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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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STUDI PENAMBAHAN UNSUR Ca PADA PADUAN BINER Mg-Ca TERHADAP PEMBENTUKAN FASA DAN KOROSI IN-VITRO UNTUK APLIKASI IMPLAN MAMPU LURUH [Study of Calcium Addition in Mg-Ca Binary Alloy in Phase Transformation and in- Vitro Corrosion For Biodegradable Implant] Dhyah Annur; Franciska Pramuji Lestari
Metalurgi Vol 30, No 2 (2015): Metalurgi Vol.30 No.2 Agustus 2015
Publisher : National Research and Innovation Agency (BRIN)

Paduan magnesium merupakan paduan yang tengah dikembangkan untuk aplikasi biomedis karena memiliki sifat mampu luruh dan juga biokompatibel. Pada penelitian kali ini dikembangan paduan logam binner Mg-Ca dengan komposisi 1%berat, 4%berat, dan 7%berat Ca yang dibuat dengan teknik metalurgi serbuk untuk mengetahui pengaruh penambahan unsur Ca terhadap fasa yang terbentuk dan ketahanan korosi paduan. Evaluasi fasa yang terbentuk dilakukan dengan menggunakan x-ray diffractometry (XRD) dan uji korosi secara elektrokimia yang dievaluasi melalui in-vitro dengan polarisasi potensiodinamik dalam larutan Hank’s pada temperatur ruang. Penambahan paduan Ca menyebabkan terbentuknya formasi fasa Mg2Ca yang secara sistematik meningkatkan laju korosi dan menurunkan potensial korosi paduan Mg-Ca. Hasil uji XRD menunjukkan fasa Mg2Ca terbentuk pada paduan Mg-7Ca. Hasil uji elektrokimia juga mengindikasikan bahwa laju korosi meningkat dan potensial korosi menurun dengan penambahan unsur Ca akibat terbentuknya fasa Mg2Ca yang lebih katodik. Fenomena tersebut di atas mengindikasikan bahwa Mg-1Ca merupakan kandidat serta paduan optimal yang dapat digunakan sebagai bahan baku pembuatan produk implan mampu luruh. AbstractMagnesium alloy is currently being developed for biomedical devices application due to its biodegradableand biocompatible properties. In this study, Mg- Ca (1% wt, 4%wt, and 7%wt Ca) alloys have been beenprepared through powder metallurgy process to study the effect of Ca addition to the phase transformationand the corrosion properties. Phase transformation were characterized through X-Ray Diffractometry (XRD).Meanwhile, the corrosion properties were evaluated in- vitro by means of polarization potentiodinamic inHank’s solution. The electrochemical tests were carried out at room temperature using a corrosionmeasurement system. It was shown that Ca addition affect the formation of Mg2Ca phase whichsystematically could increase the corrosion rate and reduce potential corrosion of Mg- Ca alloy. From XRDevaluation, it can be seen that Mg2Ca phase were formed at Mg-7Ca alloy. The electrochemical testing alsoindicated the increasing of corrosion rate and the reduction of potential corrosion along with Ca additionwere caused by formation of Mg2Ca phase which was more cathodic. This phenomena had shown that Mg-1Ca alloy could be studied further as a raw material for biodegradable implant application.

STRUKTURMIKRO, KEKERASAN, DAN KETAHANAN KOROSI BAJA TAHAN KARAT MARTENSITIK 13Cr3Mo3Ni HASIL QUENCH-TEMPER DENGAN VARIASI TEMPERATUR DAN WAKTU AUSTENISASI Siska Prifiharni; Denni Ahmad; Andini Juniarsih; Efendi Mabruri
Metalurgi Vol 27, No 2 (2012): Metalurgi Vol. 27 No. 2 Agustus 2012
Publisher : National Research and Innovation Agency (BRIN)

EFFECT OF MO DURING THE OXIDATION OF NI20CR-XMO ALLOYS AT 570°C Hubby Izzuddin
Metalurgi Vol 36, No 3 (2021): Metalurgi Vol. 36 No. 3 Desember 2021
Publisher : National Research and Innovation Agency (BRIN)

