Methods of gravity die casting and gravity investment casting on density, porosity, microstructure, and hardness in aluminum casting

• Main Authors: Partono, Patna, Prakoso, Dian Angga, Masyrukan, Wiyono, Sunardi, Pratiwi, Dessy Ade, Kultsum, Ummi, Istiqamah, Nur Annisa, Gustiani, Desi
• Format: Conference Proceeding
• Language: English
• Subjects: Aluminum; Beta phase; Chemical composition; Density; Die casting; Die castings; Granular materials; Microstructure; Permanent mold casting; Pistons; Porosity; Raw materials; Rockwell hardness tests; Silicon; Zirconium
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0200303

This study examines the density, porosity, microstructure, and hardness of aluminum raw materials from used pistons using gravity dies casting and gravity investment casting processes. Gravity die casting and gravity investment casting at a casting temperature of 750°C were employed in this research. Emission Spectrometry is used to determine the chemical composition of a substance (ASTM E-1251). Porosity was measured using macro photography and a digital microscope, with the findings of each mold temperature fluctuation compared. The Rockwell hardness tester is used to determine the hardness of a material (ASTM E-384). A metallographic microscope was used to examine the microstructure of the castings (ASTM E3-11). According to ASTM B-85 standards, this material comprises 71.05% (Al) composition, 13.65% (Si), 7.178% (Cu), 3.4508% (Fe), 1.7870% (Zn), and additional components up to 100%, and is categorized as Aluminum Al-Si (Aluminum-Silicon)A413.0. The density of the test object was calculated using gravity die casting at 2.6972 gr/cm3 and gravity investment casting at 2.6764 gr/cm3. The quantity of porosity impacts the density value, according to the results of porosity observations. The phase (Al) and the phase (Zr) are observed in the microstructure results (Si). In gravity investment casting, the beta phase granules (Si) appear to be larger and fewer. The beta phase granules seem smaller and more abundant in gravity die casting. The hardness value is influenced by the size, number, and dispersion of beta granules. Hardness testing with gravity investment casting yielded a hardness value of 86.84 HVN, according to the results.