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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 陳永傳 | |
dc.contributor.author | Wen-An Cheng | en |
dc.contributor.author | 鄭文安 | zh_TW |
dc.date.accessioned | 2021-06-15T11:23:30Z | - |
dc.date.available | 2021-08-31 | |
dc.date.copyright | 2016-08-31 | |
dc.date.issued | 2016 | |
dc.date.submitted | 2016-08-17 | |
dc.identifier.citation | 參考文獻
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/49319 | - |
dc.description.abstract | 本研究使用JIS SKD61的規範鋼種以及改良鋼種作為實驗材料,並在固定的淬火溫度(1020 oC)以及持溫時間下(1hr),用不同的冷卻速率進行淬火,淬火時將其冷卻過程分為三個階段,分別為高溫區(1020oC~700oC)、中溫區(700oC~500oC)、低溫區(500oC~300oC),為了模擬現場淬火作業厚度大於300mm之模具中心實際的溫度變化歷程,依照各鋼種的CCT曲線圖推測出適當的淬火冷速作為初始條件,並以每次只改變其中一個溫度區間的淬火冷速的方式將冷速降為初始條件的2/3或1/2,淬火後的試片接著回火至相同的目標硬度HRC47±_1^(0.5),之後比較衝擊值,並以光學顯微鏡、SEM分析各試片的顯微組織與化學組成,探討各溫度區間冷速調降對衝擊韌性的影響。
研究結果顯示,各鋼種以低溫區冷速調降的條件淬火時最容易造成衝擊值下降,其次為高溫區冷速調降的條件,而以中溫區冷速調降的條件淬火後則對衝擊值影響不大。此外,原材組織中若有數量較多且粗大的網狀碳化物、碳化物顆粒、以及數量較多的巨觀非金屬夾雜物(20µm以上),將會導致含有這些組織的鋼種在以各條件淬火回火後,衝擊值會有明顯的下降。 | zh_TW |
dc.description.abstract | This study used the steel of JIS SKD61 and the improved steel as experimental materials. The quenching temperature (1020℃) and holding time (1hr) were fixed for quenching at different cooling rates. The cooling process was divided into three stage during quenching, which are the high temperature range (1020℃~700℃), moderate temperature range (700℃~500℃) and low temperature range (500℃~300℃). In order to simulate the actual temperature change in the mold center thicker than 300mm in the field quenching operation, the appropriate quenching cooling rate was reasoned from the CCT curve diagram of various steel grades as the initial condition. The quenching cooling rate of only one temperature interval was changed each time to reduce the cooling rate to 2/3 or 1/2 of initial condition. The quenched sample was tempered to the same target hardness HRC47±_1^(0.5) for impact test to compare the impact values. The microstructure and chemical composition of various samples were analyzed by optical microscope and SEM. The effect of reducing the temperature interval cooling rates on the impact toughness was discussed.
The findings showed that the impact value is most likely to decrease when various types of steel are quenched in the condition of low temperature range cooling rate scale down, and then in the condition of high temperature range cooling rate scale down. The quenching in the condition of moderate temperature range cooling rate scale down has slight effect on the impact value. In addition, if the raw material structure contains considerable and continuous net carbide, as well as considerable macroscopic nonmetallicinclusions (above 20μm), the impact value of the steel containing these structures decreases markedly after quench tempering under various conditions. | en |
dc.description.provenance | Made available in DSpace on 2021-06-15T11:23:30Z (GMT). No. of bitstreams: 1 ntu-105-R03522729-1.pdf: 13630204 bytes, checksum: 66398fd6b5a55d786b8091e9b8699606 (MD5) Previous issue date: 2016 | en |
dc.description.tableofcontents | 目 錄
誌 謝 I 摘 要 II ABSTRACT III 目 錄 IV 圖目錄 VI 表目錄 XIII 第一章 緒 論 1 1.1前 言 1 1.2實驗動機與目的 1 第二章 文獻回顧 2 2.1 熱處理 2 2.1.1 淬火 2 2.1.2回火 3 2.1.3淬火條件與回火條件的選擇 4 2.2 添加合金元素對熱處理及機械性質的影響 4 2.3 原材顯微組織對機械性質的影響 5 2.3.1 合金碳化物的影響 5 2.3.2 巨觀偏析與微觀偏析 6 2.3.3 非金屬夾雜對韌性的影響 7 2.4 淬火後變韌鐵形貌對韌性的影響 7 第三章 實驗設備與方法 8 3.1 實驗規劃 8 3.2實驗設備 8 3.2.1 溫度量測及記錄設備 8 3.2.2 淬火設備 9 3.2.3 回火設備 9 3.2.4 元素分析以及顯微組織觀察所用儀器 9 3.3實驗方法 10 3.3.1 溫度校正 10 3.3.2 淬 火 10 3.3.3 回 火 10 3.3.4 維克氏微硬度測試 11 3.3.5 金相組織觀察 11 3.3.6 衝擊試驗 11 第四章 結果與討論 13 4.1各鋼種原材顯微組織觀察 13 4.2各鋼種淬火後硬度分析 14 4.3各鋼種淬火後顯微組織觀察 15 4.4各鋼種淬火回火後顯微組織觀察 21 4.5各鋼種淬火回火後之衝擊韌性 25 第五章 結 論 28 參考文獻 141 附錄 144 | |
dc.language.iso | zh-TW | |
dc.title | 不同溫度區間的淬火冷速對熱作工具鋼衝擊韌性的影響 | zh_TW |
dc.title | Effects of Different Quenching Cooling Rates at Different Temperature Ranges on Impact Toughness of Hot Work Tool Steels | en |
dc.type | Thesis | |
dc.date.schoolyear | 104-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 黃振賢,周挺正 | |
dc.subject.keyword | 熱作工具鋼,淬火,機械性質,衝擊值, | zh_TW |
dc.subject.keyword | Hot work tool steel,Quenching,Mechanical properties,Impact value, | en |
dc.relation.page | 149 | |
dc.identifier.doi | 10.6342/NTU201602680 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2016-08-18 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 機械工程學研究所 | zh_TW |
顯示於系所單位: | 機械工程學系 |
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