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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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PENGARUH PENEMPAAN DAN PERLAKUAN PANAS TERHADAP SIFAT MEKANIK DAN KETAHANAN KOROSI PADA MODIFIKASI BAJA LATERIT A-588 Miftakhur - Rohmah
Metalurgi Vol 36, No 1 (2021): Metalurgi Vol. 36 No. 1 April 2021
Publisher : National Research and Innovation Agency (BRIN)

High strength low alloy (HSLA) yang diaplikasikan menjadi baja tahan cuaca merupakan terobosan terbaru untuk menghasilkan sifat mekanik dan ketahanan korosi yang tinggi. Modifikasi Baja Laterit dengan penambahan kadar nikel yang diterapkan proses termomekanikal (TMCP) berupa kombinasi proses penempaan panas dan perlakuan panas menjadi fokusan penelitian ini. Sampel yang digunakan merupakan Baja Laterit A-588 hasil investment casting yang telah ditambahkan kadar nikel sebesar 1, 2, dan 3% kemudian diproses penempaan panas dengan pembebanan 100 ton pada temperatur 1050 ℃. Nikel berfungsi sebagai penstabil austenit. Variabel perlakuan panas yang digunakan yakni (1) langsung pendinginan udara, (2) dilanjutkan proses pemanasan pada temperatur 750 ℃ yang diikuti pendinginan cepat. Karakterisasi material menggunakan uji metalografi, uji keras, uji tarik, dan uji polarisasi. Pada sampel tempa panas+pendinginan udara, pertambahan kadar nikel hingga 3% mempengaruhi nilai fraksi fasa ferrit-perlit yang terbentuk, pertambahan ukuran butir hingga ±0,1 mm, penurunan kekerasan hingga 185,22 BHN, penurunan kekuatan hingga 554 MPa, dan pertambahkan elongasi sebesar 29.1%. Sedangkan pada sampel tempa panas+perlakuan panas dengan pendinginan air, pertambahan nikel hingga 3% menyebabkan terbentuknya fasa dislokasi lath martensit+ferrit+retained austenite, penurunan kekerasan hingga 236,18 BHN, penurunan kekuatan hingga 852 MPa, penurunan elongasi hingga 24,7%. Fasa retained austenite memiliki efek merusak pada sifat mekanis.

KARAKTERISTIK STRUKTUR MIKRO DAN SIFAT MEKANIK BESI TUANG PUTIH PADUAN KROM TINGGI HASIL THERMAL HARDENING UNTUK APLIKASI GRINDING BALL[Microstructure Characteristic and Mechanical Properties of Thermal Hardened of High Chromium White Cast Iron for Grinding Ball Application] Achmad Sofi; Widi Astuti; Fajar Nurjaman
Metalurgi Vol 28, No 3 (2013): Metalurgi Vol.28 No.3 Desember 2013
Publisher : National Research and Innovation Agency (BRIN)

PENGENDAPAN TEMBAGA DARI LARUTAN TEMBAGA SULFAT DENGAN CARA SEMENTASI MENGGUNAKAN BESI Rudi Subagja
Metalurgi Vol 29, No 2 (2014): Metalurgi Vol.29 No.2 Agustus 2014
Publisher : National Research and Innovation Agency (BRIN)

PENGARUH PERLAKUAN HIDROTERMAL TERHADAP MORFOLOGI, SIFAT OPTIK DAN SIFAT LISTRIK LAPISAN TIPIS NANORODS ZNO Lalu Suhaimi
Metalurgi Vol 35, No 3 (2020): Metalurgi Vol. 35 No. 3 Desember2020
Publisher : National Research and Innovation Agency (BRIN)

