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研究生:羅文駿
研究生(外文):WEN-CHUN LO
論文名稱:IF鋼之疲勞顯微組織研究
論文名稱(外文):The observation of low cycle microstructure of IF steel
指導教授:何扭今何扭今引用關係
學位類別:碩士
校院名稱:國立中山大學
系所名稱:材料科學研究所
學門:工程學門
學類:材料工程學類
論文種類:學術論文
畢業學年度:91
語文別:中文
論文頁數:82
中文關鍵詞:IF鋼疲勞
外文關鍵詞:IF steelfatigue
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論文題要內容:
本文是以含碳量極低的IF鋼做疲勞顯微組織研究;在本文中分別對70µm 、210µm之棒試皆以2.0%、1.0%、1.6%、0.8%、0.6%、0.4%、0.3%、0.2%、0.1%、0.05%的應變振幅作用,觀察內部的疲勞顯微組織研究,並由實驗結果可分別得到70µm 、210µm之週期應力 v.s. 應變反應曲線、Basqin-Coffin-Manson 曲線(應變振幅v.s. 疲勞壽命)、週期應力 v.s. 應變曲線圖、應力振幅v.s. 塑性應變幅度曲線,另外,由TEM觀察得知,從0.1%應變振幅開始,所觀察到的內部差排組織皆為差排胞;此外,在1.6%應變振幅作用前,週期應力 v.s. 應變反應曲線都會呈現軟化的現象,超過1.6%應變振幅才開始有硬化的現象產生;在實驗中並發現,應變振幅越大,產生的塑性變形也越大,當所受應變振幅為0.3%以上時,所產生的彈性變形將小於所產生的塑性變形。IF鋼的兩種晶粒無論是受大的應變振幅或小的應變振幅作用,初期都會很快的產生差排牆進而快速發展成差排胞。IF鋼的兩種晶粒若遭受的應變振幅越小,則所產生的差排胞越大,而且差排胞大小差異越小;若其遭受越大的應變振幅作用時,所產生的差排胞則越小,差排長軸和短軸的差異也越大。IF鋼在應變振幅為0.4%、0.3%、0.2%作用時,兩種晶粒都會出現先軟化然後再硬化的情況,但70μm的情況較為明顯。IF鋼在超過應變振幅1%作用時,70μm的n’大於210μm的n’,也就是有較大的硬化率。由‘應力振幅v.s.塑性應變幅度’圖中得知,70μm及210μm皆沒有平原區的存在。
Abstract
IF steel with two grain sizes ( 70μm and 210μm ) strain amplitude of 2%、1.6%、1%、0.8%、0.6%、0.4%、0.3%、0.2%、0.1%、0.05% were fatigued in order to obtain basic fatigue properties. By use TEM , we can know that we can observe dislocation cells from Δεt = 0.05% ~Δεt = 2% . When Δεt > 1.6% , hardening will occur , if not , softening will be observed . The more strain amplitude is , the more plastic deformation will be observed . WhenΔεt > 0.3% , the elastic deformation will smaller than plastic deformation . WhenΔεt =0.2% ~Δεt = 0.4% , we can observe secondary hardening from the specimen of 70μm . When Δεt > 1% , the n’ of 70μm is more than the n’ of 210μm , that means the specimen of 70μm has bigger hardening . By the ‘ Stress amplitude v.s. Plastic deformation amplitude ’ plot of 70μm and 210μm , we can know that there is no ‘ pleatue ’ . The more strain amplitude is , the more difference between long axis and short axis of dislocation cell will occur .
目錄

壹、前言…………………………………………………………………..7
1.1 背景…………………………………………………………….7
1.2 研究動機與目標……………………………………………….8
貳、文獻回顧……………………………………………………………10
2.1 BCC材料的內部差排行為……………………………………10
2.2 BCC材料的硬化及軟化………………………………………15
2.3 裂痕起始和成長……………………………………………...21
叁、實驗方法…………………………………………………………..23
3.1 材料選擇與處理……………………………………………...23
3.2 疲勞實驗試棒製作…………………………………………...23
3.3 疲勞實驗……………………………………………………...24
肆、實驗結果與討論……………………………………………………26
4.1 疲勞硬化-軟化曲線…………………………………………..26

4.2 Basqin-Coffin-Manson plot……………………………………31

4.3 內部差排結構的觀察與分析….……………………………..36
伍、結論……….…………………………….…………………………..44
陸、參考文獻……………………………………………………………46
柒、表…………………………………………………………..………..48
捌、圖……………….…………………………………………………...54
陸、參考文獻

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