鐵-21錳-0.5碳合金鋼之非擴散型相變化研究｜國立臺灣科技大學博碩士論文系統

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研究生：	徐永霖 Yung-lin Hsu
論文名稱：	鐵-21錳-0.5碳合金鋼之非擴散型相變化研究 A study of diffusionless transformationin a Fe-21Mn-0.5C alloy
指導教授：	鄭偉鈞 Wei-Chun Cheng
口試委員:	李志偉 none 王朝正 none
學位類別：	碩士 Master
系所名稱：	工程學院 - 材料科學與工程系 Department of Materials Science and Engineering
論文出版年：	2008
畢業學年度：	96
語文別：	中文
論文頁數：	113
中文關鍵詞：	鐵錳合金、非擴散型相變化
外文關鍵詞：	Fe-Mn alloy, diffusionless transformationin
相關次數：	點閱：142 下載：6
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本論文針對成分為鐵-21錳-0.5碳(wt%)合金進行研究。合金之熱處理方式為加熱至1100℃後，再經淬水方式冷卻至室溫。經金相觀察，合金的沃斯田體晶粒內有條狀析出物的產生。經XRD分析析出物的結晶結構，判定此條狀析出物應為具六方晶系的結晶結構。
經由TEM的擇區繞射圖分析，於HCP麻田散體析出物的鑑定中，取得HCP晶帶軸Z= 及Z= 的擇區繞射圖影像，故可完全確認部分之條狀析出物具六方晶系的結晶結構。且經由擇區繞射圖的分析，本論文確認於FCC晶粒內的條狀析出物具兩種結晶結構：除了HCP麻田散體析出物外，亦有FCC雙晶的結晶結構。
雙晶析出物與HCP析出物的比較，兩者的外觀形貌極為相近，不論於金相或是TEM明視野的觀察，皆無法將兩者區別出來，故目前並無法分辨兩者的形態上的差異性。唯一可以分辨兩者的差異性的方法，即是TEM的擇區繞射圖分析法。
由於HCP麻田散體或雙晶析出物皆可能由FCC的疊差的發生而產生，故在合金冷卻的過程中，因為熱應力的影響下，而使原子間交互滑動而於FCC{111}平面族上產生疊差群；在此由疊差的排列組合的條件下，雙晶及HCP的麻田散體於沃斯田體晶粒內的產生而析出應該是容易的。且由於兩者有相似的形態，及相似之Z=123F的合成晶帶軸擇區繞射圖，故兩者的生成似有其部份的共通性，故疊差理論似乎適用於兩者的形成條件，故兩者可同時形成於FCC晶粒內。

The thesis has been focus on the phase transformation of a Fe-Mn steel with a composition of Fe-21 wt% Mn-0.5 wt% C. The steel was heated to a temperature of 1100oC and followed by quenching in water at room temperature.
There are lots of small noodle-like precipitates distributed in the austenitic grains of the specimen from the optical microscopic study. Some of the precipitates were found to have the HCP crystal structure from the XRD analysis.
The selected area diffraction patterns (SAD) of the specimen were taken by the TEM study. In addition to our previous results, the SADs with the zone-axis directions of Z= 及Z= were obtained. Thus, the HCP crystal structure of the precipitate has been confirmed. However, we found that the precipitates have two different crystal structures via the observation in SADs. Therefore, in addition to the HCP martensite, the precipitates have another form of FCC twins. According to the studies of optical micrograph and TEM bright-field images, there are no differences in the morphologies of the HCP martensites and FCC twins. We could only distinguish them by the SAD study in TEM since they have different crystal structures.
The stacking faults are found in the FCC crystal structure of the Fe-Mn steel. It is easy for the austenitic grains to have stacking faults for the steel being cooled from high temperature. Thus, the thermal stress induced the steel to have stacking faults in the FCC grains. Thus, from the arrangement of the stacking faults, the HCP martensites or FCC twins could be easily formed in the austenitic grains. Similar morphologies of these two different precipitates and similar SADs along the zone axis of Z=123F were found. We believed there are several common features between HCP martensite and FCC twins in the steel. The stacking fault theory is believed to have some contributions in the formation of the precipitates.

目   錄

第一章	  前言.....................................................1
第二章  文獻回顧.................................................6
   2.1   擴散型相變化............................................6
         2.1.1   析出型相變化...................................6
         2.1.2   共析相變化...................................7
         2.1.3   有序化相變化...................................7
         2.1.4   塊狀相變化...................................7
   2.2  非擴散型相變化...............................8
         2.2.1   雙晶............................................8
         2.2.2    麻田散體相變化................................9
   2.3   部分的鐵錳鋁合金之相變化........................11
         2.3.1   鐵錳鋁合金的雙晶研究.......................12
 2.3.2   鐵錳鋁合金之18R麻田散體相變化.............14
 2.3.3   鐵錳碳合金之六方晶麻田散體相變態..........14
第三章  實驗方法................................................26
   3.1   合金配製................................................26
   3.2   合金的熱鍛及冷軋......................................27
   3.3   熱處理條件.............................................27
   3.4   分析方法................................................28
   3.5   實驗設備................................................30
   3.6   試片製作................................................31
   3.7   成分分析.............................................33
   3.8   實驗流程圖.............................................33

第四章  結果與討論.............................................37
   4.1  金相與愛克斯光繞射分析................................37
   4.2  HCP麻田散體析出物....................................38
   4.3  雙晶析出物.............................................45
第五章  結論...................................................109
參考文獻........................................................112

                                

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