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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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EFFECT NICKEL AND QUENCH-TEMPER PROCESS ON MECHANICAL AND CORROSION PROPERTIES OF ASTM A588 WAETHERING STEEL Rohmah, Miftakhur -; Ramadhan, Gilang; Irawan, Dedi; Utama, Dedi Pria; Romijarso, Toni Bambang
Metalurgi Vol 37, No 3 (2022): Metalurgi Vol. 37 No. 3 Desember 2022
Publisher : National Research and Innovation Agency (BRIN)

The mechanical improvement and "self-protection" properties are mainly needed to develop weather-resistant steel materials. In this study, A588 steel was given thermomechanical treatment (hot-rolling) followed by a quench-tempering process. The A588 is modified by adding 1, 2, and 3 wt% nickel to the primary alloy. Steel is made using a hot rolling process at 750 ℃ for 1 hour with 70% thickness reduction. The sample is heat-treated at 850 ℃ for 1 hour and quenched in water, oil, and open air. The tempering process is conducted at 400 ℃ for 30 minutes. Metallography test is confirmed final microstructural and compared with CCT simulation result. The fast cooling (water and oil quenchant) produces tempered martensite, ferrite, and pearlite, while the air-cooled forms a ferrite-pearlite. The cooling rate significantly affects strength and hardness and the nickel addition on hardness, and both factors have no significant on ductility. The sample owns the highest tensile strength value (~1226 MPa) with 1 %Ni, and the highest ductility value (around 17.1–27.43%) is obtained by air cooling. With 3% Ni, the corrosion rate decreases to 0072 mpy with -432.5 mV for corrosion potential and 0.12µA/cm-2 for current density.

FABRIKASI NANOROD SENG OKSIDA (ZnO) MENGGUNAKAN METODE SOL-GEL DENGAN VARIASI KONSENTRASI POLYETHYLENE GLYCOL DAN WAKTU TUNDA EVAPORASI AMONIA Akhmad Herman Yuwono
Metalurgi Vol 26, No 2 (2011): Metalurgi Vol.26 No.2 Agustus 2011
Publisher : National Research and Innovation Agency (BRIN)

Seng oksida (ZnO) adalah salah satu material semikonduktor yang banyak digunakan dalam aplikasi katalitik, elektronik dan optoelektronik. Pada penelitian ini, ZnO nanorods telah berhasil disintesis menggunakan metode sol-gel dengan campuran (Zn(NO3 ) 2 .4H2 O), NH4 OH, dan polyethylene glycol (PEG). Variasi pada konsentrasi PEG dan penahanan laju evaporasi amoniak pada larutan telah dilakukan dan nanorod ZnO yang dihasilkan dikarakterisasi dengan XRD dan SEM untuk menginvestigasi perbedaan diameter, morfologi dan tingkat nanokristalinitas nanorod ZnO. Penambahan PEG dari 1 hingga 3 gram pada larutan meningkatkan ukuran diameter rata-rata nanorods dari 157 menjadi 464 nm. Namun demikian tidak didapatkan adanya peningkatan ukuran nanokristalit ZnO di dalam struktur solid nanorod tersebut. Pada variasi waktu tunda evaporasi amonia selama 1 dan 2 jam, terjadi penurunan diameter nanorod menjadi 410 dan 328 nm, sebagai perbandingan terhadap diameter nanorod ZnO tanpa proses penundaan evaporasi ammonia yang mencapai 464 nm. Sebaliknya, besar kristalit di dalam struktur nanorod ZnO bertambah dari 121,49 menjadi 166,59 nm sejalan dengan penambahan waktu tunda evaporasi ammonia dari 1 hingga 2 jam, sebagai perbandingan terhadap ukuran kristalit nanorod ZnO tanpa proses penundaan evaporasi ammonia yang hanya mencapai 94,77 nm. AbstractZinc oxide (ZnO) is one of semiconductor materials which has been widely used for catalytic, electronic and optoelectronic applications. In the present research, ZnO nanorod has been successfully synthesized through a sol-gel method using (Zn(NO3)2.4H2O), NH4Keywords: ZnO nanorods, PEG concentration, Evaporation delay time, Crystallinity OH, and polyethylene glycol (PEG) precusrors. Variation in PEG concentration and ammonia evaporation delay time were performed and the resulting ZnO nanorods were characterized by XRD and SEM to investigate the difference in diameter, morphology and nanocrystallinity. It was revellead that the addition of PEG concentration from 1 to 3 grams has increased the average diameter of ZnO nanorods from 157 to 464 nm. However, there was no an increase in the crystallite size on those nanorod solid structures. The ammonia evaporation delay time from 1 to 2 hours has resulted in a deacrease in the average diameter of ZnO nanorods from 410 to 328 nm, in comparison to those of without evaporation delay time which can reach up to 464 nm. By contrast, the average crystallite size of ZnO phase in the nanorod structures has increased from 121.49 to 166.59 nm when the evaporation delay time was prolonged from 1 to 2 hours, as compared to those of without evaporation delay time which can only reach 94.77 nm in size.

