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| 題 名 | 以電子束銲接方法探討快速凝固技術之顯微結構=Investigation of Microstructures of Rapid Solidification Using Electron Beam Welding Method |
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| 作 者 | 簡明德; | 書刊名 | 永達學報 |
| 卷 期 | 1:2 2000.08[民89.08] |
| 頁 次 | 頁137-150 |
| 分類號 | 472.14 |
| 關鍵詞 | 臨界過冷; 熱輸入量; 熱影響區; 屈氏體; 索氏體; Critical undercooling; Heat input; Heat-affected zone; Troostile; Sorbite; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 本研究以電子束銲接處理鑄體表面,使用不同熱輸入量,探討其對硬化 區顯微結構之影響,藉由快速凝固技術以改善傳統凝固的缺點,探討熔深、微觀 表面、熔區、熔線區、熱影響區之金相組織及硬度分佈,並量測枝狀間距。實驗 結果顯示在低熱輸入量時,熔深在1mm以下,熔區內結構主要是初析奧斯田體, 枝狀粒滴斑體,麻田散體,熔線區組織有針狀碳化物及白色麻田散體析出;熱影 響區有黑色麻田散體、屈氏體和索氏體。硬度測量熔區約為800-1000HV,熱影響 區為400-600HV。在高熱輸入量下,熔區內結構主要是粗化奧斯田體,退化粒滴 斑體,殘留石墨存在,熱影響區有微細波來體和索氏體。硬度測量在熔區為 600-800HV,熱影響區為300-500HV。 |
| 英文摘要 | The study aims at the cast iron surface treated by the electron beam welding todiscuss the metal hardened microstructures with different heat inputs. Disadvantagesby using traditional methods are improved by the rapid solidification technology. Thefusion depth, the fusion zone, microsurface, fusion boundary zone, metallography andhardness in heat-affected zone are probed into, as well as the dentritic arm spacingsand Vickers microhardness of each portion are measured. Experimental results showthat main structures in the fusion are proeutectoid austenite, ledeburite , small retainedgraphite at low heat inputs fusion depth below one millimeter, and white martensite,fine carbide in the flision boundary zone and dark martensite, troostite, sorbite in theHAZ. The microhardness in the fusion zone is 800-1000 HV, and that in HAZ is400-600 HV. The microstructures in the fusion zone are composed of coarse austenite,retrograde ledeburite, residual graphite and minute pearlite, sorbite under high heatinputs in the HAZ. The hardness in the fUsion zone is 600-800 HV, and that in HAZis 300-500 HV. |
本系統中英文摘要資訊取自各篇刊載內容。