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題 名 | 變溫式沃斯回火製程對延性鑄鐵機械性質之影響=Effect of Variable Austempering Temperature Process on Mechanical Properties of Ductile Iron |
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作 者 | 許正勳; 李俊穎; 韓濟帆; | 書刊名 | 鑄造工程學刊 |
卷 期 | 34:1=136 2008.03[民97.03] |
頁 次 | 頁1-7 |
分類號 | 454.86 |
關鍵詞 | 非恆溫沃斯回火; 延性鑄鐵; 顯微組織; 機械性質; Variable austempering temperature; Ductile iron; Microstructure; Mechanical property; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究嘗試利用兩種非恆溫沃斯回火製程(持續升溫及持續降溫)方式處理延性鑄鐵,再進一步與傳統恆溫沃斯回火處理者做比較,以探討是否可藉由此變溫式沃斯回火熱處理來提升其機械性能。實驗結果顯示:相較於傳統之恆溫沃斯回火製程,不論是持續升溫(300→360℃)或持續降溫(360→300℃)方式對其顯微組織影響不大,但對殘留沃斯田鐵(γ[8ed0])之碳含量有影響,即前者會減少γ[8ed0]碳含量(1.98→1.64%C)而後者會增加γ[8ed0]碳含量(1.95→2.19%C)。在機械性質方面,持續升溫(300→360℃)方式可提升ADI之硬度和抗拉強度,而持續降溫(360→300℃)方式則可增加衝擊韌性和破裂韌性(K[9275]值)。 |
英文摘要 | In this study, two types of variable austempering temperature processes were utilized to treat ductile iron for further exploring the effects of the non-isothermal heat treatment on mechanical properties of austempered ductile iron (ADI). In the first route, the specimens after 910℃-1.5hrs austenitization were quenched into a salt bath held at 300℃ then progressively heated to 360℃. In the second route, the austenitized specimens were else quenched into a salt bath held at 360℃ then steadily cooled to 300℃. The results showed that both obtained ADIs almost had the same microstructures after the above austempering treatments, but carbon content in retained austenite was changed as compared to isothermal-treated ADI. The austempering process with temperature increasingly (300→360℃) resulted in a decrease of the carbon content (1.98→1.64%C), while another process (360→300℃) resulted in an increase of the carbon content (1.95→2.19%C). In the case of mechanical properties, the first process (300→360℃) generated the better hardness and strength, the last one (360→300℃) had an increment in impact toughness and K[9275] value. |
本系統中英文摘要資訊取自各篇刊載內容。