應加熱原理...21
2-6 國內外相關研究...23
第三章 實驗方法...27
3-1實驗流程...27
3-2真空感應鑄造...29
3-2-1鑄造參數...29
3-2-2鑄造使用儀器...30
3-3製作試片與顯微組織分析...30
3-3-1製作試片...30
3-3-2顯微組織分析...32
3-4硬度試驗機...33
3-5 SEM及EDS觀察與分析...33
3-6 X光繞射儀...34
3-7電化學極化曲線測試...35
第四章 結果與討論...36
4-1 UNS S32750雙相不銹鋼含釩顯微組織分析...36
4-2 UNS S32760雙相不銹鋼含釩顯微組織分析...36
4-3 SEM/EDS元素組成分析...42
4-3-1 UNS S32750雙相不銹鋼的元素分析...42
4-3-2 UNS S32760雙相不銹鋼的元素分析...43
4-4 XRD結構分析...62
4-5 維氏硬度...64
4-6 電化學極化曲線抗腐蝕測試...66
第五章 結論...74
參考文獻...75
Extended Abstract...78

[1].K. Arun Babu, S. Mandal, C.N. Athreya, B. Shakthipriya and V.S. Sarma, "Hot Deformation Characteristics and Processing Map of a Phosphorous Modified Super Austenitic Stainless Steel", Materials & Design, 2017, 115, pp.262-275.
[2].M. Shamanian, M. Mohammadnezhad, M. Amini, A. Zabolain, J.A. Szpunar, "Electron Backscatter Diffraction Analysis of Joints between AISI 316L Austenitic/UNS S32750 Dual-Phase Stainless Steel", Journal of Materials Engineering and Performance, 2015, 24(8), pp.3118-3128.
[3].K. Vutova, V. Vassileva, E. Koleva, V. Stefanova, D.P. Amalnerkar, "Effects of process parameters on electron beam melting technogenic materials for obtaining rare metals", Journal of Physics: Conference Series, 1089(1), 012013, 2018.
[4].王新、徐成海、張楊，真空鑄造技術的研究現況，全國真空冶金與表面工程學術研討會會議論文集，2004。
[5].R.G. Davies, "The Deformation Behavior of a Vanadium-Strengthened Dual Phase Steel", Metallurgical Transactions, 1978, 9, pp.41–52.
[6].R.O. Adams, "A Review of the Stainless Steel Surface", Journal of Vacuum Science & Technology A, 1983, 1(1), pp.12-18.
[7].吳溪煌、田福助，電化學理論與應用，高立圖書有限公司，台北市，2014。
[8].F. Robert, " Metals Handbook-Atlas of Microstructures of Industrial Alloys", 8th Edn., Vol. 7, Metals Park, Ohio, ASM International, Metals Park, Ohio, 1973.
[9].林亮東，不銹鋼表面以電漿硬面銲覆鎢後之顯微結構特徵研究，國立虎尾科技大學，碩士論文，雲林縣，2016，4-6頁。
[10].劉明德，鎢含量對肥粒鐵型不銹鋼的顯微組織與腐蝕特性之研究，國立虎尾科技大學，碩士論文，雲林縣，2017，4-7頁。
[11].J. Wu, "Duplex Stainless Steel", 1st Edn., Metallurgical Industry Press, Beijing, China, 1999. pp.1-18.
[12].陳鴻賓 譯，不鏽鋼的耐腐蝕性，中國腐蝕工程學報，1997，6，44-60頁。
[13].R.H. Espy, "Weldability of Nitrogen-Strengthened Stainless Steels", Welding Journal's Welding Research Supplement, 1982, 61(5), pp.149s-156s.
[14].Junhe Li, Wei Shen, Ping Lin, Fuming Wang, Zhanbing Yang, "Effect of Solution Treatment Temperature on Microstructural Evolution, Precipitation Behavior, and Comprehensive Properties in UNS S32750 Super Duplex Stainless Steel", Metals, 2020, 10(11), 1481.
[15].David D. S. Silva, Lindolpho S. D. C. Lima, Allan J. M. Araújo, Vinícius D. Silva, Rafael A. Raimundo, Igor Z. Damasceno, Thiago A. Simões, Rodinei M. Gomes, "The Effect of Microstructural Changes on Mechanical and Electrochemical Corrosion Properties of Duplex Stainless Steel Aged for Short Periods", Materials, 2020, 13(23), 5511.
[16].J. Li, Z. Zhang, H. Chen, X. Xiao, J. Zhao, L. Jiang, "New Economical 19Cr Duplex Stainless Steels", Metallurgical and Materials Transactions A, 2012, 43(2), pp.428-436.
[17].Kenneth Göransson, Marie-Louise Nyman, Martin Holmquist, "Extending the Application Range of Super-Duplex Stainless Steels", NACE - International Corrosion Conference Series, Nashville, Tennessee, March 2007.
[18].R, Francis, G. Byrne, G. Warburton, "The Application of Superduplex Stainless Steel in Geothermal Power Plants", NACE - International Corrosion Conference Series, Orlando, Florida, March 2013.
