鐵錳鋁合金鋼為學術界研發中的不鏽鋼，具有取代傳統鎳鉻系不鏽鋼的潛力，而相變化為研究錳鋁合金鋼的基礎。本論文則是研究成分為鐵-28.5錳-8.8鋁-0.098碳(wt.%)的合金A與鐵-19.6錳-7.7鋁-0.28碳的合金B內18R麻田散體相變化。合金鋼的熱處理條件為加熱至1350℃至1100℃的高溫，接著以水淬或是空冷方式冷卻。於1150℃以上高溫，經水淬處理後的肥粒體晶粒內皆有18R麻田散體的出現。而經空冷處理的肥粒體晶粒內則是出現魏德曼沃斯田體組織。
當溫度介於1350℃至1200℃之間時，合金A為肥粒體的單相組織；經水淬處理後的肥粒體晶粒內皆有密集且粗大的18R麻田散體的出現；當溫度為1150℃，於雙相組織內的肥粒體晶粒內則出現少量的針狀18R麻田散體；於1100℃時，只觀察到肥粒體與沃斯田體的雙相組織，未發現18R麻田散體的存在，故推測18R麻田散體在錳鋁合金鋼內出現的下限溫度介於1150℃與1100℃之間。
合金B於1100℃以上高溫皆為肥粒體與沃斯田體的雙相組織，經1150℃以上高溫水淬處理後，於晶粒尺寸大於臨界值的肥粒體晶粒內方有18R麻田散體的出現，且有18R針狀組織空乏區的分佈。

Fe-C-Mn-Al steels with the potential to replace some Ni-Cr stainless steels have been studied for decades. Phase transformations are the basic requirement for the development of Fe-C-Mn-Al steels. We have studied the 18R martensitic phase transformations of steel A with the composition of Fe-0.098 C-28.5 Mn-8.8 Al and steel B Fe-0.28 C-19.6 Mn-7.7 Al in various heat treatments including heating to temperatures from 1350℃ to 1100℃ and cooling by water-quenching and/or air-cooling.
Alloy A is composed of ferrite grains which are occupied by 18R martensitic plates after quenching from 1200℃ and/or above. At 1150℃, some 18R martensitic plates appear in ferrite with a dual-phase structure. No 18R martensite forms in the ferrite of the dual phases at 1100℃. So we confirm that the low temperature limit for the formation of 18R martensite of the steels locates at temperature between 1150℃ and 1100℃.
Alloy B is composed of ferrite and austenite at temperatures above 1100℃. After water quenching at 1150℃ or above, the 18R martensitic plates appear in the ferrite grains with the grain size larger than the critical value. We have also observed the needle-free zones in the ferrite grains located nearby the austenite grains.

1.P.R.S. Jackson, G.R. Wallwork, “Oxidation of Metals”, 21, 135 (1984).
2.龔吉合、潘德華、楊希文、傅承祖、施並裕、丁原傑，「材料科學導論(機械材料)」，滄海書局，310 (1998)。
3.M.C. Li, H. Chang, P.W. Kao, D. Gan, Mater. Chem. Phys., 59, 96 (1999).
4.吳孟哲，「鐵錳鋁合金內體心立方麻田散體的研究」，國立台灣科技大學，碩士論文 (2013)。
5.H. Okamoto, in: H. Baker (Ed.), “Alloy Phase Diagrams”, ASM Handbook, vol. 3, ASM International, 2 (1992).
6.J.G. Duh, C.J. Wang, J. Mater. Sci., 25, 2063 (1990).
7.X.J. Liu, S.M. Hao, L.Y. Xu, Y.F. Guo, H. Chen, Metall. Trans. A, A27, 2429 (1996).
8.K.H. Hwang, C.M. Wan, J.G. Byrne, Scripta Metall., 24, 979 (1990).
9.S.K. Chen, K.H. Hwang, C.M. Wan, J.G Byrne, Scripta Metall., 24, 151 (1990).
