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Metalurgi

metalurgi
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Published by BRIN Publishing

ISSN : 01263188 EISSN : 24433926 DOI : 10.55981/metalurgi

Core Subject : Science, Engineering,

Industrial & Manufacturing Engineering Materials Science & Nanotechnology

The objective of this journal is the online media for disseminating results in Research and Development and also as a media for a scientist and researcher in the field of Metallurgy and Materials. The scope if this journal related on: Advanced materials and Nanotechnology Materials and Mineral characterization and Analysis Metallurgy process: extractive Ceramic and composite Corrosion and its technological protection Mineral resources manifestation Modelling and simulation in materials and metallurgy Engineering Metallurgy instrument

Arjuna Subject : Ilmu Material (semua kategori) - Ilmu Material (Lain-Lain)

Articles 287 Documents

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SIFAT MEKANIK DAN STRUKTUR MIKRO PELAT TIPIS Zn HASIL ROL DINGIN UNTUK APLIKASI ANODA KORBAN Saefudin Saefudin; Galih Senopati
Metalurgi Vol 29, No 2 (2014): Metalurgi Vol.29 No.2 Agustus 2014
Publisher : National Research and Innovation Agency (BRIN)

PERCOBAAN PENDAHULUAN PERBANDINGAN DAYA SERAP UNSUR MINOR DALAM LARUTAN NATRIUM SILIKAT[Preliminary Comparative Study on the Adsorption of Minor Elements in Sodium Silicate Solution] Felix Firdiyono; Murni Handayani; Eko Sulistiyono; Iwan Dwi Antoro
Metalurgi Vol 27, No 1 (2012): Metalurgi Vol. 27 No. 1 April 2012
Publisher : National Research and Innovation Agency (BRIN)

Characterization and Analysis of Hardness, Microstructure, and Crystallography of SS 304-Sheathed MgB2 Superconducting Wires Rivai, Rizky Ramadhani; Pramono, Andika Widya; Priyanto, Tri Hardi; Maghfirah, Awan
Metalurgi Vol 38, No 1 (2023): Metalurgi Vol. 38 No. 1 2023
Publisher : National Research and Innovation Agency (BRIN)

This research was conducted to analyze the hardness, microstructural morphology, and crystallography of the MgB2 compound in the form of a SS 304-sheathed superconducting wire. MgB2 superconducting wire with SS 304 outer sheath was manufactured using an ex-situ rolling process. The results of the Vickers hardness test with a load of 0.3 N showed the MgB2 hardness value of 355.1 HV. The results of observations with SEM-EDS (scanning electron microscopy-energy dispersive spectroscopy) showed the agglomerations of the second phase of (Mg)B-O with various compositions due to the rolling process. There was also a longitudinal crack in the MgB2 area due to the work-hardening phenomenon in the brittle MgB2 solid. There were no obvious Bragg peaks in the MgB2 phase. The detected Bragg peaks came from the austenitic (g-Fe) of SS 304-sheath.

MORFOLOGI STRUKTUR DAN KARAKTERISTIK SIFAT MEKANIK SERTA KEAUSAN BAJA BAINIT DENGAN VARIASI MANGAN HASIL NORMALISING UNTUK TAPAK KENDARAAN TEMPUR [Morphology The Structure And Mechanical Properties And Wear of Normalizing Bainitic Steel With Various Manganese For Track Link of Combat Vehicle] Sri Bimo Pratomo
Metalurgi Vol 30, No 2 (2015): Metalurgi Vol.30 No.2 Agustus 2015
Publisher : National Research and Innovation Agency (BRIN)

Tapak rantai impor yang digunakan untuk kendaraan tempur menggunakan baja bainite. Baja bainite digunakan secara luas karena memiliki sifat yang keras tetapi tangguh. Untuk memperbaiki sifat mekanis produk cor, umumnya dilakukan proses perlakuan panas normalisasi. Tahap akhir dari proses normalisasi adalah proses pendinginan yang sangat mempengaruhi morfologi struktur mikro. Pengaruh mangan terhadap pembentukan struktur bainite saat ini masih dalam perdebatan. Tujuan dari penelitian ini adalah untuk mengamati pengaruh kadar mangan dan perbedaan proses pendinginan terhadap struktur mikro, kekerasan dan ketahanan aus dari tapak rantai yang terbuat dari baja bainite. Disebabkan karena terbentuknya massive bainitic ferrite maka kekerasan dan ketahanan aus prototipe tapak rantai yang mengandung 2% mangan menjadi lebih tinggi dibandingkan dengan yang hanya mengandung 1% mangan. Pada prototipe tapak rantai yang mengandung 1% mangan dan dinormalisasi dengan pendinginan kipas angin, akan menghasilkan struktur mikro compact bainitic ferrite, dengan nilai kekerasan dan ketahanan aus yang lebih baik bila dibandingkan dengan tapak rantai impor; yaitu 31 HRC, 0,28% dan 28 HRC, 0,52%, masing-masing untuk tapak rantai prototipe dan impor. Struktur mikro dari compact bainitic ferrite memperlihatkan morfologi yang lebih baik bila dibandingkan dengan struktur mikro massive bainitic ferrite. AbstractImported track link for combat vehicle uses bainitic steel. Bainitic steels are widely used because they exhibithard but tough. To improve the mechanical properties of casting product generally are performednormalizing heat treatment. The final stage of normalizing namely cooling process greatly affects the changeof microstructure morphology. Effect of manganese in the formation of bainitic structure is still debated. Thepurpose of this study was observing effect the manganese content and effect the various cooling process ofbainitic steel track link on microstructures, hardness and abrasive resistant. Due to the formation of massivebainitic ferrite, the hardness and abrasive resistance of track link prototype containing 2% manganesebecomes higher compared with track link prototype contains only 1% manganese. The track link prototypecontaining 1% manganese and normalized by the cooling fan, produced the microstructure of compactbainitic ferrite that has hardness and abrasive resistance was better compared to imported track link; ie 31HRC, 0.28% and 28 HRC, 0.52%, respectively for the track link prototype and imported track link. Compactbainitic ferrite microstructure showed better morphology compared to the massive bainitic ferritemicrostructure.

