Microstructure and Mechanical Properties of Permanent Mold Low-Pressure Casting and Sand Mold Gravity Casting of A357 Alloy

Qiang Li; Hai Jun Wu; Shao Ping Lu; Ling Jiao Kong; Qi Tang Hao

doi:10.4028/www.scientific.net/AMR.1004-1005.1055

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 1004-1005Microstructure and Mechanical Properties of...

Microstructure and Mechanical Properties of Permanent Mold Low-Pressure Casting and Sand Mold Gravity Casting of A357 Alloy

Abstract:

The microstructure and mechanical properties of permanent mold low-pressure casting (PMLPC) and sand mold gravity casting (SMGC) of A357 alloy were studied. The grain size of alloys formed by PMLPC is finer than that formed by sand mold gravity casting because of higher freezing rate of the former. The secondary dendrite arm spacing of PMLPC is approximately 15.2 μm (SD=4) while that of SMGC is 33.2 μm (SD=6). The ultimate tensile strength of PMLPC has a wider range from 350 MPa to 299.9 MPa and an elongation from 1.2 to 4.9. In comparison, the ultimate tensile strength of SMGC ranges from 307 MPa to 315 MPa and its elongation ranges from 2.1 to 3.7. These differences may be attributed to various factors, such as filling speed, filling pressure, and cooling rate, that affect the quality of permanent molds during the filling process.

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Periodical:

Advanced Materials Research (Volumes 1004-1005)

Pages:

1055-1061

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1004-1005.1055

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Online since:

August 2014

Authors:

Qiang Li*, Hai Jun Wu, Shao Ping Lu, Ling Jiao Kong, Qi Tang Hao

Keywords:

Low-Pressure Casting, Mechanical Property, Permanent Mold, Sand Mold

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