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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 顧鈞豪 | |
dc.contributor.author | I-Chen Huang | en |
dc.contributor.author | 黃一晨 | zh_TW |
dc.date.accessioned | 2021-06-13T16:42:21Z | - |
dc.date.available | 2005-07-11 | |
dc.date.copyright | 2005-07-11 | |
dc.date.issued | 2005 | |
dc.date.submitted | 2005-07-01 | |
dc.identifier.citation | Aerospace Structural Metal hand book, CODE 4103.
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O.B. Armida* and J.F. Radavich, 'A Current T-T-T Diagram fro Wrought Alloy 718', Superalloy 718, 625 and Various Derivatives Edited by E.A. Loria, TMS, 1991, p.325. L.A. James, “Fatigue-Crack Growth in Inconel 718 Weldments at Elevated Tempertature”, Weld. J., 57, No.1, 1978, p.17-s. 楊春欽, 張薰圭, “Inconel 718 氬銲與熱處理特性研究”, 1985. R. Thamburaj, W. Wallace, J.A. Goldak, 'Post-Weld Heat-Treatment Cracking in Superalloys', International Metals Reviews, Vol.28, No.1, 1983, p1. R. Vincent, 'Precipitation Around Welds In The Nickel-Base Superalloy, Inconel 718', Acta metall., Vol.33, No.7, 1985, p.1205. J. Gordine, 'Welding of Inconel 718', Weld. J., 49, No.11, 1970, p.531-s. J. Gordine, “Some Problems in Welding Inconel 718”, Weld. J., Nov, 1970, p.480-s. D.A. Porter, K.E. Easterling, “Phase Transformations in Metals and Alloys”, second edition, Chapman & Hall, 1992, p.237. S.A. David, J.M. Vitek, S.S. Babu, L.A. Boatner, R.W. 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Radavich, 'Microstructural Characterization Of Cast 718', Superalloy 718, 625-Metallurgy and Applications Edited by E.A. Loria, TMS, 1989, p.79. W.J. Mills, 'Fracture Toughness Variations For Alloy 718 Base Metal And Weld', Superalloy 718-Metallurgy and Applications Edited by E.A. Loria, TMS, 1989, p.517. J.M. Oblak, D.F. Paulonis, D.S. Duvall, “Coherency Strengthening in Ni Base Alloys Hardened by DO22 γ' Precipitates”, Metall. Trans., Vol.5, 1974, p.143. D. Hull, D.J. Bacon, “Introduction to Dislocations”, fourth edition, Butterworth-Heinemann publications, 2001, P.121. S.D. Antolovich, “The Effect of Metallurgical Instabilities on The Behavior of In 718”, Superalloy 718-Metallurgy and Applications Edited by E.A. Loria, 1989, TMS, p.647. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/38694 | - |
dc.description.abstract | Inconel-718鎳基超合金擁有良好的高溫強度、耐高溫腐蝕等優異性質,並可提供優良的鑄造性、加工性及銲接性。使用Inconel 718製作航太結構體及零組件,當工件完成時,原材會經過反覆熱處理,而銲道會經過鏟修、反覆銲接與熱處理之製程。本研究在於建立不同熱處理條件及反覆銲接與熱處理之製程,對於718合金原材及銲接處之顯微結構與機械性質之影響,並探討其破壞原因是否與原材受到反覆熱處理或是反覆銲接之製程有關。
實驗結果顯示,對於母材而言,980℃固溶與720/620℃雙時效處理,可得到最高之常溫拉伸強度,但是衝擊韌性相當差,且反覆熱處理之製程會使強度大幅變化;1065℃固溶與760/650℃雙時效熱處理則有較好之強度、伸長率與韌性之組合。並且發現因為鏟修銲道而多進行一次固溶處理對於原材之機械性質並不會有顯著影響。 對於銲件而言不論使用980℃或是1065℃之固溶溫度,都無法完全將Laves相消除,因而造成銲件之衝擊韌性較差,使得經過銲後熱處理後之材料,破斷處均發生在銲道。但是經過銲後熱處理後以980℃固溶與720/620℃雙時效熱處理後之試片常溫強度大幅提高,但是高溫強度則是以1065℃固溶與760/650℃雙時效熱處理效果最好。同時可以發現,反覆銲接之製程對於銲件之機械性質沒有顯著影響,此並非造成銲件解體或破壞之主要原因。 若在實際之高溫環境(704℃)下使用,銲後進行1065℃固溶→720℃、620℃雙時效處理或銲後進行1065℃固溶→760℃、650℃雙時效處理所得之機械性質較佳,銲後進行1065℃固溶→720℃、620℃雙時效處理有較高之強度而銲後進行1065℃固溶→760℃、650℃雙時效處理有較好的伸長率,因此可依實際使用之需求來選擇適當之銲後熱處理條件。 | zh_TW |
dc.description.abstract | The Inconel 718, a nickel-based superalloy with its high strength and high corrosion resistance at elevated temperature, becomes a popular superalloy for high temperature application in the past decades. It has good castability, workability, and weldability. Therefore, Inconel 718 has been widely used to produce aero-parts and as structural material. In practical manufacturing, the base metal and welded parts must conduct cyclic heat treatments and repeat welding, respectively. The effects of a series of different and cyclic heat treatments after the welding processes on the microstructure and mechanical properties of 718 alloy have been throughly investigated in this study.
