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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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Metallurgical Examination and Life Time Assesment of High Pressure Steam Pipes of a Palm Oil Processing Plant [Penelitian Metalurgi dan Analisa Umur Layan Pipa Uap Bertekanan Tinggi pada Sebuah Pabrik Pengolahan Minyak Kelapa Sawit] D.N. Adnyana
Metalurgi Vol 33, No 3 (2018): Metalurgi Vol. 33 No. 3 Desember 2018
Publisher : National Research and Innovation Agency (BRIN)

Steel pipes are commonly used for transporting high pressure steam from a steam generating unit or boiler to a steam turbine or other processing unit. This paper presents a metallurgical examination performed on HP steam pipes of a newly constructed plant for transporting high pressure steam from a boiler to a palm oil processing plant. The aim was to assure that the material integrity of the steam pipes meet the intended specification and reliability. In addition, the aim was also to determine the estimated service life of the steam pipes. The metallurgical examination was conducted by preparing a number of specimens from the as-received three pieces of HP steam pipes. Various laboratory examinations were performed including chemical analysis, metallographic examination, hardness testing and tensile testing at 300 °C. In addition, a life-time analysis was also made using an equation based on the ASME Boiler and Pressure Vessel Code (BPVC) and data obtained from the API Standard 530. Results of the metallurgical examination obtained showed that the HP steam pipes which were made of ASTM A-106 Gr. B were all in good condition, either in microstructure or mechanical property. There were no any significant defect observed, and all the three HP steam pipes were assumed being ready to place in service. Under the intended operating pressure and temperature of 70 bar(g) and 300 °C (max), respectively it can be estimated that the HP steam pipes may likely reach some design life up to 25 years or more with the corrosion rate approximately 0.2 - 0.3 mm/year. AbstrakPipa baja sering digunakan untuk menyalurkan uap bertekanan tinggi dari sebuah ketel uap menuju ke unit turbin uap atau ke unit produksi lainnya. Tulisan ini menyajikan penelitian metalurgi yang dilakukan pada sejumlah pipa uap bertekanan tinggi pada sebuah pabrik yang baru dibangun untuk menyalurkan uap bertekanan tinggi dari sebuah ketel uap menuju ke pabrik pengolahan minyak ke-lapa sawit. Tujuannya adalah untuk memastikan bahwa keterpaduan material pipa uap memiliki kesesuaian dengan spesifikasi dan kehandalan yang diinginkan. Disamping itu, tujuannya juga ada-lah untuk memperkirakan umur layan pipa uap tersebut. Pengujian metalurgi dilakukan dengan mempersiapkan sejumlah benda uji yang diambil dari tiga potongan pipa uap yang diterima, yaitu meliputi : analisa kimia, uji metalografi dan uji kekerasan serta uji tarik pada suhu 300 °C. Disamping itu, analisa umur juga dibuat menggunakan persamaan yang diambil dari ASME Boiler dan BPVC (pressure vessel code) dan dari data standar API 530. Hasil pengujian metalurgi yang diperoleh menun-jukkan bahwa pipa uap bertekanan tinggi yang dibuat dari material ASTM A-106 Gr. B seluruhnya dalam kondisi baik, baik dari segi struktur mikro maupun dari segi sifat mekanis. Hasil pengujian juga menunjukkan bahwa pada struktur mikro tidak diketemukan adanya cacat yang berarti, dan seluruh (ke tiga) pipa uap yang di uji tersebut diperkirakan dalam keadaan siap untuk dioperasikan. Pada tekanan operasi 70 bar(g) dan temperatur operasi maksimum 300 °C yang direncanakan, diperkirakan bahwa pipa uap tersebut dapat memberikan umur desain hingga 25 tahun atau lebih dengan laju korosi 0,2 - 0,3mm/tahun.