FATIGUE FAILURE IN A LONGITUDINAL WELDED ELBOW OF A PROCESSING VESSEL D.N. Adnyana
Metalurgi Vol 36, No 3 (2021): Metalurgi Vol. 36 No. 3 Desember 2021
Publisher : National Research and Innovation Agency (BRIN)

A longitudinal welded elbow made of austenitic stainless steel type 316 and used as a drain line on a processing vessel had suffered damage (leakage) after it had only been in operation for a few years. Process fluid that was drained out of the vessel consists of fatty acid containing hydrogen gas at a temperature of 150°C and a pressure of 60 bar(g). Initially, the drain process was carried out only once a year, but recently due to frequent changes in the types of product being made, the frequency of drain process has increased to several times a month. This study aims to determine the type and factors that have caused leakage in the elbow. Metallurgical assessment was carried out by preparing a number of specimens from the leaking elbow. A number of laboratory examinations were performed including visual and macroscopic tests, chemical composition analysis, metallographic examination, hardness tests and scanning electron microscopy (SEM) equipped with energy-dispersive spectroscopy (EDS) analysis. The results obtained indicate that the leaking elbow has experienced fatigue failure due to cyclic loadings caused by the increasing frequency of the number of drain processes carried out through the elbow. The factor causing fatigue failure at the elbow is likely due to welding defect of imperfect shape that formed on the inner wall of the elbow around the HAZ (heat-affected zone)/fusion boundary, and causing high stress concentrations in that area.

PENGARUH UNSUR Ni, Cr DAN Mn TERHADAP SIFAT MEKANIK BAJA KEKUATAN TINGGI BERBASIS LATERIT Rahardjo Binudi; Bintang Adjiantoro
Metalurgi Vol 29, No 1 (2014): Metalurgi Vol.29 No.1 April 2014
Publisher : National Research and Innovation Agency (BRIN)

Uranium removal from tin smelter slag by bisulfate fusion and acidic leaching Erik Prasetyo Prasetyo; Sonia Saraswati Meiliastri; Kurnia Trinopiawan; Yayat Iman Supriyatna; Fathan Bahfie; Giyatmi Giyatmi
Metalurgi Vol 35, No 1 (2020): Metalurgi Vol. 35 No. 1 April 2020
Publisher : National Research and Innovation Agency (BRIN)

Slag as secondary product (waste) of tin smelter still contains not only valuable elements e.g. Ti, Nb, Ta, Zr, Hf and rare earth elements, but also radioactives such as Th and U, wich are accumulated in the slag phase during the smelting. Due to valuable element content, the slag becomes major of interest in mineral processing industries, hence the slag needs to be decontaminated before it could be processed further.Common approach to reduce U content from the slag using leaching process is considered ineffective due to association of U with refractory elements e.g. Si and Ti in the slag. To break down the refractory phases, the fusion approach by using fusing agent is required in order to release U so that they could be leached out using mild lixiviant.In this research, potassium hydrogen sulfate (KHSO4) and sulfuric acid was used as fusing agent and lixiviant, respectively. The parameters studied includes molar ratio between fusing agent and refractory elements in slag, fusion temperature, fusion time, sulfuric acid concentration in lixiviant and pulp density during leaching stage. The studies so far demonstrated that optimum condition in U removal occurred at fusion temperature 400 °C, fusion time 2 hours, molar ratio of potassium hydrogen sulfate to tin slag 5, sulfuric acid concentration 2 M and pulp density 15 ml/gr. The maximum recovery of U was 85.6%, which was significant compared to the results using direct leaching without fusion (0.1%).