10.W.S. Yang. K.H. Hwang, T.B. Wu, J.G. Byrne, C.M. Wan, Scripta Metall., 24, 1221 (1990).
11.W.S. Yang, T.B. Wu, C.M. Wan, Scripta Metall.Mater., 24, 895 (1990).
12.K.H. Hwang, C.M. Wan, J.G. Byrne, Mater. Sci. Eng. A, 132, 161 (1991).
13.K.H. Hwang, W.S. Yang, T.B. Wu, C.M. Wan, J.G. Byrne, Acta Metall. 39(5), 825 (1991).
14.C.H. Chao, N.J. Ho, Scripta Metall., 26, 1863 (1992).
15.H.Y. Chu, F.R. Chen, T.B. Wu, Scripta Metall., 33(8), 1269 (1995).
16.W.B. Lee, F.R. Chen, S.K. Chen, G.B. Olson, C.M. Wan, Acta Metall., 43, 21 (1995).
17.K.H. Hwang, C.M. Wan, J.G Byrne, Mat. Sci. Eng.A, 132, 161 (1991).
18.W.C. Cheng, H.Y. Lin, Mat. Sci. Eng. A, 323, 462 (2002).
19.W.C. Cheng, C.F. Liu, Y.F. Lai, Scripta Metall., 48, 295 (2003).
20.K.H. Hwang, S.K. Chen,W.S. Yang,T.B. Wu,C.M. Wan,J.G. Byrne, Acta Metall,24,495 (1990).
21.C.H. Chao, N.J. Ho. Scripta, Metall. Mater. ,27,499 (1992).
22.C.H. Chao, N.J. Ho, Scripta Metall., 27, 493 (1992).
23.W.B. Lee, F.R. Chen, S.K. Chen, C.M. Wan., Scripta Metall Mater., 31, 695 (1994).
24.D.A. Porter, K.E. Easterling, “Phase Transformations in Metals and Alloys”, 3/e, Nelson Thornes (2008).
25.崔占全、王昆林、吳潤，「金屬學與熱處理」，北京大學出版社， (2010)。
26.E. Robert, Phys. Met. Principles, 3/e (2002).
27.L. Cheng, X.L. Wan, K.M. Wu, “Materials Characterization”, vol. 61, pp. 192-197 (2010).
28.A.G. Crocker, J. De Phys. Colloque C4, pp. 209-218 (1982).
29.楊榮顯，「工程材料學」，全華科技圖書股份有限公司，4-13 (2016)。
30.D. Henkel, A.W. Pense, “Structure and Properties of engineering materials”, 5th ed, Mc Graw Hill (2004).
31.劉國雄、鄭晃忠、李勝隆、林樹均與葉均蔚，「工程材料科學(新版)」，全華科技圖書股份有限公司，(2006)。
32.王祺文，「10錳含量之鐵錳鋁合金、B2、D03相變化研究」，國立臺灣科技大學，碩士論文 (2005)。
33.P.M. Kelly, Acta metal, 13, pp. 635 (1965).
34.林東一，「鐵-21錳-0.5碳合金之麻田散體相變化研究」，國立台灣科技大學機械工程研究所，碩士論文 (2007)。
35.H.J. Kestenbach, Metallography, 10, pp. 189-199 (1977).
36.黃建彰，「鐵錳鋁合金中有序化FCC結構之析出物研究」，國立臺灣科技大學，碩士論文 (2004)。
37.T.B. Massaski, Metall. Trans. A, 15A 421 (1984).
38.M.X. Zhang and P.M. Kelly, Acta mater. Vol. 46, No. 13, pp. 4617-4628 (1998).
39.鮑忠興、劉思謙，「近代穿透式電子顯微鏡實務(第二版)」，滄海書局 (2008)。
40.J.W. Edington, “Monographs in Practical Electron Microscopy in Materials Science”, 1st ed, Philips Technical Library (1985).
41.P.G. Shewmon, “Transformation in Metals”, McGraw-Hill, 257 (1969)