SIFAT LISTRIK SUPERKONDUKTOR YBa2Cu3O7-x HASIL PROSES PELELEHAN DENGAN DOPANT Ti[Electrical Characterictic of YBa2Cu3O7-x Superconductor Doped by Ti Using Melting Process] Didin S Winataputra; Yustinus MP; Wisnu AA; Deswita Deswita; E Sukirman
Metalurgi Vol 27, No 1 (2012): Metalurgi Vol. 27 No. 1 April 2012
Publisher : National Research and Innovation Agency (BRIN)

KINETIKA REAKSI PELARUTAN NIKEL DARI KALSIN NIKEL LATERIT [Kinetics of Nickel Dissolution from Nickel Laterite Calcine] Rudi Subagja
Metalurgi Vol 30, No 2 (2015): Metalurgi Vol.30 No.2 Agustus 2015
Publisher : National Research and Innovation Agency (BRIN)

Pada penelitian ini telah dilakukan percobaan untuk mempelajari kinetika reaksi pelarutan nikel dari kalsin nikel laterit ke dalam larutan asam sulfat. Kalsin yang digunakan, dipersiapkan melalui cara pemanggangan reduksi bijih nikel laterit pada temperatur 800 °C dengan reduktor 10% batubara. Percobaan pelarutan nikel dari kalsin nikel laterit dilakukan dalam reaktor gelas kapasitas 1 liter, dengan kondisi percobaan : a) konsentrasi asam sulfat yang digunakan sebagai pelarut adalah 0,1 mol/liter, b) laju aerasi udara divariasikan dari 0 liter/menit sampai 1 liter/menit, c) temperatur pelarutan divariasikan dari 40 °C sampai dengan 70 °C, dan waktu pelarutan divariasikan dari 15 menit sampai dengan 240 menit. Dari hasil percobaan diketahui bahwa proses pelarutan nikel dari kalsin nikel laterit ke dalam larutan asam sulfat makin meningkat jika laju aerasi dinaikkan dari 0 liter/menit menjadi 1 liter/menit, temperatur pelarutan dinaikkan dari 40 °C menjadi 70 °C dan waktu reaksi diperpanjang dari 15 menit sampai 180 menit. Dari hasil studi kinetika diketahui bahwa proses pelarutan nikel dari kalsin nikel laterit ke dalam larutan asam sulfat dikendalikan oleh proses difusi dengan nilai energi aktivasi 26,73 Kj/mol. AbstractAt present work, an experiment to investigate a kinetics of nickel dissolution from nickel laterit calcine intothe aqueous sulphuric acid solutions were carried out by using the nickel laterites calcine which wasprepared by reduction roasting of nickel laterites oresby using 10% coal as reducing agents at temperature800 °C. The dissolution test were caried out by using 1 litre capacities of glass reactor, with the experimentalconditions: a) a sulphuric acid concentration 0,1 mole/litre, b) aeration rate were varied from 0 litre/menit upto 1 litre/menit, c)dissolution temperatures were varied from 40 °C up to 70 °C and reaction time were from15 minutes up to 240 minutes. From the result of experiment, it is found that the dissolution of nickel fromnickel laterite calcine into the aqueous sulphuric acid solutions increased when the aeration rate wereincreased from 0 litre/minute to 1 litre/minute, the dissolution temperatures were increased from 40 °C to 70°C. From the kinetics study, it is found that the dissolution of nickel from nickel laterites calcines in to theaqueous sulphuric acid solutions follows the diffusion processcontrolled with activated energy 26.73Kj/mole.

THE EFFECT OF PRECIPITATION ON MICROSTRUCTURE AND CORROSION BEHAVIOUR OF ZK60 SUBJECTED TO SEVERE PLASTIC DEFORMATION AS BIODEGRADABLE MATERIAL Muhammad Rifai
Metalurgi Vol 36, No 3 (2021): Metalurgi Vol. 36 No. 3 Desember 2021
Publisher : National Research and Innovation Agency (BRIN)

