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Technical Briefs

Cast-In Hypereutectic Aluminum Liners for Engine-Blocks

[+] Author and Article Information
Fernando Morales, José Talamantes-Silva

 Nemak, Sociedad Anónima de Capital Variable, Libramiento Arco Vial km 3.8, García, 66000 Nuevo León, Mexico

Salvador Valtierra

 Owens Corning, Privada La Puerta 1110-A, Santa Catarina, 66350 Nuevo León, Mexico

Alberto J. Pérez-Unzueta, Rafael Colás

Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, Apartado Postal 149-F, San Nicolás de los Garza, 66451 Nuevo León, Mexico

J. Manuf. Sci. Eng 131(1), 014502 (Jan 20, 2009) (4 pages) doi:10.1115/1.3063691 History: Received June 30, 2008; Revised December 05, 2008; Published January 20, 2009

A series of experimental trials was carried out to study the metallic bond produced when hypereutectic aluminum liners are cast-in hypoeutectic aluminum engine-blocks. The samples were cast in a rig that reproduces the conditions encountered during production of engine-blocks made of a type 319 aluminum alloy. The surface roughness of the liners was modified by sand blasting before casting. Some of the liners were cast after coating their surface with an amorphous carbon layer (soot) to study its effect on the metallic bond. The samples were sectioned and prepared for their examination and testing. It was found that soot does not allow the development of a metallic bond between liner and body and that the force required to remove the liners depended on such a bond; in any case, the force required to remove cast-in liners, even without bonding, was higher than that needed for removing gray iron press-in liners.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematics of the conditions encountered within combustion chambers of engine-blocks

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Figure 2

Deposition of soot with an oxyacetylene torch

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Figure 3

Testing procedure and tooling used to remove the liners from their surrounding material

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Figure 4

Light optical micrograph of the hypereutectic alloy

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Figure 5

Light optical micrograph of the hypoeutectic A319 alloy

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Figure 6

Profiles recorded in liners subjected to either light (a) or severe (b) sand blasting

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Figure 7

Ratio of the roughness modified by blasting (RaMD) over the as-received values (RaAR) as a function of these last values

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Figure 8

Light optical microscopy images of the region between the hypereutectic aluminum liner (above) and the surrounding A319 alloy (below) for as-received ((a) and (b)) and severe blasting ((c) and (d)). Liners in (c) and (d) were coated with soot.

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Figure 9

Load-displacement curves for samples tested under different conditions

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Figure 10

Partial removal of a hypereutectic sooty liner

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Figure 11

Pores detected in cast-in liners

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Figure 12

Si and Al2Cu particles in liners before (a) and after (b) casting

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