The effect of Mo addition on the oxidation behavior of the Ni20Cr-xMo alloys at 570°C for 100 h was investigated. The results revealed that oxidation performance of the Ni20Cr alloys was increased by Mo addition. During the oxidation, the Mo-free alloy formed thin NiO scale on the outer scale and thick continous Cr2O3 scale accompanied with inward Cr2O3 penetrations and a Cr-depleted zone. There were also formations of mix Ni-Cr oxides in between NiO and Cr2O3 scale. While, the oxide scales formed on the Mo-containing alloys consisted of a duplex structure with a thick NiO scale on the outer scale and Cr(Mo)-Cr-Mo oxides on the inner scale. A porous oxide structure was also formed in the inner scale. The presence of Mo resulted in the formation of NiO scale and less the inward diffusion into Cr2O3 scale. But, more volatile oxides and porous oxide structures would form with higher Mo addition resulted in lower oxidation resistance for the Ni20Cr alloys.

PENGARUH TEMPERATUR DAN pH AIR SADAH KALSIUM SULFAT TERHADAP KOROSI PADA BAJA KARBON Sundjono Sundjono; Saefudin Saefudin
Metalurgi Vol 29, No 1 (2014): Metalurgi Vol.29 No.1 April 2014
Publisher : National Research and Innovation Agency (BRIN)

LAPISAN FLAME SPRAYED SS430-AL PADA BAJA KARBON: STRUKTUR DAN KETAHANAN OKSIDASI TEMPERATUR TINGGI Muhammad Rizki Hifdzia Fahmi; Sutrisno Sutrisno; Bambang Hermanto; Toto Sudiro
Metalurgi Vol 35, No 1 (2020): Metalurgi Vol. 35 No. 1 April 2020
Publisher : National Research and Innovation Agency (BRIN)

Pada penelitian ini, telah dilakukan proses pelapisan serbuk SS430 murni dan SS430-10Al pada substrat baja karbon rendah dengan teknik flame spray guna meningkatkan ketahanannya terhadap oksidasi pada temperatur tinggi. Untuk menganalisa ketahanan oksidasi dari lapisan tersebut, masing-masing sampel diuji oksidasi pada temperatur 550°Cselama 10 siklus dengan sampel pembanding adalah baja karbon tanpa pelapisan. Struktur lapisan yang terbentuk pada permukaan sampel sebelum dan sesudah uji oksidasi dianalisa dengan menggunakan X-Ray Diffractometer (XRD) danScanning Electron Microscope-Energy Dispersive X-ray Spectroscopy (SEM-EDX). Analisis XRD lapisan hasil flame spray sebelum uji oksidasi menunjukkan bahwa lapisan SS430 murni tersusun atas fasa (Fe-Cr) dan lapisan SS430-10 Al terdiri atas fasa (Fe-Cr) dan Al. Hasil analisis mikrostruktur pada lapisan hasil flame spray menunjukkan bahwa dengan penambahan alumunium, lapisan yang terbentuk lebih tebal dan mengikat dengan tingkat porositas yang lebih sedikit. Namun, evaluasi oksidasi menunjukkan bahwa lapisan SS430 murni memiliki ketahanan terhadap oksidasi yang lebih baik dibandingkan dengan lapisan SS430-10Al dan substrat tanpa coating.

KARAKTERISASI PASIR SILIKA CIBADAK SUKABUMI SEBAGAI BAHAN BAKU PEMBUATAN RAMMING MIX SILICA[Characterization of Cibadak Sukabumi Silica Sand As Raw Material for Ramming Mix Silica Manufacturing] Abdul Rachman; Frank Edwin; Pius Sebleku
Metalurgi Vol 27, No 3 (2012): Metalurgi Vol.27 No.3 Desember 2012
Publisher : National Research and Innovation Agency (BRIN)

