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題名 | 鑄造用Mar-M247超合金多晶與單晶顯微結構及機械性能研究=The Study on Microstructures and Mechanical Properties of Polycrystal and Single Crystal Cast Mar-M247 Superalloy |
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作者 | 薄慧雲; 朝春光; 馬堅勇; 陳俊雄; 林於隆; | 書刊名 | 鑄工 |
卷期 | 24:2=97 1998.06[民87.06] |
頁次 | 頁30-43 |
分類號 | 472.2 |
關鍵詞 | Mar-M247超合金; 潛變; 延伸率; Mar-M247 superalloy; Creep; Elongation; |
語文 | 中文(Chinese) |
中文摘要 | 超合金的研究與航太工業的發展一直是息息相關, 而超合金單晶的技術更是提昇 引擎效率和性能的主因之一。本研究主要目的在探討鑄造用鎳基超合金 Mar-M247 單晶及多 晶之室溫拉伸、889 ℃高溫拉伸及 760 ℃ /735MPa 潛變性質之差異及其高溫脆性破壞的分 析。 研究結果顯示 Mar-M247 超合金單晶與多晶室溫及 899 ℃高溫之拉伸降伏及抗拉強度 相近, 但單晶之破斷延伸率則遠大於多晶(室溫單晶約為多晶之 2-3 倍,899 ℃約為多晶 之 4 倍)。 而在 760 ℃ /735MPa 潛變測試條件下,單晶之潛變壽命及破斷延伸率均遠大 於多晶(潛變壽命單晶約為多晶 7 倍,延伸率為多晶 8-10 倍之多), 且單晶具有顯著的 第三階段潛變塑性區,多晶僅至第二階段即發生斷裂,但單晶及多晶的穩態潛變速率則相近 。由破斷面觀察顯示多晶 Mar-M247 的破裂模式為沿晶脆性斷裂,而單晶則屬於延性的破裂 模式,此結果表示晶界的存在是拉伸破斷延伸率及潛變破斷壽命與延伸率下降的主要因素。 而如何強化及韌化 Mar-M247 超合金的晶界, 增加該合金的高溫穩定性與安全性是 Mar-M247 超合金發展的重點。 |
英文摘要 | The study of superalloys and their processing has extensively correlated to the development of aerospace industry. The technology of single crystal in superalloy is regarded as a crucial factor for the promotion of the engine efficiency and performance. The objectives of this paper are to study the room temperature and 899 ℃ tensile and 760 ℃ /735 MPa creep properties of single crystal and polycrystal cast Mar-M247 superalloy, and to explore the factors responsible for its hgh temperature brittleness. The present results show that the yield and tensile strength of single crystal are identical to those of polycrystal at both room temperature and 899 ℃. However, elongation of single crystal is apparently greater than polycrystal (room temperature elongation of single crystal is 2 to 3 times greater, and about 4 times at 899 ℃ ). Creep life and rupture elongation of single crystal tested under 760 ℃ /735MPa are larger than polycrystal (creep life of single crystal is 7 times larger than polycrystal, elongation is 8 to 10 times greater). Single crystal has an obvious 3-stage creepprocedure, however, polycrystal is fractured during 2nd stage of creep. Steady state creep rate in single crystal is approximately same with the polycrystal. The results of fractogaphic analysis show that the fracture mode of polycrystal is a typical intergranular fracture, and the fracture origination at grain boundary is the controlling factor leading to lower creep life and elongation. Efforts associated with enhancing the strength and ductility of grain boundary in Mar-M247 superalloy should be made to improve the reliability and safety of Mar-M247 superalloy operated at high temperature. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。