STUDI PERBANDINGAN EFEK FOTOKATALISIS Fe2O3-TiO2 HASIL EKSTRAKSI ILMENIT BANGKA DAN P-25 DEGUSSA UNTUK APLIKASI PENGOLAHAN LIMBAH CAIR TPA CILOWONG[The Photocatalytic Effect of P-25 Degussa and Fe2O3-TiO2 Derived from Bangka- Indonesia Ilmenite Extraction for Waste Water Treatment of Leachate on the Landfill Cilowong] Latifa Hanum Lalasari; Akhmad Herman Yuwono; Firdiyono Firdiyono; Lia Andriyah; Elfi N; Sri Harjanto; Bambang Suharno
Metalurgi Vol 27, No 3 (2012): Metalurgi Vol.27 No.3 Desember 2012
Publisher : National Research and Innovation Agency (BRIN)

Peningkatan Kadar Nikel Dalam Laterit Jenis Limonit Dengan Cara Peletasi, Pemanggangan Reduksi Dan Pemisahan Magnet Campuran Bijih, Batu Bara, Dan Na2SO4 [Upgrading of Nickel Content in The Limonitic Laterite Ores by Pelletizing, Reduction Roasting and Magnetic Separation of The Mixed Ores, Coal and Sodium Sulphate] Rudi Subagja; Agus Budi Prasetyo; Wahyu Mayang Sari
Metalurgi Vol 31, No 2 (2016): Metalurgi Vol. 31 No. 2 Agustus 2016
Publisher : National Research and Innovation Agency (BRIN)

In Indonesia, laterite nickle ore that is low grade nickel (<1.5%) has not been used well because it is not considered beneficial. At present work, the experiment to increase nickel grade in the limonitic type of laterite ores has been caried out by pelletizing a limonitic type of laterite ores, coal and Na2SO4 mixture, it was followed with reduction roasting of pellet in muffle furnace at temperatues 800 ºC to 1100 ºC and reduction roasting time from 0,5 hours to 4 hours. The reduced ore from reduction roasting process was grounded in vibrating mill, then mixed with water and passed to magnetic separator to separate nickel concentrates from the tailing. The concentrate with 10.28% of nickel grade and 66,57% of iron grade was produced from hour, 10 % of coal addition and 20% of Na2SO4 addition with recovery of nickel and iron in the consentrate 64,77% and 34,66% respectively.AbstrakPada penelitian ini telah dilakukan percobaan untuk meningkatkan kadar nikel dalam bijih nikel laterit jenis limonit dengan cara membuat pelet dari campuran bijih nikel laterit jenis limonit, batubara dan natrium sulfat, dilanjutkan dengan pemanggangan reduksi pelet dalam tungku mufle pada temperatur 800 0 C sampai dengan 1100 o C dan waktu pemanggangan reduksi dari 0,5 jam sampai dengan 4 jam. Kalsin yang dihasilkan dari proses pemanggangan kemudian digiling dalam vibrating mill untuk selanjutnya dicampur dengan air dan dilewatkan kedalam alat pemisah magnet sehingga dihasilkan konsentrat dan tailing. Konsentrat dengan kadar nikel 10,28 % dan kadar besi 66,57 % diperoleh dari kalsin hasil proses pemanggangan reduksi pada temperatur 1000 o C selama 1 jam, penambahan batubara 10 % dan penambahan natrium sulfat 20 %, dimana perolehan nikel dan besi dalam konsentrat masing masing adalah 64,77 % dan 34,66 %

MORPHOLOGY AND RESISTIVITY VALUE OF FLOURINE-DOPED TIN OXIDE (FTO) USING INDONESIAN LOCAL DIMETHYLTIN DICHLORIIDE (DTMC) PRECURSORS Rizki, Apti Mira; Yunita, Fariza Eka; Lalasari, Latifa Hanum; Irawan, Januar; Arini, Tri; Firdiyono, Florentinus; Andriyah, Lia; Natasha, Nadia Chrisayu; Yuwono, Akhmad Herman
Metalurgi Vol 37, No 3 (2022): Metalurgi Vol. 37 No. 3 Desember 2022
Publisher : National Research and Innovation Agency (BRIN)

Transparent Conductive Oxide (TCO) is the main component for solar cell fabrication. One of the promising types of TCO is fluorine-doped tin oxide (FTO). The method used in depositing the conductive layer of FTO is spray pyrolysis with an ultrasonic nebulizer. The precursor is a local Indonesian product, dimethyl tin dichloride (DMTC), with doping ammonium fluoride (NH4F). The variable that used in this study were variations in deposition time (5. 10. 15. 20, and 25 minutes) with a fixed substrate temperature at 300°C and doping variations (un-doped, 2 wt.% doped and 8 wt.% doped) to see the effect of adding F doping to the precursor solution. The resistivity value with deposition time of 5. 10. 15. 20 and 25 minute (2 wt.% doped) is 0.218x100; 0.449x10-1; 1,567x10-2; 0.676x10-2 0.377x10-2 Ω.cm. For doping variations (un-doped, 2 wt% doped and 8 wt% doped) the value is 0.883x10-2; 0.377x10-2; 0.506x10-3 Ω.cm. There is a decreasing trend in the resistivity values obtained along with the increase in deposition time and the addition of doping to obtain better conductive properties. The grain size will increase with increasing deposition time and the addition of doping. The optimum resistivity value obtained in this study was 0.377x10-2 Ω.cm, obtained at the deposition time of 25 minutes with 2 wt.% doping.

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