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題 名 | 以EBSD觀察鉻鉬鋼熱浸鋁化層於高溫之相變化=Phase Transformation in the Aluminide Cr-Mo Steel at High Temperature Observed by Using EBSD |
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作 者 | 鄭維仁; 王朝正; | 書刊名 | 防蝕工程 |
卷 期 | 21:4 2007.12[民96.12] |
頁 次 | 頁265-271 |
分類號 | 472.16 |
關鍵詞 | 電子背向繞射; 鉻鉬鋼; 熱浸鍍鋁; 鋁化層; 相變化; EBSD; Cr-Mo steel; Hot-dipping; Aluminide layer; Phase transformation; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究使用5Cr-0.5Mo鋼經熱浸鍍鋁後,於750℃空氣進行擴散,利用電子背向繞射(Electron Backscatter Diffraction, EBSD)技術,分析Fe-Al鋁化層在高溫所發生的相變化。實驗結果顯示,熱浸後的鋁化層,由外層的FeAl₃相及內層的Fe₂Al₅相所組成。隨高溫暴露時間之延長,Fe₂Al₅相持續成長,FeAl₃相的厚度則無明顯改變。但當最外側的熱浸純鋁塗層消耗完後,FeAl₃也隨之消失。於750℃保持 60分鐘後可以發現到FeAl₂相於Fe₂Al₅相的內外兩側生成,並有FeAl相出現於FeAl₂與基材之交界處。長時間擴散後,FeAl相成長,且FeAl₂相取代了大部分的Fe₂Al₅相。此外,由晶粒取向圖(Crystal Orientation Map, COM)顯示,Fe₂Al₅相皆沿著晶體結構中C軸[001]的方向成長。 |
英文摘要 | 5Cr-0.5Mo steel was coated by hot-dipping into a molten bath containing pure Al. The phase transformation in the aluminide layer during diffusion at 750 ℃ in static air was analyzed by Electron Backscatter Diffraction (EBSD). The results showed that the aluminide layer in the ascoated specimen consisted of an outer FeAl₃ layer and an inner Fe₂Al₅ layer. The Fe₂Al₅ phase kept growing with increasing exposure at 750 ℃, but the FeAl₃ phase didn't change significantly. The FeAl₃ phase disappeared once the aluminum layer was consumed. After 60min of exposure at 750 ℃, FeAl₂ phase formed at the inner and outer sides of the Fe₂Al₅ phase while FeAl phase formed at the interface between FeAl₂ and the steel substrate. With prolonged exposure, the thickness of FeAl increased and the volume of FeAl₂ expanded at the expense of Fe₂Al₅. Based on Crystal Orientation Map (COM), Fe₂Al₅ grew preferentially along the C-axis, [001] direction, of the crystal structure. |
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