[19].J.R. Scully, "Polarization Resistance Method for Determination of Instantaneous Corrosion Rates", Corrosion, 2000, 56(2), pp.199-218.
[20].W.H. Tsao, H.L. Chung, "Effect of Corrosion rate of Unpainted Structural Steel in Various Degradation Conditions", Journal of China Institute of Technology, 2007, 36, pp.261-271.
[21].D.A. Jones, N.D. Greene, "Electrochemical Measurements of Low Corrosion Rates", Corrosion, 22(7), 1966, pp.198-205.
[22].廖啟民，不銹鋼的沿晶腐蝕和應力腐蝕破壞，防蝕工程，1989，第三卷第一期，4-19頁。
[23].中國冶金百科全書總編輯委員會《鋼鐵冶金》卷編輯委員會、冶金工業出版社《中國冶金百科全書》編輯部，中國冶金百科全書-鋼鐵冶金，2001，696-699頁。
[24].謝仁祥，鈦銅合金的顯微組織與腐蝕特性之研究，國立虎尾科技大學，碩士論文，雲林縣，2016，12-15頁。
[25].A. Choudhury, H. Kemmer, “Vacuum Induction Melting (VIM)”, Metals Handbook, 9th Edn., Vol. 15, Metals Park, Ohio, ASM International, 1988.
[26].C.J. Park, M.K. Ahn, H.S. Kwon, "Influences of Mo Substitution by W on the Precipitation Kinetics of Secondary Phases and the Associated Localized Corrosion and Embrittlement in 29% Cr Ferritic Stainless Steels", Materials Science and Engineering, 2006, 418(1-2), pp.211-217.
[27].V. D. Cojocaru, N. Șerban, M. Lucia Angelescu, M.C. Cotruț, E.M. Cojocaru, A.N. Vintilă, "Influence of Solution Treatment Temperature on Microstructural Properties of an Industrially Forged UNS S32750/1.4410/F53 Super Duplex Stainless Steel (SDSS) Alloy", Metals, 2017, 7(6,), 210.
[28].S. Jin, C.M. Liu, X. Lin, M.J. Li, H.B. Cao, H.Z. Wang, "Effect of Inorganic Anions on the Corrosion Behavior of UNS S32750 Duplex Stainless Steel in Chloride Solution", Materials and Corrosion, 2015, 66(10), pp.1077-1083.
[29].Felipe M.F. Serafim, Wahab O. Alabi, Ikechukwuka N.A. Oguocha, Akindele G. Odeshi, Richard Evitts, Regan J. Gerspacher, Enyinnaya G. Ohaeri, "Stress Corrosion Cracking Behavior of Selected Stainless Steels in Saturated Potash Brine Solution at Different Temperatures", Corrosion Science, 2021, 178, 19025.
[30].K. He and D.V. Edmonds, "Formation of Acicular Ferrite and Influence of Vanadium Alloying", Materials Science and Technology, 2002, 18 (3), pp.289-296.
[31].C. Chen, F.C. Zhanga, Z.N. Yang, C.L. Zheng, "Superhardenability Behavior of Vanadium in 40CrNiMoV Steel", Materials & Design, 2015, 83(15), pp.422-430.
[32].吳溪煌、田福助，電化學理論與應用，高立圖書有限公司，台北市，2014。
[33].T. Zhou, Y. Xiong, Y. Yue, Y. Lu, Y.N. Chen, T.T. He, F.Z. Ren, H. Singh, J. Kömi, M. Huttula, W. Cao, "Controlled Cold Rolling Effect on Microstructure and Mechanical Properties of Ce-Modified SAF 2507 Super Duplex Stainless Steel", Materials Science & Engineering A, 2019, 766, 138352.
[34].A.D. Halimi, Sulistijono, M.I.P. Hidayat, "Microstructural Characterization of Super Duplex Stainless Steel UNS S32760 after Heat Treatment in Different Cooling Media", AIP Conference Proceedings, 2020, 2296(1), 020077.
[35].Y. Ma, X. Li, Y. Liu, S. Zhou, X. Dang, "Microstructure and Properties of Ti–Nb–V–Mo-Alloyed High Chromium Cast Iron", Bulletin of Materials Science, 2013, 36(5), pp.839-844.
[36].D.D. Damm, A. Contin, V.J. Trava-Airoldi, G. de Vasconcelos, D.M. Barquete, E.J. Corat, "Synthesis of Vanadium Interface for HFCVD Diamond Deposition on Steel Surface", Materials Research, 2017, 20(2), pp.248-253.
[37].M. Tarakci, Y. Gencer, A. Calik, "The Pack-Boronizing of Pure Vanadium under a Controlled Atmosphere", Applied Surface Science, 2010, 256(24), pp.7612-7618.
[38].J. He, M. Yan, L. Yang, M. Masoumeh, Z. Song, Y. Jiang, "Electrochemical Corrosion and Critical Pitting Temperature of S32750 Super Duplex Stainless Steel in NaCl Solution", Journal of Chinese Society for Corrosion and Protection, 2015, 35(2), pp.106-112.