Telah dilakukan pengembangan boogie wheel tank AMX-13 untuk komponen kendaraan tempur tank jenis ringan. Tujuan pengembangan yang dilakukan dalam penelitian ini adalah membuat prototip boogie wheel dari material aluminium AC4C (Standar JIS) melalui proses pengecoran dan perlakuan panas sebagai upaya meningkatkan kemampuan teknologi dan produksi industri pertahanan dalam negeri agar dapat membantu mengurangi ketergantungan TNI terhadap impor komponen boogie wheel. Keunggulan dari invensi ini, yaitu: (1) mengurangi berat total tank AMX-13 karena boogie wheel yang dibuat sebelumnya menggunakan material baja, (2) dihasilkan boogie wheel yang mempunyai kekuatan yang setara produk aslinya, dan (3) menurunkan waktu pembuatan dan biaya produksi bila dibandingkan menggunakan proses tempa. Berdasarkan hasil percobaan yang dilakukan diketahui bahwa faktor-faktor yang menentukan kualitas produk boogie wheel yang dibuat adalah: (1) dies boogie wheel, (2) pemaduan material, (3) proses peleburan dan penuangan, dan (4) proses perlakuan panas. Dengan dikuasainya teknologi pengecoran dan perlakuan panas, maka dapat dikembangkan pembuatan boogie wheel untuk jenis tank lainnya.
Al-Si alloys are being widely used as main engine components replacing iron in several parts in the automotive industry. Some of its mechanical properties were a reference in its alloy utilization. In this research, the heat treatment carried out on the specimen included solid solution treatment and the artificial aging process for aluminium alloys. Test pieces were heated on the furnace with a solid solution treatment process at 540 ° C with holding time around 5 hours and quenched at 60 °C with water quenchant, followed by 3 different aging treatment which included single-stage aging, artificial aging with pre-aged, and double stage aging. Tests carried out by hardness test, tensile strength test, impact test, metallographic and Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDS) observations. The results of this research showed the differences in phase constituent and morphology microconstituents due to variations of aging. The difference of each treatment could be seen in the morphology of the precipitate that is dispersed, rounded and needle-like shaped, this phase can influence the mechanical properties of Al-Si-Cu alloys. The results of mechanical testing show the highest hardness was obtained by double stage aging treatment 161.27 HRB. The highest tensile strength occurs in specimens with a single-stage aging treatment of 202.56 MPa. The highest impact resistance occurred in samples with the pre-aging treatment of 18.6 J.
AbstrakIndonesia menjadi salah satu negara dengan konsumsi aluminium terbesar, salah satunya untuk komponen bogie tank baja. Upaya pembuatan roda bogie wheel telah dilakukan dengan berbagai metode, salah satunya adalah proses pengecoran. Untuk memenuhi spesifikasi teknis tersebut, bogie hasil pengecoran harus dikenai proses heat treatment agar memiliki sifat mekanik yang memadai. Dalam penelitian ini dilakukan variasi waktu holding proses artificial aging selama 2, 3, 4, dan 5 jam. Pengujian yang dilakukan berupa uji metalografi, pengujian tarik, dan pengujian impak. Hasil dari pengujian, didapatkan bahwa kekuatan tertinggi adalah sebesar 193,08 MPa yang dicapai oleh spesimen aluminium dengan waktu holding proses artificial aging selama 5 jam. Ketahanan impak tertinggi adalah sebesar 2,55 Joule yang dicapai oleh spesimen aluminium dengan waktu holding proses artificial aging selama 5 jam. Presipitat yang terbentuk pada hasil artificial aging berupa presipitat AlSi yang halus, membulat dan membentuk kluster. AbstractIndonesia is one of the countries with the largest aluminum consumption, particularly for bogie tracklink tank components. The efforts to make bogie wheel wheels have been carried out with various methods, including the casting process. There are some technical specifications to support bogie on its application, bogies from casting must be subjected to a heat treatment process in order to have adequate mechanical properties. In this research, the variation of holding time of the artificial aging process was 2, 3, 4, and 5 hours. Tests carried out in the form of metallographic, tensile strength testing, and impact testing. It was found that the highest strength was 193.08 MPa which was achieved by aluminum specimen with holding time for the artificial aging process for 5 hours. The highest impact resistance is 2.55 Joules which is achieved by aluminum specimens with a holding time of the artificial aging process for 5 hours. Precipitates that are formed on the results of artificial aging are AlSi precipitates with smooth, rounded and clustered shape.
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