ANALISIS CACAT PENYUSUTAN DAN NILAI KEKERASAN PRODUK COR ALUMINIUM SKRAP DENGAN VARIASI UKURAN MILD STEEL CYLINDER MOLD

Nurhabibah Paramitha Eka Utami; Diah Kusuma Pratiwi; Hendri Chandra; Ellyanie Ellyanie; Gustini Gustini; Astuti Astuti

doi:10.36706/jrm.v25i1.1414

Authors

Nurhabibah Paramitha Eka Utami University of Sriwijaya
Diah Kusuma Pratiwi Jurusan Teknik Mesin Fakultas Teknik Universitas Sriwijaya
Hendri Chandra Jurusan Teknik Mesin Fakultas Teknik Universitas Sriwijaya
Ellyanie Ellyanie Jurusan Teknik Mesin Fakultas Teknik Universitas Sriwijaya
Gustini Gustini Jurusan Teknik Mesin Fakultas Teknik Universitas Sriwijaya
Astuti Astuti Jurusan Teknik Mesin Fakultas Teknik Universitas Sriwijaya

DOI:

https://doi.org/10.36706/jrm.v25i1.1414

Keywords:

casting, Aluminum scrap, molding’s diameter, hardness, shrinkage

Abstract

The research was conducted to investigate the effect of mold diameter variation on the hardness and shrinkage of cast products made from aluminum scrap. Three mold diameter variations were used in the casting process: 50 mm, 70 mm, and 100 mm. The testing methods included shrinkage measurement, Brinell hardness testing, and dye penetrant inspection. The test results showed that the 50 mm sample had the highest hardness value of 52.09 BHN and the lowest shrinkage defect of 25.25%, while the 100 mm diameter sample exhibited the lowest hardness value of 48.72 BHN and the highest shrinkage defect of 28%. This phenomenon occurred due to differences in cooling rates during the solidification process, where larger mold diameters experienced slower cooling, resulting in coarser microstructure grains and a higher occurrence of shrinkage defects.

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