STUDI EQUAL CHANNEL ANGULAR PRESSING (ECAP) SUHU NITROGEN CAIR PADA PADUAN Al-Mg-Si (Al 6061) [A Study On Equal Channel Angular Pressing At Liquid Nitrogen Temperature Of Al – Mg – Si (Al 6061) Alloys] Efendi Mabruri; I Nyoman Gede; Edy Priyanto Utomo
Metalurgi Vol 29, No 3 (2014): Metalurgi Vol.29 NO.3 Desember 2014
Publisher : National Research and Innovation Agency (BRIN)

STUDY OF INTERGRANULAR CORROSION ON NON-HEAT TREATABLE ALUMINUM ALLOYS IN A COMPRESSOR AFTER-COOLER D.N. Adnyana
Metalurgi Vol 36, No 1 (2021): Metalurgi Vol. 36 No. 1 April 2021
Publisher : National Research and Innovation Agency (BRIN)

This study was carried out on a compressor heat exchanger (after-cooler) which had a leak in the welded joint of its components made of non-heat treatable aluminum alloys. The purpose of this study is to determine the type and cause, and mechanisms of failure associated with the metallurgical structure that occurs. In this study a number of tests have been carried out including visual and macroscopic examinations, metallographic and hardness testing, and SEM (scanning electron microscopy) analysis equipped with EDS (energy dispersive spectroscopy). The results of the study obtained indicate that the failure mechanism that causes leakage in the aluminum alloy welding joints of the compressor heat exchanger component is intergranular corrosion due to sensitization and the related effect of environmental factors that occur. In addition, the failure may also be affected by welding defect in the form of pinholes.

PEMBUATAN KOMPOSIT POLIKAPROLAKTON-KITOSAN-HIDROKSIAPATIT IRADIASI UNTUK APLIKASI BIOMATERIAL[Preparation of Irradiated Polycaprolactone-Chitosan-Hydroxyapatite for Biomaterial Application] Yessy Warastuti; Basril Abbas; Nani Suryani
Metalurgi Vol 28, No 2 (2013): Metalurgi Vol.28 No.2 Agustus 2013
Publisher : National Research and Innovation Agency (BRIN)

Lapisan Plasma Spray Ni-Al dan Al-Si Pada Tabung Baja Tahan Karat Austenitik Dengan Jarak Semprot Terbatas (Atmospheric Plasma Spray Coating of Ni-Al and Al-Si on Austenitic Stainless-Steel Tube with Limited Short Spray Distance) Ahmad Sahid
Metalurgi Vol 36, No 2 (2021): Metalurgi Vol. 36 No. 2 Agustus 2021
Publisher : National Research and Innovation Agency (BRIN)

Atmospheric Plasma Spray (APS) coating is a widely used thermal spray coating process in industrial applications. High density and high bond strength coating are the main features of this process that is required in almost coating properties for specific applications. The geometrical condition of the workpiece substrate dictates the parameter needed to achieve a certain quality of the coating. Changes in the geometry require modification on the parameter of the process to maintain the quality of the coating. Aluminum Silicon and Nickel Aluminum coating were applied on Stainless Steel substrate casing. Due to the limitation of spray distance between nozzle gun and substrate surface of the casing, modified several parameters of the process were taken. Several parameters were investigated to find out the optimum result of coating and verified with tensile bond strength test, hardness test, and microscopic analysis examination. These activities that involved modification of parameters, mechanical testing, and visual inspection informed that power as a function of voltage and ampere, powder feed rate, the surface speed of substrate (the particular amount of workpiece rotation per minute), and traverse speed of gun, contribute to the result of the optimum coating.