Zinc oxide nanorods (ZnO NRs) is a semiconductor material that has been widely applied in various fields. In this research, ZnO NRs were successfully grown on ITO substrates by chemichal bath deposition (CBD) method. The process begins with making a seed solution using an ecimolar mixture of Zn-Nitrate and hexamethylentetramine (HMTA) at 00C for one hour with 0.015 M concentration. Furthermore, making a layer of seeds using spin coating technique. ZnO NRs were grown using the CBD method at 900C for three hours then treated with variations which are hydrothermal method treatment and non-hydrothermal method treatment at 1500C for three hours. Samples were given characterization treatment using SEM, XRD, UV-Vis and four-point probe. SEM results showed that hydrothermal treatment was able to increase the coverage of nanorods on the substrate to be more prevelently and was able to increase the vertical structure of the nanorods. The results of XRD analysis showed that samples given hydrothermal treatment experienced an increase in the crystallite size. The amount of crystallite size in the sample treated with variation of non-hydrothermal treatment and hydrothermal treatment was 71, 198 and 165.696 nm. Hydrothermal treatment of nanorods samples decreased the sample diameter from 288,252 nm to 125,824 nm. The transmittance value of the samples decreased in the presence of hydrothermal treatment which is 56.53% to 38.67%. The hydrothermal treatment was able to reduce the energy bandgap (Eg) of the sample, while the sample of non-hydrothermal treatment showed value of the Eg was 3.22 eV. Meanwhile, the value of Eg after hydrothermal treatment was 3.17 eV. The resistivity value of ZnO NRs with hydrothermal treatment was 0.833 x 10-4 Ωcm, while the resistivity value of non-hydrothermal treatment was 1.126 x 10-4 Ωcm. Key words: zinc-oxide nanorods, chemical bath deposition, hydro-thermal

SIFAT LISTRIK DAN MAGNETIK LAPISAN TIPIS NANOKOMPOSIT Fe-C/Si(100)[Electrical and Magnetic Properties of Fe-C/Si(100) Nanocomposite Thin Film.] Yunasfi Yunasfi; Mashadi Mashadi; Saeful Yusuf
Metalurgi Vol 28, No 2 (2013): Metalurgi Vol.28 No.2 Agustus 2013
Publisher : National Research and Innovation Agency (BRIN)

Performa Korosi Baja Karbon Pada Uji Simulasi Pipa Untuk Sistem Saluran Air Pendingin [Corrosion Performance of Carbon Steel in Pipe Simulation Test for Cooling Water Systems] Ahmad Royani
Metalurgi Vol 34, No 2 (2019): Metalurgi Vol. 34 No. 2 Agustus 2019
Publisher : National Research and Innovation Agency (BRIN)

The main problem in cooling water systems in geothermal power plant units is supported by corrosion, deposits, and slime. Corrosion can shorten the life of cooling water system equipment due to a decrease in operating efficiency, leakage, and pollution. These problems, occur very complex and many causes. On the other hand, most cooling water systems in the industry contain carbon steel components that are easily corroded. To determine the value of the corrosion rate of carbon steel in a geothermal power plant, a simulation test using an open recirculating system was carried out. The simulation process is done by an interval test method and based on NACE RP0775 standard. The corrosion rate of those steel was determined by weight loss method. The Morphology of surface and composition of corrosion products are characterized using scanning electron microscopy (SEM), X-ray diffractometer (XRD) and energy dispersive spectroscopy (EDS). The corrosion rate values of carbon steel from the simulation results for 1, 3 and 4 weeks were 2.29 mmpy; 1.23 mmpy; and 0.93 mmpy, respectively. There is a decrease in the corrosion rate of the simulation time is extended, because of passive film layers on the steel surface. Meanwhile, the most dominant water parameters in this simulation are dissolved oxygen (DO). The change of DO greatly affect the corrosion rate of carbon steel. Based on the product morphology of corrosion, corrosion attacks occur locally. Corrosion products form oxide compounds in the form of Fe3O4, FeOOH, and Fe2O3. AbstrakMasalah utama dalam sistem pendingin air dalam unit pembangkit listrik panas bumi meliputi korosi, deposit dan slime (lendir). Korosi dapat memperpendek umur pakai peralatan sistem pendingin air karena mengakibatkan penurunan efisiensi operasi, kebocoran dan polusi. Masalah-masalah tersebut sangat komplek dan banyak faktor penyebabnya. Di sisi lain, sebagian besar sistem air pendingin di industri mengandung komponen baja karbon yang mudah terkorosi. Untuk mengetahui nilai laju korosi baja karbon pada unit pembangkit listrik panas bumi, maka dilakukan uji simulasi menggunakan sistem resirkulasi air terbuka pada temperatur 37 °C. Proses simulasi dilakukan dengan metode interval test dan berdasarkan standar NACE RP0775. Laju korosi baja tersebut diukur dengan metode pengurangan berat. Morfologi permukaan dan komposisi produk korosi dikarakterisasi menggunakan SEM (scanning electron microscopy), XRD (x-ray diffraction) dan EDS (energy dispersive spectroscopy). Nilai laju korosi baja karbon hasil uji simulasi selama 1, 3 dan 4 minggu masing-masing sebesar 2,29 mmpy; 1,23 mmpy; dan 0,93 mmpy. Terjadi penurunan laju korosi jika waktu simulasi diperpanjang akibat terbentuknya lapisan produk korosi pada permukaan baja. Sementara itu, parameter air yang paling menentukan laju korosi adalah DO (dissolved oxygen). Perubahan DO sangat mempengaruhi kecepatan laju korosi. Berdasarkan morfologi produk korosi, serangan korosi terjadi secara lokal yang sebarannya merata. Produk korosi berupa senyawa oksida dalam bentuk Fe3O4, FeOOH dan Fe2O3.