Microstructure and corrosion behaviour of ZK60 subjected to severe plastic deformation (SPD) as biodegradable material has been investigated in terms of grain refinement process and precipitation formation. Equal channel angular pressing (ECAP) was one of the well-known SPD techniques due to their advantages to promote dislocation and grain fragmentation. ZK60 billet was cut to a 10 mm diameter cylindrical shape for biodegradable material application. ECAP process was carried out up to two passes by Route Bc at 423 K temperature process. Microhardness test was performed at ECAP processed sample, and the structure observation was carried by optical microscope and transmission electron microscope. The corrosion behaviour of the material was investigated by an anodic polarization curve. The ECAP process promotes dislocation accumulation efficiently and ultrafine-grained structure formation. It may improve the formability characteristic of ZK60. The hardness also showed significant increment during the ECAP process due to the high level of deformation. Corrosion behaviours and microstructure observation during the ECAP process showed a correlation that concluded that grain refinement and precipitation formation influenced the electrochemical properties. The alloying element such as Zn and Zr promoted the protective film for corrosion due to their ability for pitting protection. ECAP improved the precipitation formation for corrosion resistance, microstructure uniformity and material formability.

STUDI PERILAKU PELINDIAN TIMBAL DARI BIJIH GALENA NANGGUNG KABUPATEN BOGOR DALAM LARUTAN ASAM ASETAT DAN OKSIDATOR HIDROGEN PEROKSIDA Zaki Mubarok; Yahya Yahya
Metalurgi Vol 29, No 1 (2014): Metalurgi Vol.29 No.1 April 2014
Publisher : National Research and Innovation Agency (BRIN)

KARAKTERISTIK FISIK DAN KONDUKTIVITAS SPESIFIK BATAS BUTIR DARI ELEKTROLIT PADAT GADOLINIUM CERIA UNTUK APLIKASI INTERMEDIATE TEMPERATURE SOLID OXIDE FUEL CELL Agung Nugroho; Syoni Soepriyanto
Metalurgi Vol 35, No 1 (2020): Metalurgi Vol. 35 No. 1 April 2020
Publisher : National Research and Innovation Agency (BRIN)

Pada penelitian ini, serbuk elektrolit padat dengan komposisi Ce0,8Gd0,15Sm0,05NdxO1,9 dibuat dengan variasi x = 0; 0,025; 0,05; dan 0,075. Serangkaian percobaan dilakukan untuk menghasilkan elektrolit padat dengan ukuran butir mencapai skala nanometer (nm). Percobaan-percobaan ini diawali dengan preparasi serbuk elektrolit menggunakan metode sol-gel dengan prekursor berupa Rare Earth Nitrates. Sampel pengujian dibuat dalam bentuk pelet dengan dimensi 1 cm dengan cara dikompaksi dengan gaya 40 kN untuk menghasilkan green pellet. Selanjutnya, proses sintering dilakukan terhadap green pellet dengan variasi suhu yaitu 1200, 1300, dan 1400oC dengan waktu penahanan selama 5 jam. Perubahan dimensi dari pellet sebelum dan sesudah sintering diukur untuk menentukan nilai densitas relatif dari setiap sampel. Pengujian EIS dengan menggunakan impedance analyzer dilakukan pada rentang temperatur 350-600oC pada selang pengukuran 50oC dan frekuensi 2 MHz-20 Hz. Data-data impedansi kemudian dimodelkan dan dilakukan simulasi fitting dengan bantuan paket program Zview. Beberapa pelet elektrolit hasil sintering pun dianalisis dengan menggunakan X-ray Diffractometer (XRD) dan Scanning Electron Microscope (SEM) untuk mendapatkan karakteristik fisik dari elektrolit padat hasil sintering. Hasil penelitian menunjukkan bahwa metode sol-gel telah berhasil membuat elektrolit padat dengan ukuran butir rata-rata sebesar ±500 nm. Struktur kristal yang dihasilkan dari pellet hasil proses sintering berupa cubic fluorite. Terakhir, dalam paper ini juga dibahas mengenai hubungan strukur mikro hasil sintesis dengan konduktivitas ionik batas butir dari 2 struktur mikro yang berbeda.

