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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.42  No.9 (2001)  >  pp.1952-1958

MATERIALS TRANSACTIONS
<<Previous article Vol.42  No.9 (2001)   pp.1952 - 1958 Next article>>

Microstructural Characteristics and Wear Resistance of Electromagnetic Casting Aluminum Alloys

Sug-Won Kim1), Hai Hao1), Ui-Jong Lee1), Kee-Do Woo1) and Jun-Ze Jin2)
1) Division of New Materials Engineering, Research Institute of Advanced Materials Development,Chonbuk National University
2) Research Center of Foundry Engineering, Dalian University of Technology


Direct chill casting (DCC) has some demerits such as oscillation and subsurface segregation. Electromagnetic casting (EMC) technology was used to solve these problems. The electromagnetic force prevented the metal from touching the mold, which contributes to leaving the ingot surface very smooth. Moreover, the electromagnetic stirring and joule heating made the structure become more homogeneous over the entire cross-section. It results in the EMC ingots having distinct merits.The 2024 and 5182 Al alloys were made using EMC and DCC technology. Parts of them were used for specimens. OM and SEM were carried out to analyze the microstructures. Hardness and wear resistance tests were carried out in order to investigate mechanical properties. On the other hand, the solution and aging treatment effects on mechanical charaterization were compared between EMC and DCC ingots. Micrographs show that EMC ingots have a very fine and uniform grain structure, which makes the EMC ingots have high strength and good ductility. The EMC specimens have twice the hardness of DCC specimens in the as-cast state. They also express excellent wear resistance characteristics.


Keyword:
electromagnetic casting, direct chill casting, aluminum alloys, microstructure, wear resistance

Received: February 19, 2001
Accepted: July 03, 2001 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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