PEMETAAN TINGKAT KOROSIFITAS DI DAERAH DKI JAKARTA[Corrosion Mapping of Corrosivity Level in DKI Jakarta] Ronald Nasoetion
Metalurgi Vol 27, No 2 (2012): Metalurgi Vol. 27 No. 2 Agustus 2012
Publisher : National Research and Innovation Agency (BRIN)

ANODISASI PADUAN AL 2024 T3 DENGAN METODE PULSE CURRENT DALAM LARUTAN ASAM TARTARAT-SULFAT (TSA) [A Preliminary Study of Corrosion for Ni3(Si,Ti) Intermetallic Compound With Various Temperatures in Neutral Sodium Chloride Solution] Mohammad Zaki Mubarok; Soleh Wahyudi; Fitrian Oddang; Sutarno Suharto
Metalurgi Vol 30, No 3 (2015): Metalurgi Vol. 30 No. 3 Desember 2015
Publisher : National Research and Innovation Agency (BRIN)

Sebagai alternatif proses anodisasi konvensional dalam larutan asam sulfat dan asam kromat, telah dikembangkan proses anodisasi dalam larutan asam tartarat-sulfat (TSA) untuk mendapatkan proses yang lebih ramah lingkungan dengan durasi yang lebih singkat dan menghasilkan morfologi lapisan anodize serta ketahanan korosi yang lebih baik pada paduan aluminium. Pada paper ini dipresentasikan hasil-hasil percobaan anodisasi paduan Al 2024 T3 dalam larutan asam tartarat-sulfat dengan metode pulse current dan didiskusikan pengaruh temperatur, tegangan, dan lama waktu anodisasi terhadap berat dan ketebalan lapisan anodize serta ketahanan korosi lapisan anodize. Hasil analisis variansi (ANOVA) 3 faktor menunjukkan urutan faktor yang paling berpengaruh terhadap tebal dan berat lapisan anodize setelah sealing secara berurutan adalah temperatur, tegangan sel, dan lama waktu anodisasi. Ketebalan lapisan anodize sebanding dengan rapat arus dan waktu anodisasi yang dipengaruhi oleh temperatur dan tegangan. Berdasarkan hasil response surface dan contour plot pengaruh temperatur dan tegangan terhadap rapat arus, ketebalan dan berat lapisan anodize serta jumlah pit yang terbentuk setelah uji sembur garam selama 336 jam, kondisi proses anodisasi Al 2024 T3 dengan metode pulse current yang disarankan adalah pada selang temperatur 23-30oC dengan tegangan sel 7,3 - 10 V dan waktu proses selama 30 menit. Abstract The intermetallic compound of Ni3(Si,Ti) containing L12 single phase, have been applied as a candidate forhigh temperature material. This prelimenary study have been investigated using immersion test andpolarization test in neutral 0.5 M NaCl solution at ambient temperature,of 40 °C and 60 °C, where themorfology of the corroded spesimens were observed by scanning electron microscope. The susceptibility ofintergranular corrosion for this compound increases with increasing the temperature of solutions. Theincrease of temperature contributes for the diffulty of stable film formation with decreasing passive regions.The corrosion resistance of the compound decreased with increasing temperature test. It is implies thatintergranular attack of the compound took place due to the presence of boron in grain boundaries.

