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題 名 | 微細鑄造及殼式離心鑄造對IN-713LC超合金顯微組織及機械性能影響之研究=A Study on the Effect of Microcast and Skull Centrifugal Cast on Microstructure and Mechanical Properties of IN-713LC Superalloy |
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作 者 | 魏肇男; 薄慧雲; 洪炎輝; 廖健鴻; 鄭榮瑞; 朝春光; 馬堅勇; | 書刊名 | 鑄造工程學刊 |
卷 期 | 31:3=126 民94.09 |
頁 次 | 頁1-18 |
分類號 | 472.2 |
關鍵詞 | 超合金; 細晶; 微細鑄造; 離心鑄造; 熱均壓; Superalloy; Fine-grain; Microcast; Centrifugal cast; Hot isostatic pressing; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究以IN-713LC超合金為素材,採用微細鑄造(Microscast)及殼式離心鑄造(Skull Centrifugal Cast)製程,鑄造出超微細晶試桿,並進行熱均壓處理,研究微細鑄造及離心鑄造對IN-713LC顯微組織及機械性能之影響。研究結果顯示:微細鑄造及離心鑄造具有細化晶粒的效果,可得到晶粒大小為65μm及25μm之超徵細晶。顯微組織觀察顯示,隨著晶粒之細化,碳化物具有被細化及球化之趨勢。此外,熱均壓處理可消除微縮孔及提昇機械性能,使離心鑄造25μm超微細晶試桿微縮孔由7.7%降至0.8%,有效提升抗拉強度至1328MPa(為傳統鑄造之1.2倍),具伸長率大幅提昇至18.1%(為傳統鑄造之1.9倍)。在927℃/158MPa潛變測試下,離心鑄造所得的25μm超微細晶,因骨架型碳化物被細化成顆粒狀且均勻分佈,其潛變壽命較微細鑄造所得的90μm細晶優異。本研究證實微細鑄造及離心鑄造可有效提高超合金之機械性能,熱均壓處理可有效減少微縮孔對細晶鑄件機械性質之負面影響。 |
英文摘要 | The IN-713LC superalloy employed in this study was prepared by microcast and skull centrifugal cast preocesses, and then cast as standard test bars with different grain size. The bars were followed by HIP treatment. Thus, the effects of microcast and centrifugal cast on microstructures and mechanical properties of IN-713LC superalloy were investigated. The results showed that the microcast and centrifugal cast processes have refined the grain size of the test bars and the grain size of the fine grain were about 65μm and 25μm by microcast and centrifugal cast, respectively. From the microstructue observing results, it is known that the carbides morphology is refined and spheroidized, when the grain sizes of test bars are refined. Besides, HIP treatment eliminated micro-shrinkage porosity in the castings and improved mechanical behavior. After the test bars treated by HIP, the area fraction of microporosities in the centrifugal cast fine grain specimen could be eliminated from 7.7% to 0.8%. The tensile strength and the elongation also increased to 1328 MPa and 18.1% after HIP. For a creep-tested under 927℃/158 MPa, the creep life for the ultra-fine grain specimen (25μm), obtained by centrifugal cast was higher than that the fine grain specimen (90μm) obtained by microcast process. In this study, the mechanical properties of the IN-713LC superalloy were significantly improved by microcast and centrifugal cast process. Besides, the HIP procedure could eliminate the detrimental effects on mechanical properties of microshrinkage porosity in the fine-grain castings. |
本系統中英文摘要資訊取自各篇刊載內容。