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研究生:游尉詩
研究生(外文):Wei-Shih You
論文名稱:沃斯回火條件對含1%Cu球墨鑄鐵腐蝕及磨耗性質之影響
論文名稱(外文):Effects of Austempering Heat Treatment on Corrosion and Wear Properties of Ductile iron Containing 1% Cu.
指導教授:許正勳許正勳引用關係
指導教授(外文):Cheng-Hsun Hsu
口試委員:許正勳
口試委員(外文):Cheng-Hsun Hsu
口試日期:2019-01-30
學位類別:碩士
校院名稱:大同大學
系所名稱:材料工程學系(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:2019
畢業學年度:107
語文別:中文
論文頁數:70
中文關鍵詞:球墨鑄鐵沃斯回火磨耗性質腐蝕性質
外文關鍵詞:Corrosion propertyDuctile ironAustemperingMechanical property
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本研究主要目的是針對添加1wt%的銅(Cu)元素之FCD450延性鑄鐵,進行不同沃斯回火條件(300℃-1hr、300℃-5hr、300℃-10hr、360℃-1hr、360℃-5hr、360℃-10hr)使成為沃斯回火延性鑄鐵材料(ADI),然後進一步探討原材DI與ADI之微觀結構、機械性質與腐蝕磨耗性質的差異,以了解不同沃斯回火條件對球墨鑄鐵腐蝕磨耗性質之影響。
實驗結果顯示,沃斯回火溫度(300℃)較低者,因其過冷度大而產生的針狀下變韌體,硬度較高、殘留沃斯田鐵含量較低、殘留沃斯田鐵碳含量較高,耐磨性質較沃斯回火溫度高(360℃)者佳。隨沃斯回火時間增長殘留沃斯田鐵含量下降,碳化物析出量上升,使其強度及耐磨性質提升。對ADI而言,可以發現ADI皆比原材DI為優,而其中300℃-10hr之ADI硬度最高、耐磨性表現最佳。另外,浸泡試驗結果,因360℃之殘留沃斯田鐵量較300℃之殘留沃斯田鐵量多,較耐腐蝕,其中360℃-1hr之ADI有最佳的耐蝕性。
In the study , 1wt% copper ductile iron (FCD450) is examined in different austempering conditions (300℃-1hr、300℃-5hr、300℃-10hr、360℃-1hr、360℃-5hr、360℃-10hr) for transferring to austempered ductile iron (ADI) respectively. Then analysis of microstructures, mechanical properties,and the mechanism of corrosive wear is made to understand different austempering conditions influence the mechanism of corrosive wear of ADI.
The results of the experiment showed the needle-shaped lower bainite generated in lower austempering temperature (300℃) has higher hardness, lower retained austenite amount, higher carbon content of retained austenite and the wear resistance is better than that in higher austempering temperature(360℃). By increasing austempering time, the retained austenite amount decreases and carbide precipitate increases,and both improve the strength and the wear resistance. The findings of the study have led to the conclusion that ADI is superior to DI, and ADI in the condition of 300℃-10hr has the higest hardness and the best wear resistance.
致謝i
摘要ii
Abstractiii
目錄iv
圖目錄vii
表目錄xi
第1章 前言1
1.1研究動機1
1.2研究目的2
第2章 文獻回顧3
2.1鑄鐵的發展3
2.1.1 添加元素合金化的影響5
2.2沃斯回火延性鑄鐵的發展6
2.3沃斯回火熱處理的製程7
2.3.1沃斯回火處理過程模擬機制12
2.4 熱處理製程窗對ADI的影響14
2.5 球墨鑄鐵之主要元素效應17
2.6 石墨型態對機械性質的影響19
2.7 ADI結構分析原理20
2.7.1 X光繞射分析20
2.7.2殘留沃斯田鐵含量21
2.7.3 殘留沃斯田鐵之碳含量22
2.8 磨耗理論23
2.8.1 磨耗型態23
2.8.2 影響磨耗的因素26
2.9 腐蝕種類與機制26
第3章 實驗方法31
3.1實驗流程31
3.2 材料製備32
3.3 沃斯回火熱處理32
3.4 金相顯微分析試驗33
3.5 X光繞射分析33
3.6 殘留沃斯田鐵含量分析34
3.7殘留沃斯田鐵含碳量分析35
3.8 硬度試驗35
3.9 磨耗試驗36
3.10 浸泡試驗37
第4章 結果與討論38
4.1 材料成分分析38
4.2 ADI顯微組織觀察38
4.3 XRD分析46
4.4 殘留沃斯田鐵含量分析47
4.5殘留沃斯田鐵含碳量分析48
4.6硬度試驗50
4.7乾式磨耗試驗51
4.8溼式磨耗試驗56
4.9浸泡試驗61
第5章 結論64
參考文獻66
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