隨著時代進步與科技發展，對於先進合金鋼材料的需求日益增加，其中對具有高比強度合金鋼的需求是越來越大，而鐵鎳錳鋁系合金鋼具有優異的比強度性質，並具有耐腐蝕的特性，是具有廣闊的應用前景。本論文研究五元Fe-20 Ni-15 Mn-4.5 Al-0.5 C (wt.%)合金，經高溫1100°C固溶處理以及恆溫處理後的顯微組織與結晶結構變化。本合金鋼於1100°C為單一沃斯田體相(γ)，經1100°C固溶處理的沃斯田體相發生spinodal相分離，形成低溶質的γ′相與高溶質的γ″相，其反應式為γ → γ′ + γ′′；於恆溫處理後合金的相變化如下：於1000°C至450°C恆溫處理後，於基地γ相的晶界處以及晶粒內有富鎳鋁B2相的析出，其反應式為：γ → γ1 + B2，且B2相與基地沃斯田體有[011]γ // [¯111]B2以及(11¯1)γ // (01¯1)B2的K-S方位關係。於850°C至575°C恆溫處理經析出相變化有富鐵錳相之碳化物(M3C或為M23C6)的析出，反應式：γ → γ1 + B2 + 碳化物。經1100°C固溶處理的沃斯田體相發生spinodal相分離後所形成的含高溶質的γ″相於550°C以下溫度的恆溫處理會發生有序化反應轉變為整合型析出之κ-碳化物，反應式為γ → γ′ + γ′′ → γ′ + κ-碳化物。本合金於550°C至450°C有層狀組織的出現。

Demand for advanced steel materials has increased as science and technology advance, particularly for high specific strength alloy steel. The Fe-Ni-Mn-Al alloy system has excellent mechanical properties and corrosion resistance, and hence has a broad application prospect. In this study, the phase transformation of an Fe-Ni-Mn-Al alloy of the composition Fe-20 Ni-15 Mn-4.5 Al-0.5 C (wt. percent) was studied after solution treatment and isothermal treatment at 1100°C by observing and analyzing the microstructural and crystal structure changes. At 1100°C, the alloy consists of a single phase of austenite (γ). After solution treatment at 1100°C, the austenite decomposed into solute lean (γ') and solute enriched (γ'') via spinodal decomposition. After isothermal treatment at 1000°C to 450°C, nickel-aluminum rich B2 phase formed at the grain boundaries of γ matrix, and the reaction is γ → γ1+ B2. The Kurdjumov-Sachs (K-S) orientation relationship between the B2 and austenitic phases is [011]γ // [¯111]B2 and (11¯1)γ // (01¯1)B2. Precipitation of iron-manganese rich carbides (M3C or M23C6) phase was observed after isothermal treatment at 850°C to 575°C., and the reaction is γ → γ1 + B2 + carbide. The solute enriched (γ'') transformed to κ - carbides by ordering reaction during isothermal treatment at 550°C to 450°C, the overall reaction is γ → γ' + γ''→ γ'+ κ - carbides. At 550°C to 450°C, formation of lamellar structure was also observed.

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