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研究生:林美娟
研究生(外文):Mei-Chuan Lin
論文名稱:AISI440C不�袗�深冷及隨後回火相變態之電子顯微鏡微結構研究
論文名稱(外文):The study of the microstructure of AISI 440C steel''s transformation by deep-cooling and tempering.
指導教授:楊哲人楊哲人引用關係
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:材料科學與工程學研究所
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2005
畢業學年度:93
語文別:中文
論文頁數:106
中文關鍵詞:440C不�袗�板片狀麻田散鐵雙晶中脊面(midrib)
外文關鍵詞:440C stainless steelplate martensitetwinsmidrib
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摘 要
AISI 440C麻田散鐵系不�袗�,其成份主要為高含量的碳及鉻元素,使其硬化能很高,均質化處理後採用空冷即可避過肥粒鐵的相線區,但也導致其Ms溫度低於室溫,故需以深冷處理方能相變得到麻田散鐵組織,但基底仍殘有大量沃斯田鐵,故再施以回火處理消除殘留沃斯田鐵,並改善麻田散鐵相變後之韌性與機械性質,期望能得到最佳的性質。
本次實驗著重在深冷後的板片狀麻田散鐵組織及回火處理後的回火板片狀麻田散鐵組織,逐一觀察各項處理後所形成之組織變化,並以穿透式電子顯微鏡分析各相微觀組織。觀察後發現板片狀麻田散鐵基地是由雙晶所組成,有中脊面(midrib)的痕跡及伴隨大量的疊差區;回火板片狀麻田散鐵基地除了雙晶和中脊面外,有多種的合金碳化物得析出,並發現部分中脊面兩側的雙晶有小角度的轉折。除此之外,回火麻田散鐵板片週圍所觀察到的中低碳區麻田散鐵板條狀組織,來推斷殘留沃斯田鐵分解後基底重新分配後的相變結果。
Abstract
AISI 440C is an important alloy steel and is widely applied in medical appliances, cutting tools and turbine blades. The steel typically contains 1 wt% carbon and 17% Cr, so that the MS Temperature is expected to be much lower than the room temperature. After quenching into liquid nitrogen, It gives plate martensite, which has a burst formation with Zig-Zag morphology. There is still remaining a great quantity of retained austenite in the matrix. In order to deliminate the retained austenite, the tempering treatment is necessarily carried out.
In the study, plate martensite and tempered martemsite has been examined after different cycles of tempering. The orientation relationship between the twins within the plate martensite has been investigated through the electron diffraction of TEM. In addition, it has found that after multi-tempering cycles the MS temperature gradually rises with increasing the repeated cycling numbers, and that austenite transforms into ferrite and carbides, step by step.
目 錄
第1章 前言˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙1
第2章 文獻回顧˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙2
2.1 不�袗�及麻田散鐵系不�袗�…………………………………….2
2.1.1 AISI 440C不�袗�……………………………………………...3
2.2 麻田散鐵相變化………………………………………………….4
2.2.1 麻田散鐵的特徵………………………………………………5
2.2.2 麻田散鐵的晶體結構…………………………………………6
2.2.3 麻田散鐵的結晶學……………………………………………7
2.2.4 麻田散鐵的形態學…………………………………………..12
2.2.4.1 板條狀麻田散鐵………………………………………….12
2.2.4.2 板片狀麻田散鐵………………………………………….13
2.3 回火……………………………………………………………...14
2.3.1 回火四階段…………………………………………………..15
2.3.2 回火碳化物…………………………………………………..16
2.3.3 回火與循環回火對基地相變化之影響……………………..17
第3章 材料製備及使用儀器˙˙˙˙˙˙˙˙˙˙˙˙˙˙35
3.1 實驗材料………………………………………………………...35
3.3.1 材料的前製程………………………………………………..35
3.2 實驗流程………………………………………………………...36
3.3 熱模擬儀器……………………………………………………...36
3.4 金相製備………………………………………………………...37
3.5 硬度測試………………………………………………………...37
3.6 電子顯微鏡試片製作及觀察…………………………………...37
第4章 AISI 440C不�袗�麻田散鐵回火相變態研究˙˙˙˙42
4.1 均質化組織觀察………………………………….…...….……..42
4.1.1 OM之觀察……………………………………..…..…………42
4.2均質化後深冷處理之組織觀察…..………….…..…………...…43
4.2.1 OM之觀察………………………………………….….……..43
4.2.2 SEM之觀察…………………………….…….………..……..44
4.2.3 TEM之觀察………………………………..………..………..45
4.3 相同溫度持溫短時間與長時間回火處理之比較………....…...46
4.3.1 OM之觀察……………………………………………..……..46
4.3.2 SEM之觀察…………………………………………………..48
4.3.3 TEM之觀察………………………………………....………..48
4.4 相同溫度下多次回火處理之比較………………………....…...50
4.4.1 OM之觀察……………………………….……………….…..50
4.4.2 SEM之觀察…………………………….………….……..…..51
4.4.3 TEM之觀察…………………………………………………..52
4.5 硬度值的觀察…………………………………………………...55
4.6 熱膨脹儀曲線的觀察…………………………………………...56
第5章 結論˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙100
第6章 建議未來工作˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙102
第7章 參考文獻˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙103
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