本論文主要於高錳合金鋼中添加鋁合金元素對其於不同溫度下的相變化影響。此高錳鋼的成份為鐵-19.8錳-1.64鋁-1.03碳(wt.%)，故亦稱作錳鋁合金鋼或是錳鋁鋼。本錳鋁鋼的熱處理方式為先經1100℃的高溫固溶處理後，再於850℃以下的溫度進行持溫100小時的恆溫熱處理。
經1100℃固溶處理後的合金鋼，其內的相組成為沃斯田體的基地相及於其內的條狀麻田散體相，此條狀麻田散體相是由FCC微小雙晶所構成。此FCC條狀麻田散體在後續之低溫恆溫處理後，仍繼續存留在沃斯田體的晶粒中。合金鋼再於850至450℃進行恆溫處理後，於沃斯田體晶界處發現有共存的M3C與M23C6碳化物；本錳鋁鋼內存在之M3C與M23C6碳化物的上限溫度是介於800至775℃之間。而當熱處理溫度低於650℃時，本論文亦發現二種各別發生之共析反應，部份介穩態之沃斯田體將會分解成二種碳化物與肥粒體組成之層狀波來體組織以達穩定狀態，以上的碳化物可能為M3C或是M23C6。我們同時也發現M3C與M23C6波來體同時共存於同一沃斯田體晶粒內之現象。本錳鋁鋼之共析反應的上限溫度是介於675至650℃之間，而波來體的恆溫變態曲線的鼻部區域溫度約為525℃。
於晶粒間的方位關係研究，於本錳鋁鋼內M3C波來體中，M3C碳化物與鄰近的肥粒體晶粒間，出現一組平行的晶帶軸上，具有兩組平行之平面：[010]C // [11-1]α；(10-3)C // (011)α及(10-1)C // (112)α，也發現著名之N-W方位關係：[-101]C6 // [001]α；(111)C6 // (110)α，其為FCC的M23C6碳化物與BCC的肥粒體晶粒間之方位關係。

We have studied the phase transformations of a Mn-Al steel at various low temperatures. The composition of the steel is Fe-19.8 Mn-1.64 Al-1.03 C (wt.%). We investigated the effects of adding Mn and Al elements to the M3C and M23C6 pearlites in the high manganese steel. The heat treatment of the steel is heating at 1100℃ for solution heat treatment and holding isothermally at temperatures below 850℃ for 100 hours.
The constituent phase of the steel is single austenite at temperatures between 1100 and 800℃. Irregular martensitic plates appear in the austenitic matrix after the solution heat treatment. The martensitic plates are FCC micro-twins. Irregular martensitic plates still exist in the austenitic matrix after the isothermal holding processes. At temperatures below 800℃, we discovered the coexistence of M3C and M23C6 carbides in the forms of either grain boundaries or pearlitic colonies. The upper temperature limit for the existence of these two carbides is between 800 and 775℃. At temperatures below 650℃, we found two different pearlites: one is M3C pearlite which is lamellae of M3C and ferrite, and the other is M23C6 pearlite which is lamellae of M23C6 and ferrite. These two pearlites are from two separate eutectoid reactions, i.e. the supersaturated austenite has decomposed into two separate colonies of ferrite and carbide. The upper temperature limit for the existence of the two various pearlites is between 675 and 650℃. The nose temperature for appearance of both pearlites is near 525℃.
We have investigated the orientation relationships between different crystals, such as ferrite and carbides, and some results are shown as follows. A variant orientation relationship has been found between M3C carbide and ferritic grains: [010]C // [11-1]α; (10-3)C // (011)α, (10-1)C // (112)α. In M23C6 pearlite, we also discovered the well-known N-W orientation relationship between M23C6 carbide and ferrite: [-101]C6 // [001]α；(111)C6 // (110)α.

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