摘要
近年來，鐵錳鋁碳的鋼已被研究作為高強度鋼板在汽車業應用，以減少汽車的重量和氣體排放里程。相圖和相變化的知識是鐵錳鋁碳鋼研究發展的基本要求。本研究中，探討鐵錳鋁碳的高強度鋼於不同成分等值線相圖的研究。

研究中的等值線是先經由計算相圖方法計算後，藉由一系列的實驗試片準備及分析檢視對於計算等值線和這些試驗的結果，當作計算相圖數據庫的修改。實驗中使用X射線和電子微探儀（EPMA）分析平衡熱處理後的顯微結構及成分。

本論文中，第一部分主要探討Fe-5.3Mn-2.3Al-0.3C合金結構鋼在550 oC鹽浴熱處理後顯微結構的相變；第二部分是透過製備鋁，錳和周圍的Fe-5.3Mn-2.3Al-0.3C合金區域碳含量的各種成分來討論其組織和相圖的關係。

Abstract
Recently, the Fe-Mn-Al-C steels have been studied as high strength steel to apply in automobile industry in order to reduce the car weight and gas mileage. Phase diagram and phase transformation knowledge are the basic requirement for the development of the Fe-Mn-Al-C steels. In this study, the phase diagram of Fe-Mn-Al-C was investigated in several isopleths related to the development of high strength steels.

The isopleths were calculated by CALPHAD method first. A series of samples were prepared to check the calculated isopleths and these experiment results were applied to revise the data base. The experiments included equilibrium heat treatment and microstructure analysis using X-ray and electron microprobe (EPMA).

The first part focuses on the phase transformation of Fe-5.3Mn-2.3Al-0.3C alloy steel at 550 and 600 oC under a salt bath experiment. The second part is to study the microstructure and phase diagrams by preparing various contents of aluminum, manganese and carbon content around Fe-5.3Mn-2.3Al-0.3C alloy region.

總目錄
論文審定書 i
致謝 ii
摘要 iii
Abstract iv
總目錄 v
表目錄 vii
圖目錄 viii
壹、前言 1
貳、文獻回顧 3
2.1鐵錳鋁碳合金特性簡介 3
2.2合金元素對材料之影響 3
2.2.1鋁含量對鐵鋁錳合金之影響 4
2.2.2錳含量對鐵鋁錳合金之影響 4
2.2.3碳含量對鐵鋁錳合金之影響 4
2.3相變化 5
2.3.1擴散型相變化 6
2.3.2非擴散型相變化 6
2.3.3鐵錳鋁合金的相變化 7
2.3.3.1析出相變化 7
2.3.3.2 D03的有序化相變化 7
2.3.3.318R 針狀麻田散體 8
2.3.3.4 BCC 麻田散體 9
2.4 鐵錳鋁碳相圖相關研究 10
2.5 Fe-5.3wt%Mn-2.3wt%Al-0.3wt%C相圖 11
2.6鐵錳鋁碳之TTT曲線圖 11
參、實驗方法與步驟 13
3.1實驗方法 13
3.2實驗步驟 13
3.2.1合金熔鑄 13
3.2.2試片熱處理 14
3.2.3金相前處理 14
3.2.3鹽浴處理 16
3.2.4金相觀察與定量分析 16
3.2.5XRD結構分析 16
3.2.6 硬度試驗機 17
肆、結果與討論 18
4.1第一部分實驗: 中鋼提供Fe-5.3Mn-2.3Al-0.3C熱軋鋼板之TTT圖研究 18
4.2第二部分實驗:探討熔鑄後不同碳、錳及鋁含量時顯微結構與相圖關係 19
4.2.1熔鑄後之錳碳鋼 19
4.2.2熔鑄後並時效處理之錳碳鋼 22
4.2.3 Fe-5.3Mn-2.3Al-0.3C相圖探討 25
伍、結論 26
陸、參考文獻 28

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