Experimental results show that the base metal conducting the solid solution treatment at 980℃ and double ageing-treatment at 720/620℃ would have the highest tensile strength at room temperature. However, this heat-treatment would significantly change the strength and deteriorate the impact toughness of the weldment. Additionally, the solid solution treatment at 1065℃ and double ageing treatment at 760/650℃ would enhance the strength, elongation, and toughness of the weldment. Because solid solution treatment at 980℃ and 1065℃ can not dissolve all the Laves phase in the weld pool, the weldments have low impact toughness. After post weld heat treatment, the weldments would fracture in the area of weld pool. Weldments would have the highest tensile strength at room temperature after solid solution treatment at 980℃ and double ageing treatment at 720/620℃. Additionally, after the solid solution treatment at 1065℃ and double ageing treatment at 760/650℃, the weldments would have the highest high-temperature tensile strength. According to the similar results of mechanical test, the repeated welding is not the primary reason causing the fracture. The weldments conducting post weld heat treatments of H8 (solid solution treatment at 1065℃ and double ageing treatment at 720/620℃) and H9 (solid solution treatment at 1065℃ and double ageing treatment at 760/650℃) have better mechanical properties at 704℃. Procedure of both post weld heat treatments are recommended since the weldments conducted heat treatment of H8 and H9 have better strength and elongation, respectively. The opportunity of heat treatments depends on the actual situation. | en |
dc.description.provenance | Made available in DSpace on 2021-06-13T16:42:21Z (GMT). No. of bitstreams: 1 ntu-94-R92527016-1.pdf: 15984086 bytes, checksum: 9cd811e6281da99b41dcdc94671b8b5a (MD5) Previous issue date: 2005 | en |
dc.description.tableofcontents | 摘要 i
Abstract iii 目錄 I 圖目錄 III 表目錄 VIII 第一章 前言 1 第二章 文獻回顧 2 2-1 Inconel-718 超合金之特性及合金元素之影響 2 2-2 Inconel-718 之析出相 5 2-3 Inconel-718 之熱處理 11 2-4 Inconel-718 之銲接特性 13 2-5 GTAW(Gas Tungsten Arc Welding)之原理 16 第三章 實驗步驟及方法 20 3-1 實驗流程圖 20 3-2 試片之準備步驟 22 3-2-1 原材試驗之準備步驟 22 3-2-2 銲接試驗之準備步驟 22 3-3 銲接參數之設定 29 3-4 機械性質測試 30 3-5 顯微結構觀察 30 3-6 化學組成份析 30 第四章 結果與討論 31 4-1 原材與經過各種熱處理後之性質 31 4-1-1 顯微結構觀察及成份分析 33 4-1-2 熱處理對原材機械性質之影響 50 4-1-2-1 常溫拉伸試驗與硬度測試結果 50 4-1-2-2 拉伸破斷面組織觀察 60 4-1-2-3 衝擊試驗結果 67 4-2 銲件與經過各種熱處理後之性質 72 4-2-1 顯微結構觀察及成份分析 73 4-2-2 銲後熱處理對銲件機械性質之影響 83 4-2-2-1 常溫拉伸試驗及破斷面觀察 83 4-2-2-2 高溫拉伸試驗及破斷面觀察 89 4-2-2-3 硬度測試結果 100 4-2-2-4 衝擊試驗結果 102 第五章 結論 104 參考文獻 106 | |
dc.language.iso | zh-TW | |
dc.title | 反覆銲接與熱處理對Inconel 718鎳基超合金機械性質之研究 | zh_TW |
dc.title | The effects of cyclic welding and heat treatments on the microstrucrure and mechanical properties of Inconel 718. | en |
dc.type | Thesis | |
dc.date.schoolyear | 93-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 林招松,蔡顯榮 | |
dc.subject.keyword | 氬銲,鎳基超合金,熱處理,顯微結構, | zh_TW |
dc.subject.keyword | TIG,GTAW,superalloy,Inconel 718,heat treatment,microstructure, | en |
dc.relation.page | 112 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2005-07-01 | |
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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