臺灣博碩士論文加值系統

本論文研究重量百分比的成分為Fe-21.1Mn-0.05Al-0.37C的高錳合金鋼，經不同溫度熱處理後，相變化及結晶結構的改變的情形。合金所經過的處理方式為：熱鍛、冷軋、高溫熱處理及低溫時效處理等。於高溫熱處理的溫度為1300℃至1050℃，冷卻方式為淬火及空冷等。低溫時效處理的方式為：合金經1100℃的固溶處理後，再經1000℃至500℃的時效處理。
合金施以高溫熱處理後，由金相及XRD的觀察知此合金為雙相結構：一為FCC基地相，另一為的晶粒內的密集條狀的析出物。且在基地相也可以觀察有雙晶組織。再由TEM的觀察，發現此條狀的析出物為擬似麻田散體相。由於觀察此一析出物須於幾種特殊角度方可觀察到，故其與FCC基材是有某些方向的整合性。
合金在經由爐冷或1000℃及900℃的時效處理後，由金相顯微鏡的觀察，在晶粒內佈滿ε麻田散體和雙晶組織，且在ε麻田散體的平行線條中間，可以觀察到條狀的析出物。利用X光繞射儀的分析，比對知道合金的基地結構為FCC晶體結構，而且有條狀的析出物所貢獻而產生的繞射峰。經TEM的觀察，在FCC基地中有條狀析出物及ε麻田散體的產生。
合金於800℃至500℃之時效處理後觀察，在FCC基地相的晶粒內仍觀察到密集的條狀析出物，其型態與合金施以高溫熱處理後的結果相同，故判定800℃以下之低溫時效，因原子擴散驅動力不足，ε麻田散體無法產生，故基地維持固溶時之金相組織的狀態。

The alloy steel with a composition of Fe-21.1 wt% Mn-0.37wt% C was studied. Some specimens were heated at several high temperatures from 1300℃ to 1050℃, followed by quenching into water or air-cooling. Lots of precipitates with a wicker shape distributed uniformly in the FCC grains. In TEM study, we found the precipitates which could only be observed in some special angle had some characteristics of martensite phase. Therefore, the precipitates are coherent with the FCC matrix.
For specimens heated at 1100℃ for solution heat treatment and aged at following low temperatures from 800℃ to 500℃, the phases existed in the specimens were similar to those specimens heated at temperatures from 1300℃ to 1050℃ and quenched into cold water or air-cooled.
For specimens heated at 1100℃ and followed by furnace cooling, or aging at temperatures from 1000℃ to 900℃, we found ε martensite phase appeared in the FCC matrix of the alloy in addition to the wicker form precipitates.

第一章 前 言.............................................1
第二章 文獻回顧..........................................5
2.1 擴散型相變化......................................5
2.1.1 析出相變化.................................5
2.1.2 有序化相變化...............................6
2.1.3 塊狀相變化.................................6
2.2 非擴散型相變化....................................7
2.2.1 雙晶變態...................................7
2.2.2 麻田散體變態...............................8
2.3 鐵錳鋁合金之相變化...............................11
2.3.1 鐵錳鋁合金的雙晶探討......................12
2.3.2 鐵錳鋁合金的麻田散體相變化................13
第三章 實驗方法.........................................22
3.1 合金配製.........................................22
3.2 合金的加工.......................................22
3.3 熱處理...........................................23
3.4 試片製作.........................................24
3.5 實驗設備.........................................26
第四章 結果與討論.......................................33
4.1 高溫熱處理......................................33
4.2 低溫時效......................................37
第五章 結論.............................................86
參考文獻.................................................90

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