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研究生： 簡紹羽
Shao-Yu Chien
論文名稱： 鐵-29錳-9鋁-0.1碳合金鋼之相變化研究
The study of phase transformations in the Fe-29 Mn-9 Al-0.1 C steel
指導教授： 鄭偉鈞
Wei-Chun Cheng
口試委員: 雷添壽
Tien-Shou Lei
丘群
Chun Chiu
學位類別： 碩士
Master
系所名稱： 工程學院 - 機械工程系
Department of Mechanical Engineering
論文出版年： 2016
畢業學年度： 104
語文別： 中文
論文頁數： 154
中文關鍵詞： 鐵錳鋁合金鋼 、spinodal相分離 、有序化相變化 、α-錳 、β-錳 、D03相
外文關鍵詞： Mn-Al steels, spinodal decomposition, ordering reaction, α-Mn, β-Mn, D03.
相關次數： 點閱：419  下載：3 
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  •  上一筆

    • 鐵錳鋁合金鋼具有取代部分傳統鎳鉻系不銹鋼的潛力，而研究錳鋁合金鋼相變化的資料則是發展錳鋁不銹鋼的重要研發基礎。本論文是研究鐵-28.5錳-8.8鋁-0.09碳合金鋼的相變化情形，藉以增加發展鐵錳鋁不銹鋼的基礎資料。實驗方法為將錳鋁合金鋼加熱至1100℃後以水淬或空冷方式冷卻至室溫，且經水淬合金鋼再作低溫恆溫處理。研究顯示經由1100℃冷卻的錳鋁合金鋼內產生spinodal相分離與有序化反應，於冷卻過程，高溫肥粒體(α)分離為低溫低碳肥粒體(α')與富碳肥粒體(α'')，其反應式為α → α' + α''，而富碳肥粒體相於更低溫時會經有序化相變化而相轉變為D03相，其反應式為α'' → D03。於低溫恆溫處理的研究中，我們亦發現β-錳、α-錳與D03析出於肥粒體基地內，其中β-錳析出的溫度範圍介於750℃至500℃之間；而α-錳與D03存在的溫度範圍是低於500℃。

    Fe-Mn-Al steels have the potential to substitute some of the commercial Ni-Cr stainless steels. For the development of Mn-Al stainless steels, phase transformations of the steels provide the basic requirement for the research and development department. Our methods of studying the phase transformations of the Fe-28.5 Mn-8.8 Al-0.09 C (wt.%) steel include water-quenching and/or air-cooling to room temperature after heating the steel at 1100℃. The as-quenched specimens also isothermally held at low temperatures. The results of our study show that the spinodal decomposition occurs in the steel after heating and cooling from 1100℃, the high temperature ferrite (α) decomposes by the spinodal mechanism into low temperature solute-lean ferrite (α') and solute-rich ferrite (α''). The solute-rich ferrite phase also transforms into the D03 phase via the ordering reaction upon further cooling to lower temperatures. The spinodal decomposition process can be written as follows. α → α' + α'' → α' + D03. On the other hand, precipitation reaction occurs after isothermal holding at temperature below 800℃. β-Mn precipitates in ferrite grains after isothermal holding the steel at temperature ranging from 750℃ to 500℃. At temperature below 500℃,α-Mn and D03 appear in the ferrite grains.

    第一章 簡 介 第二章 文獻回顧 2.1析出型相變化 2.2 共析型相變化 2.3塊狀相變化 2.4有序化相變化 2.5 Spinodal相分離 2.6鐵錳鋁碳合金鋼的相變化 第三章 實驗方法 3.1 熔鑄合金鋼 3.2 合金鑄錠加工 3.3 試片熱處理 3.4 試片製備流程 3.5 分析儀器 第四章 結果與討論 4.1 高溫相變化 4.2 Spinodal相分離與有序化相變化 4.3 低溫析出物 第五章 結 論 參考文獻

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