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題 名 | 錸元素對細晶鎳基超合金晶界強度及982℃/200 MPa高溫潛變性能之影響=Influence of Rhenium Addition on the Grain Boundary Strength and 982 ℃/200 MPa Creep Properties of Fine-grain Nickel-Base Superalloy |
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作 者 | 廖健鴻; 薄慧雲; 魏肇男; 倪國裕; 朝春光; 劉增豐; 鄭文興; | 書刊名 | 鑄造工程學刊 |
卷 期 | 38:2=153 2012.06[民101.06] |
頁 次 | 頁7-17 |
分類號 | 472.9 |
關鍵詞 | 超合金; 錸; 細晶; 晶界強度; 潛變; Superalloy; Rhenium; Fine grain; Grain boundary strength; Creep; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究以Mar-M247鎳基超合金為素材,添加0-5 wt.%不同含量的錸元素於Mar-M247中,研究錸元素對Mar-M247細晶超合金晶界強度及982 ℃/200 MPa高溫潛變性能之影響。研究結果顯示隨著錸在Mar-M247中含量之增加,同時具有晶界碳化物細化及晶界碳化物線密度增加之效果,因此可使晶界強化。根據982 ℃/200 MPa潛變測試結果得知,潛變壽命會隨著錸含量之增加而延長,至錸含量為3 wt.%時達到最大值。錸的添加會延長穩態潛變階段之時間,延緩潛變進入加速潛變階段,其原因是:(1)最佳化形貎γ′相(一次立方體γ′相)數量的增加、強化γ基地強度及促進γ′竹筏狀發展等三因素。另錸的添加會促進晶界碳化物的細化及數量增加,阻止裂縫沿著晶界成長,延長第三階段潛變的時間。綜上因素,添加1-3 wt.%錸,會使潛變壽命增加。然而添加5 wt.%過量的錸,會因P相的形成造成潛變性能的下降。 |
英文摘要 | The influence of Re on the grain boundary (GB) strength and 982 ℃/200 MPa creep properties of fine-grain Mar-M247superalloy was investigated. Quantitative statistical analysis showed that an increase of Re content in Mar-M247 resulted in a decrease of the size, and an increase in the number of GB carbides. The GB strength increased with increasing the number of fine GB carbides. The results of 982 ℃/200 MPa creep tests showed that creep life increase with an increase in Re content up to a maximum at 3 wt.%. The addition of 1-3 wt.% Re reduced steady-state creep rates and postponed the onset of the acceleration stage in three ways: (1) by increasing the amount of primary cuboidal γ′ phase; (2) by increasing the strength of γ matrix; and (3) by increasing the development of γ′ raft. It also prolonged the duration of the accelerating creep stage by refinement and an increase in the number of GB carbides. The above mentioned factors resulted in a prolongation of creep life. However, addition of greater amounts of Re, such as 5 wt.% Re, causes deterioration of the creep properties due to the formation of P phases. |
本系統中英文摘要資訊取自各篇刊載內容。