Pembuatan Magnesium Karbonat Berukuran Ultra Halus Bagian 1. Perilaku Kalsinasi Dolomit Indonesia[SYNTHESIS OF ULTRA FINE GRAIN MAGNESIUM CARBONATE PART 1. CALCINATION BEHAVIOUR OF INDONESIAN DOLOMITE] Solihin Solihin; Tri Arini; Eni Febriana
Metalurgi Vol 27, No 3 (2012): Metalurgi Vol.27 No.3 Desember 2012
Publisher : National Research and Innovation Agency (BRIN)

OPTIMIZATION OF LATERITE ORE GRINDING PROCESS USING BALL MILL WITH RESPONSE SURFACE METHOD Prameswara, Gyan; Tyassena, Flaviana Yohanala Prista; Amin, Idi; Hatimah, Husnul
Metalurgi Vol 37, No 3 (2022): Metalurgi Vol. 37 No. 3 Desember 2022
Publisher : National Research and Innovation Agency (BRIN)

Dependence and interaction between several operating conditions that affect the grinding process using a ball mill such as the number of balls, grinding duration, and rotational speed on particle size at 80% product mass (P80) and mineral liberation have been obtained in this study using a CCD (central composite design) of response surface method (RSM). The grinding process was carried out in a cylindrical ball mill with a diameter and length of 18.6 cm and 21.5 cm, respectively, as well as a steel ball with a diameter of 2.5 cm and a weight of 100 grams/ball. The optimum data for the grinding process was obtained with the smallest response value of P80. It was known that the number of balls and grinding duration have a significant effect on the reduction of the P80 value in the sample. The model that can describe the influence of process variables on the P80 value was obtained with good accuracy. The character of the mineral content of the sample was observed with the X-Ray Diffraction (XRD) pattern and the elemental concentration. Minerals that have a smaller hardness scale are easier to liberate and more exposed. The P80 value of the initial material was 1560.89 µm, while at the optimum condition the P80 grinding process was reduced to 513.29 µm.

PRELIMINARY STUDY OF ELASTICITY ON BINARY ALLOY Andika Widya Pramono; Anton Suryantoro
Metalurgi Vol 26, No 3 (2011): Metalurgi Vol. 26 No. 3 Desember 2011
Publisher : National Research and Innovation Agency (BRIN)

Apabila setiap komponen dari suatu campuran logam memiliki modulus elastisitas atau struktur kisi (lattice structures) yang berbeda, efek elastis akan berpengaruh pada laju coarsening serta morfologi fasa yang terbentuk. Dalam hal ini efek mekanis yang ditimbulkan oleh fenomena elastisitas ini lebih dominan dibandingkan dengan laju difusi dari proses coarsening. Efek elastis mekanis ini kemudian dapat berpengaruh kepada sifat mekanis dari campuran logam tersebut. Makalah ini menyajikan gambaran awal bagaimana efek elastisitas tersebut dapat dikaji dengan menggunakan pendekatan elemen hingga (finite element) melalui penggunaan persamaan Cahn-Hilliard yang dilanjutkan dengan Persamaan Parabola Orde Keempat. Model Cahn Hilliard dengan efek elastisitas dikembangkan berdasarkan persamaan energi bebas Ginzburg–Landau yang merupakan fungsi dari perbedaan konsentrasi. AbstractIf the components of the mixture have different elastic moduli or different lattice structures, elastic effects might influence the rate of coarsening and the morphology of the particles. In this case the aspect of quasi-static equilibrium for the mechanical part is more predominant than the diffusion mechanism. The resulting elastic effects have a pronounced impact on the evolving coarsening morphology and hence on the material properties. This paper tries to give preliminary consideration on how this elastic behavior is analyzed through finite element approximation using Cahn Hiliard Approach followed by Fourth Order Nonlinear Degenerate Parabolic Equation. Cahn–Hilliard model with elastic contributions is based on a Ginzburg–Landau free energy which is a functional in terms of the concentration difference.

PENGARUH TEMPERATUR DAN WAKTU KALSINASI TERHADAP PERUBAHAN FASA TiO2[Effect Of Temperature And Calcination Time Of Changes In TiO2 Phase] Rudi Subagja; Ahmad Royani; Ariyo Suharyanto; Lia Andriyah; Nadia Chrisayu Natasha
Metalurgi Vol 29, No 3 (2014): Metalurgi Vol.29 NO.3 Desember 2014
Publisher : National Research and Innovation Agency (BRIN)

Page 20 of 29 | Total Record : 287

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