Pengaruh Waktu Deposisi dan Temperatur Substrat Terhadap Pembuatan Kaca Konduktif FTO (Fluorine doped Tin Oxide) [The Influence of Deposition Time and Substrate Temperature in Manufacturing Process of FTO (Fluorine doped Tin Oxide) Conductive Glass] Tri Arini; Latifa Hanum Lalasari; Akhmad Herman Yuwono; F Firdiyono; Lia Andriyah; Achmad Subhan
Metalurgi Vol 32, No 1 (2017): Metalurgi Vol. 32 No. 1 April 2017
Publisher : National Research and Innovation Agency (BRIN)

Manufacturing FTO (fluorine-doped tin oxide) is expected to replace ITO (indium tin oxide) because the process is simple and relatively low cost. Tin chloride precursor with fluorine doping is prepared via sol-gel method with a coating process with spray pyrolisis technique can be considered as a new breakthrough in DSSC device structures. This experiment uses the raw material tin (II) chloride hydrate (SnCl2.2H2O) as precursors and ammonium fluoride (NH4F) as a doping ratio of 6% wt with variation in temperatures of 250, 300, 350, 400 °C and time resistivities of 5, 20, 30 and 40 minutes. The results showed that the longer deposition time decreasing value of conductive glass resistivity. This condition would reduce the value of transmittance. High transmittance and low resistivity obtained on the variation of deposition time 5 minutes with a substrate temperature of 300 °C with a resistivity value of 3.16 x 10-4 Ω.cm and transmittance value of 86.74%AbstrakPembuatan FTO (flourine-doped tin oxide) ini diharapkan dapat menggantikan fungsi ITO (indium tin oxide) karena proses pembuatan yang sederhana dan biaya yang relatif rendah. Prekursor timah klorida dengan doping flourine yang dipreparasi melalui metode sol-gel dengan proses pelapisan dengan teknik spray pyrolisis dapat dipertimbangkan sebagai suatu terobosan baru di dalam struktur device sel surya tersensitasi zat pewarna. Percobaan ini menggunakan bahan baku timah (II) klorida hidrat (SnCl2.2H2O) sebagai prekursor dan amonium florida (NH4F) sebagai doping dengan rasio 6 %berat dengan variasi temperatur 250, 300, 350, 400 °C dan dengan variasi waktu 5, 20, 30, dan 40 menit. Hasil percobaan menunjukkan bahwa semakin lama waktu deposisi maka akan semakin kecil nilai resistivitas kaca konduktif. Namun semakin lama waktu deposisi akan mengurangi nilai transmitansi. Pada percobaan ini menghasilkan transmitansi tinggi dan resistivitas rendah diperoleh pada variasi waktu deposisi 5 menit dengan temperatur substrat 300 °C dengan nilai resitivitas 3,16 x 10-4 Ω.cm dan nilai transmitansi 86,74%.

HARDNESS AND CORROSION BEHAVIOR OF Ti-20Cu-20Ni-20Mn- 20Zn AS HIGH ENTROPY ALLOY AND TI-13Cu-9Ni-5Mn-5Zn FOR MARINE STRUCTURE APPLICATION Muhammad Azhar Ariefkha Dani; Bonita Dilasari; Yudi Nugraha Thaha; Ika Kartika; Fendy Rokhmanto
Metalurgi Vol 37, No 2 (2022): Metalurgi Vol. 37 No. 2 Agustus 2022
Publisher : National Research and Innovation Agency (BRIN)

An aneurysm clip is an implant tool for assisting the neurosurgeon in treating acute hemorrhagic stroke and cerebral aneurysm. This equipment stops the blood flow of a ruptured or enlarged blood vessel or aneurysm. In the development of aneurysm clip production, titanium alloy is the most used material selection. Several researchers reported that this metal leads to artifacts during MR (magnetic resonance) or CT (computed tomography) imaging. Since several pieces of evidence polyurethane could be a good material selection for aneurysm clips, this paper aims to investigate the material properties of the polyurethane foam with an additional combination of magnesium and zinc. This study conducts magnesium and zinc composition variations of 1 wt.%, 2 wt.%, and 3 wt.%, respectively. The materials were tested using a compression test, a FTIR (fourier-transform-infrared), SEM (scanning-electron-microscope), DSC (differential-scanning-calorimetry), and TGA (thermogravimetric-analyzer) to determine the material properties. From all examinations, adding magnesium and zinc to polyurethane foam affected the compressive strength and porosity of the polyurethane foam. Therefore, all test results concluded that adding magnesium with a composition of 3wt.%, which has a compressive strength of 0.84 MPa, is the best mixture. The idea of finding other compositions that are compatible with the polyurethane will significantly increase the possibility of new materials for aneurysm clip construction.

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