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頁籤選單縮合
題名 | On the Decomposition of Austenite in Steels=沃斯田鐵分解行為之回顧 |
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作 者 | 張柳春; | 書刊名 | 材料科學 |
卷期 | 28:4 1996.12[民85.12] |
頁次 | 頁225-235 |
分類號 | 454.85 |
關鍵詞 | 沃斯田鐵; 肥粒鐵; 平衡狀態; 準平衡狀態; 重建式; 位移式; Austenite; Ferrite; Equilibrium; Metastable; Reconstructive; Displacive; |
語文 | 英文(English) |
中文摘要 | 本文回顧了鋼鐵中高溫沃斯田鐵變態為各種不同肥粒鐵相的相變機 構,包括有重建式與位移式兩種。在低過冷度的情況下,沃斯田鐵以重建式的機 構變態為肥粒鐵;此機構是利用熱能驅動原子以跨越沃斯田鐵/肥粒鐵界面,促成 界面的移動而完成變態。位移式機構則利用差排的滑動使得沃斯田鐵/肥粒鐵界 面移動而將沃斯田鐵相變態肥粒鐵相。位移式機構造成極大的剪應變產生於肥粒 鐵,故此機構只在過冷度較大時才會發生。本文並將鋼鐵中各相作一整體性的介 紹。 |
英文摘要 | The transformation mechanisms which high temperature austenite decomposed into various ferrite phases in steels are reviewed. Two categories of formation mechanisisms, namelyreconstructive and displacive, are found in steels. For low undercooling, austenite tends to transform into ferrite in a reconstructive manner, involving thermally activated atoms across the austenite/ferrite inter phase boundary. While the displacive growth of ferrite tends to occur at low formation temperature, which is associated with the gliding of crystal across the austenite/ferrite boundary and accomplishes a large shear strain. The formation mechanism of each individual phase in steels is discussed. Overall view of phase transformations in steels will be presented. |
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