本論文研究的合金成分為鐵-21.1錳-0.5碳的高錳鋼。論文主題為探討此高錳鋼於高溫熱處理後所產生的麻田散體相變化情形。合金的處理流程分為：熱鍛、冷軋、高溫熱處理及低溫時效等。
合金於1350℃至1050℃進行高溫熱處理後，經淬水或空冷方式冷卻至室溫，其合金的金相組成為FCC相及FCC晶粒內有雙晶及條狀析出物產生。此條狀析出物為具有六方晶系的結晶結構，此為首次發現之結晶相，其晶格常數為a=0.2544 nm及c=0.4079 nm。析出物於基地相中析出時，其與基材具有至少兩種的方位關係；若下標F代表FCC基材，而H代表析出物，其方位關係分別是：[111]F // [0001]H，(220)F // (11 0)H；以及[ ]F // [0001]H，(220)F // (11 0)H及(311)F // (1 00)H。
合金於1350℃在不同氣氛下進行熱處理時，其金相組織有極大的差異。於氬氣保護下的試片，其於基地相晶粒中有上述的HCP條狀析出物產生，而於空氣中進行熱處理的試片，觀察到平板狀析出物，此平板狀析出物為ε麻田散體。經成分分析後，發現在空氣中進行熱處理的試片，其碳含量是大量的減少。故判定ε麻田散體形成的沃斯田體基地碳含量較HCP條狀析出物的沃斯田體基地為少。

The thesis was to study the martensitic phase transformation of a Fe-21.1wt%Mn-0.5wt%C alloy after being cooled from high temperatures. Several different heat treatments were imposed on the alloy. These included heating to temperatures from 1350℃ to 1050℃, and holding for periods of either 30 min or 1 h. Samples were also cooled from those temperatures by quenching into water at room temperature or air-cooling.
Lots of precipitates with the wicker shapes distributed in FCC grains uniformly after the specimens were cooled from high temperatures. We observed the precipitates having the characteristics of martensite. The precipitate is HCP with which lattice constants are a = 0.2544 nm and c = 0.4079 nm. It is the first time that a new HCP phase formed in the Fe-Mnl-C alloy was observed. In addition, there are two sets of orientation relationships between the HCP precipitate and FCC matrix. One is [111]F// [0001]H, (220)F//( )H, and the other is [ ]F// [0001]H, (220)F//( )H, (311)F//( )H, where F stands for FCC matrix and H for the HCP precipitate. Two sets of orientation relationships are quite unusual for the formation of a precipitation from the matrix.
The specimen heated at 1350℃ in the air, followed by the same cooling method as above. In stead of HCP precipitates, εmartensite distributed uniformly throughout the FCC matrix. We foundεmartensite forms at the condition that the alloy was with low carbon content.

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