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研究生:林柏佑
研究生(外文):Po-you, Lin
論文名稱:Fe-20 Ni-4.5Al-1.0C 合金鋼之相變化研究
論文名稱(外文):The study of phase transformations in an Fe-20 Ni-4.5 Al-1.0 C (wt.%) alloy steel.
指導教授:鄭偉鈞
指導教授(外文):Wei-Chun Cheng
口試委員:林熾燦王朝正鄭偉鈞
口試委員(外文):Chaur-Jeng Wang Wei-Chun Cheng
口試日期:2022-06-30
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:機械工程系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2022
畢業學年度:110
語文別:中文
論文頁數:90
中文關鍵詞:鐵鎳鋁合金鋼相變化B2相κ碳化物麻田散體相
外文關鍵詞:Fe-Ni-Al-C alloyphase transformationB2 phaseκ-carbidesmartensite phase
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  • 被引用被引用:2
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本論文針對鐵-20鎳-4.5鋁-1.0碳(wt.%)合金鋼經不同熱處理後產生不同組成與其對應的相變化作分析研究。熱處理分為:高溫1100℃持溫1小時後淬火至室溫水的固溶處理、固溶處理再經淬入液態氮的深冷處理、與固溶處理再於500C至1000C的溫度區間進行恆溫處理。固溶處理後的鎳鋁鋼為單一FCC沃斯田體相(γ);經深冷處理的金相組織轉變成在沃斯田體基地內出現板狀晶粒的BCT麻田散體;所以,於本鎳鋁鋼形成麻田散體的起始溫度(Ms)是介於零下176℃至室溫間,且於板狀麻田散體晶粒內分佈著細小的BCT麻田散體的機械雙晶晶粒。本鎳鋁鋼於1000℃至750℃的溫度區間,在沃斯田體晶界與晶粒內同時發生析出型相變化,析出顆粒狀分佈的有序B2晶粒,其為含富鎳與富鋁的相。當恆溫處理溫度低於750℃,微細的(Fe,Ni)3AlCxκ碳化物會在沃斯田體基地中析出。在鄰近κ碳化物附近的沃斯田體基地的鎳和碳擴散至碳化物而被吸收,造成臨近沃斯田體基地的鎳與碳含量之濃度下降,而有鎳與碳濃度梯度的產生,使其麻田散體轉換溫度(Ms)升高,並在冷卻後出現麻田散體。
Phase transformations and microstructure changes of an Fe-20 Ni-4.5 Al-1.0 C (wt.%) alloy have been studied through different heat treatments. The heat treatment conditions were divided into: solid solution for 1100℃ for 1 hour then water quenching to room temperature followed by quenching to liquid nitrogen and constant temperature treatment in the range from 500℃ to 1000℃. The results showed that the alloy exhibits two kinds of microstructure; a single FCC structure austenite phase after solution treatment and a plate-like of BCT martensite structure which appeared in austenite matrix after cooling with liquid nitrogen. It was found that, the starting temperature (Ms) of the formation of plate-like of BCT martensite is between minus 176°C and room temperature, and there are smaller mechanical double grains distributed in grains. In the temperature range of 1000℃ to 750℃, a large number of nickel-aluminum rich of B2 precipitates along the grain boundaries and in the grains of the austenite matrix. At temperature is lower than 750°C, it was observed that fine (Fe,Ni)3AlCx carbides precipitates grew in the austenite (γ), This was found to be attributed to nickel and carbon elements in austenite matrix being absorbed by the κ-carbide,, resulting in decreasing the concentration of nickel and carbon near the austenite matrix, finally, the transition temperature (Ms) increased, and the martensite appears after water quenching.
目  錄
中文摘要
英文摘要
誌  謝
目  錄
圖 目 錄
表 目 錄
第一章 前  言
第二章 文獻回顧
2.1 擴散型相變化
2.2 非擴散型相變化
第三章 實驗方法
3.1 鎳鋁合金鋼的鑄熔與加工
3.2 熱處理
3.3 儀器說明與試片製作
第四章 結果與討論
4.1 鎳鋁合金鋼的高溫相組成與相變化
4.2 鎳鋁合金鋼的低溫相組成與相變化
第五章 結論
參考文獻
參考文獻
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[2] Walnsch, A., et al. "Thermodynamics of martensite formation in Fe–Mn–
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