ANALISIS SIFAT LISTRIK NANOKOMPOSIT Fe0,5-C0,5 [Analysis Of Electrical Properties Of Fe0.5-C0.5 Nanocomposite] Yunafsi Yunafsi
Metalurgi Vol 30, No 1 (2015): Metalurgi Vol.30 No.1 APRIL 2015
Publisher : National Research and Innovation Agency (BRIN)

Telah dilakukan analisis sifat listrik nanokomposit Fe0,5-C0,5. Penelitian ini dilakukan untuk mendapat bahan nanokomposit berbasis karbon yang memiliki sifat listrik lebih tinggi, dalam rangka pengaplikasiannya di bidang elektronik. Nanokomposit Fe0,5-C0,5 dibuat dari campuran serbuk Fe dan serbuk grafit dengan perbandingan berat 1 : 1, kemudian dilakukan proses milling selama 50 jam. Hasil identifikasi pola difraksi sinar-X (X-Ray Diffraction, XRD) menunjukkan bahwa proses milling selama 50 jam terdapat puncak intensitas difraksi yang didominasi oleh fasa C(002) dan Fe(101), dan analisis data XRD menunjukkan ukuran butiran serbuk C sekitar 8 nm dan Fe sekitar 16 nm. Morfologi permukaan yang diukur dengan SEM menunjukkan bahwa ukuran serbuk Fe-C sebelum proses milling>10 µm, dan setelah proses milling selama 50 jam menunjukkan ukuran sekitar 50 nm.Hasil analisis ukuran partikel dan luas permukaan nanokomposit Fe0,5-C0,5 masing-masing adalah 50 nm dan 705 m2/g. Dengan demikian, proses milling selama 50 jam terhadap campuran komposit Fe0,5-C0,5 dapat menghasilkan nanokomposit Fe0,5-C0,5. Sifat listrik nanokomposit Fe0,5-C0,5 yang diukur dengan alat LCR (Inductance : L, Capacitance : C, and Resistance : R) meter menunjukkan nilai konduktivitas 2,56 S/cm dan kapasitansi 0,15 µF pada frekuensi 100 kHz. Nanokomposit Fe-C menunjukkan sifat listrik lebih tinggi bila dibanding dengan komposit Fe-C berukuran mikro. AbstractAnalysis of electrical properties of Fe0.5-C0.5 nanocomposite has been carried out. This study was conductedto obtain carbon-based composite material that has higher electrical properties in the framework of itsapplication in electronics field. Fe0.5-C0.5 nanocomposite was prepared from a mixture of Fe powder andgraphite powder with weight ratio of 1: 1. Then it milled for 50 hours. Identification of X-ray diffraction(XRD) pattern showed that during such 50-hours milling process, the intensity of the diffraction peaks wasdominated by phase C (002) and Fe (101). The results of XRD data analysis showed the grain size of powderof about 25 nm and 36 nm for C and Fe, respectively. Surface morphology measured by SEM showed thatthe size of the Fe-C powder before milling process >10 μm, and after milled for 50 hours showed a size ofabout 50 nm.The analysis results of particle size and surface area of Fe0.5-C0.5 nanocomposite obtained, i.e.50 nm and 705m2/g, respectively.Thus, the process of milling for 50 hours against a mixture of Fe0.5-C0.5composite can produce Fe0.5-C0.5 nanocomposite. Electrical properties of nanocomposite Fe0.5-C0.5 measuredby a LCR (Inductance : L, Capacitance : C, and Resistance : R) meter showed the value of conductivity of2.56 S / cm and capacitance of 0.15 μF at frequency of 100 kHz. Fe0.5-C0.5 nanocomposite shows the higherthe electric properties when compared with the Fe-C micro-sized composite.

PERILAKU PELARUTAN LOGAM NIKEL DAN BESI DARI BIJIH NIKEL KADAR RENDAH SULAWESI TENGGARA Solihin Solihin; F firdiyono
Metalurgi Vol 29, No 2 (2014): Metalurgi Vol.29 No.2 Agustus 2014
Publisher : National Research and Innovation Agency (BRIN)

cover, daftar isi, abstrak vol 35 Desember 2020 Lia Andriyah
Metalurgi Vol 35, No 3 (2020): Metalurgi Vol. 35 No. 3 Desember2020
Publisher : National Research and Innovation Agency (BRIN)

KONSEP DAN APLIKASI SIMULATOR TANUR PUTAR[The Concept and Application of Rotary Kiln Simulator] Rahardjo Binudi
Metalurgi Vol 28, No 1 (2013): Metalurgi Vol.28 No.1 April 2013
Publisher : National Research and Innovation Agency (BRIN)

Page 24 of 29 | Total Record : 287

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