Bintang, Abiyyu Winindra Pancaraning (2026) Analisis Pengaruh Efektivitas Degassing Menggunakan Gas Inert Ar dan N₂ Dengan Variasi Waktu Terhadap Densifikasi Dan Sifat Mekanik Aluminium 6061 Casting. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Proses pengecoran aluminium sering menghadapi permasalahan berupa porositas gas akibat tingginya kelarutan hidrogen pada aluminium cair yang dapat menurunkan densitas, memperburuk mikrostruktur, serta mengurangi kekuatan mekanik hasil cor. Salah satu metode yang umum digunakan untuk mengurangi kandungan gas terlarut adalah proses degassing menggunakan gas inert. Penelitian ini bertujuan untuk menganalisis pengaruh efektivitas degassing menggunakan gas argon (Ar) dan nitrogen (N₂) dengan variasi waktu 2, 3, dan 4 menit terhadap densifikasi dan sifat mekanik aluminium 6061 hasil pengecoran. Proses peleburan dilakukan sampai temperatur 750°C menggunakan metode inert gas lance degassing sebelum aluminium cair dituang ke dalam cetakan. Pada penelitian ini dilakukan pengujian meliputi Optical Emission Spectroscopy (OES), uji radiography, uji microvisual densifikasi, uji porositas, uji kekerasan Vickers, dan uji kompresi. Hasil penelitian menunjukkan bahwa penggunaan gas argon memberikan efektivitas degassing yang lebih baik dibandingkan nitrogen. Sampel dengan degassing argon selama 4 menit menghasilkan densitas tertinggi sebesar 2,647 g/cm³, persentase densifikasi mencapai 98,04%, dan porositas terendah sebesar 1,96%. Analisis mikrostruktur menunjukkan distribusi pori yang lebih sedikit dan lebih kecil dibandingkan sampel tanpa degassing serta morfologi struktur yang lebih homogen. Peningkatan kualitas mikrostruktur tersebut diikuti oleh peningkatan sifat mekanik yang ditunjukkan oleh nilai kekerasan tertinggi sebesar 98,2 HV dan compressive strength sebesar 461,61 MPa pada variasi argon selama 4 menit. Sebaliknya, sampel tanpa degassing menunjukkan densitas terendah, porositas tertinggi, serta nilai kekerasan dan kekuatan tekan yang paling rendah. Hasil penelitian menunjukkan bahwa peningkatan waktu degassing hingga 4 menit mampu meningkatkan efektivitas pengeluaran hidrogen dari aluminium cair sehingga menghasilkan peningkatan densifikasi, penurunan porositas, penyempurnaan mikrostruktur, serta peningkatan kekuatan mekanik aluminium 6061 hasil pengecoran.
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ng process often faces problems in the form of gas porosity due to the high solubility of hydrogen in molten aluminum, which can reduce density, degrade microstructure, and decrease the mechanical strength of the castings. One commonly used method to reduce dissolved gas content is the degassing process using inert gases. This study aims to analyze the effectiveness of degassing using argon (Ar) and nitrogen (N₂) for durations of 2, 3, and 4 minutes on the densification and mechanical properties of cast 6061 aluminum. The melting process was carried out up to a temperature of 750°C, followed by degassing with an inert gas before the molten aluminum was poured into the mold. In this study, a series of tests were conducted, including Optical Emission Spectroscopy (OES), radiographic testing, microvisual densification testing, porosity testing, Vickers hardness testing, and compression testing. The results showed that the use of argon gas provided better degassing effectiveness compared to nitrogen. Samples subjected to 4 minutes of argon degassing yielded the highest density of 2.647 g/cm³, a densification percentage of 98.04%, and the lowest porosity of 1.96%. Microstructural analysis revealed a lower number of pores and smaller pore sizes compared to samples without degassing, as well as a more homogeneous structural morphology. This improvement in microstructural quality was accompanied by enhanced mechanical properties, as evidenced by the highest hardness value of 98.2 HV and compressive strength of 461.61 MPa in the 4-minute argon degassing treatment. Conversely, the sample without degassing exhibited the lowest density, the highest porosity, and the lowest hardness and compressive strength values. The research results indicate that increasing the degassing time to 4 minutes enhances the removal of hydrogen from molten aluminum, thereby improving densification, reducing porosity, refining the microstructure, and increasing the mechanical strength of cast 6061 aluminum.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | degassing, porositas, pengecoran casting, degassing, porosity |
| Subjects: | Q Science > QC Physics > QC111 Density and specific gravity Q Science > QC Physics > QC151 Fluid dynamics Q Science > QC Physics > QC320 Heat transfer |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Abiyyu Winindra Pancaraning Bintang |
| Date Deposited: | 17 Sep 2026 06:18 |
| Last Modified: | 17 Sep 2026 06:18 |
| URI: | http://repository.its.ac.id/id/eprint/137784 |
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