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題名 | 低碳當量延性鑄鐵之鑄造特性及機械性質探討分析=Casting Characteristics and Mechanical Properties of Low Carbon Equivalent Ductile Iron |
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作者姓名(中文) | 方隆胤; | 書刊名 | 鑄工 |
卷期 | 23:3=94 1997.09[民86.09] |
頁次 | 頁43-52 |
分類號 | 472.2 |
關鍵詞 | 延性鑄鐵; 碳當量; 彈性係數值; 剛性; 石墨化; 沃斯田鐵樹枝狀初晶; 過熱; 補澆性; 熱裂; 顯微縮孔; 延性鑄鐵品質基本線; Ductile cast iron; Carbon equivalent; Modulus of elasticity; Stiffness; Graphitization; Primary austenite dendrite; Superheat; Feedability; Hot crack; Microshrinkage; Ductile iron quality baseline; |
語文 | 中文(Chinese) |
中文摘要 | 延性鐵鑄(亦稱球墨鑄鐵)之所以能夠成功地與其他一些製程相匹敵,是因為延 性鑄鐵本身在製造優勢及機械性質具有一獨特的組合。然而,此類材料相較於鋼為低的彈係 數值,對許多設計工程師而言實為一大隱憂,尤其當設計者試圖要降低零件重量或要增加零 件之承受應力時,問題更是顯著。 本研究之動機,是針對生產一低碳當量延性鑄鐵的可能性加以評估。降低此類合金的含 碳量,而使用與傳統球墨鑄鐵類似的處理特性,將可以改善其機械性質,其中包括了彈性係 數值的增加。這種低碳當量延性鑄鐵在成本、重量、強度及剛性的考量下,可以與鍛造鋼媲 美;汽車用曲軸、凸輪軸、連桿等均是可能的應用實例。 生產這種低碳當量延性鑄鐵(亦即含球狀石墨。無初晶碳化物,可控制基地組織的鑄鐵), 意味著其鑄造過程與一般鑄造製程有相當程度的差異。此外可以預期的是,此種較低碳當量 值將導致合金在補澆性的困難度會增加,而且較會產生熱裂、顯微縮孔等缺陷。同時,這種 合金因其液相當溫度較高,且凝固時所產生的共晶比例較低,因此其流動性也會降低。 製造這種低碳當量延性鑄鐵是可行的,但是其鑄造特性及機械性質必須加以審慎的分析 探討。 |
英文摘要 | Ductile cast irons (e.g., spheroidal graphite cast irons) production have been able to successfully compete with a variety of alternative manufacturing procedures because of the unique combination of manufacturing advantages and mechanical proper ties attainable. However, the relatively low modulus of elasticity of these alloys (compared to that of steel) has been of concern to many design engineers attempting to reduce component weight or to increase the stresses imposed upon components. Ductile iron, an improvement in mechanical properties can be realized, including an increase in Young's modulus. These low CE ductile iron would be able to compete with steel forgings on the basis of cost, weight, strength and stiffness. Automotive crankshafts, cam shafts and connecting rods would be potential applications. The production of a lower CE ductile iron (i.e., a cast iron containing spheroidal graphite, free of primary iron carbide, and with controllable matrix structures) represents a substantial deviation in foundry procedures. It can be expected that these lower CE values result in an alloy that will exhibit increased difficulty in feeding and may be susceptible to hot cracking, microshrinkage, etc. At the same time, this alloy will posses reduced fluidity due to its increased liquidus temperature and a lower fraction of eutectic developed during solidifcation. The manufacturability of this low CE alloy is feasible, but the casting characteristics and mechanical properties need to be addressed. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。