臺灣博碩士論文加值系統

錳鋁合金鋼具有優良的耐蝕與抗氧化性質，有取代鎳鉻系不銹鋼的潛力，而相變化研究可提供發展錳鋁不銹鋼的基礎。本論文研究二種不同鋁含量的錳鋁鋼相變化情形，其成份分別為鐵-24錳-8.5鋁-0.8碳的合金A與鐵-24錳-4.5鋁-0.9碳的合金B。實驗方法為經1100℃固溶處理與後續低溫恆溫處理。兩合金鋼經1100℃高溫冷卻後，皆發生spinodal相分離與有序化反應：於冷卻過程的高溫區間，高溫沃斯田體相(γ)經spinodal相分離而分解成為兩個貧碳與富碳沃斯田體相(γ’與γ”)，反應式為γ → γ’ + γ”；而富碳沃斯田體相於後續的冷卻過程經由有序化反應而相轉變為L12。我們於經固溶處理的沃斯田體基地發現週期性分佈的L12核，其晶格尺寸約為0.46 nm，所以確認以上的相變化機構。於合金A發現L12之析出上限溫度是介於700℃至650℃之間，而合金B的L12相的析出上限溫度是於300℃附近。所以，鋁含量較低的合金B於較低溫時析出L12相，故推判合金B因低鋁含量之因素，使spinodal相分離與有序化反應發生的溫度降低。

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 play an important role to support the research and development department. We have studied the phase transformations of two Fe-Mn-Al steels with the compositions of Fe-24 Mn-8.5Al-0.8C (wt%) and Fe-24 Mn-4.5Al-0.9 C. The methodology of the experiments includes heating the steel at 1100℃, quenching to room temperature, and holding isothermally at low temperatures. The results show that the spinodal decomposition and ordering reaction occur in the Fe-Mn-Al steel after heating at and cooling from 1100℃. The reactions are as follows.γ → γ’ + γ” where  is the high temperature austenite, and γ’ and γ” are low temperature austenite phases. The carbon contents of both phases are different. γ’ is low in carbon, and γ” is high in carbon. The carbon-enriched austenite phase also transforms into L12 phase via ordering reaction upon further cooling to lower temperatures as follows. γ” → L12. After the isothermal holding at low temperature, we have also found that κ-carbide appears in the austenite as either grain boundary or cellular precipitate. When the isothermal holding temperatures are below to 750℃, the cellular precipitates are composed of lamellar austenite and κ-carbide.

第一章簡 介 1
第二章文獻回顧 4
2.1擴散型相變化(diffusional transformation) 4
2.2合金鋼中之碳化物 10
2.3退火雙晶 13
2.4 Spinodal相分離 14
2.5有序化相變化 15
第三章實驗方法 29
3.1合金鋼熔鑄 29
3.2鑄錠加工 30
3.3合金熱處理 31
3.4試片製備流程 33
3.5分析儀器 37
第四章結果與討論 47
4.1合金A 48
4.1.1低溫相變化 48
4.2 合金B 56
4.2.1低溫相變化 56
4.3 Spinodal相分離 60
第五章結 論 124
參考文獻 126

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