材料科學(xué)與工程外文文獻(xiàn)翻譯--灰鑄鐵的凝固結(jié)晶過程

1、本科畢業(yè)論文外文文獻(xiàn)及譯文文獻(xiàn)、資料題目：Solidification Of Gray Cast Iron文獻(xiàn)、資料來源：Scripta Materialia文獻(xiàn)、資料發(fā)表（出版）日期：2003.10.19院 （部）： 材料科學(xué)與工程學(xué)院專 業(yè)： 材料成型及控制工程班 級： 姓 名： 學(xué) 號： 指導(dǎo)教師： 翻譯日期： 2reveal the solidification macrostructure of

2、 DI, combined with the use of color metallography techniques that reveal the microsegregation pattern, showed that the macrostructure of DI is formed by relatively large austenite grains, that contain a very large number

3、s of graphite nodules. This was the case for hypoeutectic, eutectic, and also hypereutectic DI.The objective of this study is to investigate the solidification mechanism of GI by using the micro and macroscopic technique

4、s, successfully applied for DI in earlier studies.Experimental methods2.1. MaterialsThe melts utilized in the present study were produced by using a 50 kg medium frequency induction melting furnace. Low manganese pig i

5、ron, steel scrap and ferroalloys were used as raw materials. Melts were cast in resin bonded sand moulds to produce round bars of 20, 30 and 46 mm diameter. Table 1 lists the chemical composition of the alloys used. The

6、melts were alloyed with Cu and Ni in order to provide enough austemperability to carry out the DAAS macrography technique, which is described below.2.2. Micrographic techniqueThe color etching technique reveals the solid

7、ification microstructure through the use of a reagent that brings up the microsegregation patterns generated during solidification [12]. The etching reagent is made of 10 g NaOH, 40 g KOH, 10 g picric acid and 50 ml dist

8、illed water. It must be prepared and handled with great care, since it is caustic and toxic. Etching is carried out at 120℃ (278 F) for about 2 min.Fig. 1. Schematic illustration of the solidification unit of eutectic GI