Fenomena Temper Embrittlement Pada Baja Martensitik AISI 410 Untuk Aplikasi Stem Gate Valve 20” Class 150 Grade WCB [Temper Embrittlement Phenomena of AISI 410 Martensitic Steel for Stem Gate Valve 20” Class 150 Grade WCB ] Galih Senopati; Cahya Sutowo; Efendi Mabruri
Metalurgi Vol 31, No 1 (2016): Metalurgi Vol. 31 No. 1 April 2016
Publisher : National Research and Innovation Agency (BRIN)

Temper embrittlement is a phenomenon that will decrease the toughness of steel due to tempering process at a certain temperature range. This phenomenon has been found in martensitic steel. This research is investigated the failure in stem gate valve of crude oil pipeline system. The stem gate valve material is made of stainless steel AISI 410. Several examinations were done to study cause of failure in stem gate valve such as visual inspection, chemical composition test using OES (optical emission spectrometer) and EDS (energy dispersive spectrometry), metallography observation by using optical microscopy (OM) and SEM (scanning electron microscopy), fractography using SEM, and Rockwell hardness test. Chemical composition test result on stem gate valve showed 13,65-13,67 wt.% Cr. The content of Cr in stem material is out from the required composition of AISI standard with the requirement of Cr amount 13,5 wt.%. Fractography result on the surface of failure stem area by SEM was observed intergranular crack followed by secondary crack. Its indicated that stem gate valve failure was caused by temper embrittlement due to tempering process.AbstrakTemper embrittlement merupakan fenomena penurunan kekuatan dari material baja yang disebabkan oleh proses tempering pada rentang temperatur tertentu. Beberapa kasus temper embrittlement ditemukan pada baja martensitik. Pada studi kali ini dilakukan pengamatan terhadap stem gate valve pada sistem perpipaan minyak mentah yang mengalami patah. Stem gate valve tersebut terbuat dari baja tahan karat martensitik tipe AISI 410. Kemudian dilakukan beberapa pengujian untuk mengetahui proses terjadinya patah pada stem gate valve yang meliputi pemeriksaan visual, analisa komposisi kimia dengan OES (optical emission spectrometer) dan EDS (energy dispersive spectrometry), pengamatan metalografi dengan OM (optical microscopy) dan SEM (scanning electron microscopy), fraktografi dengan SEM, serta uji keras Rockwell. Hasil pemeriksaan pada stem gate valve menunjukkan komposisi Cr adalah 13,65-13,67 % berat atau melebihi batas atas standar AISI 410 yaitu 13,5 %berat. Dari pengamatan struktur mikro diketahui material stem gate valve dalam kondisi telah dilakukan proses tempering dan teramati adanya secondary crack. Dari pengamatan fraktografi diketahui jenis retakan pada permukaan stem yang patah adalah retakan antar butir (intergranular crack) yang mengindikasikan terjadinya proses temper embrittlement pada saat proses tempering material stem gate valve.

IRON REMOVAL PROCESS FROM NICKEL PREGNANT LEACH SOLUTION USING SODIUM HYDROXIDE Zunaidi, Mochamad Afriansyah; Setiawan, Iwan; Oediyani, Soesaptri; Irawan, Januar; Rhamdani, Ahmad Rizky; Syahid, Adi Noer
Metalurgi Vol 37, No 3 (2022): Metalurgi Vol. 37 No. 3 Desember 2022
Publisher : National Research and Innovation Agency (BRIN)

Indonesia is a country that has abundant mineral resources, including nickel resources in laterite ore. Nickel demand has risen significantly because of the need for nickel precursors for battery production. Nickel laterite can be processed via the hydrometallurgical route to obtain nickel precursor by leaching the laterite ore with an acid solution to produce a nickel-rich solution or Pregnant Leach Solutions (PLS). This nickel-rich solution is then processed by precipitation with a base solution to make its hydroxides known as Mixed Hydroxides Precipitate (MHP). MHP is the main product that contains nickel and cobalt for making the material for a lithium battery. PLS usually contain iron impurity, which also dissolves when the ore is leached. Therefore, the iron needs to be separated to make high-purity MHP. To solve this problem, synthetic PLS contained nickel, cobalt, and iron, and their concentration was simulated to match the general PLS composition. From the experiment, it was observed that iron could be precipitated at two stages at solution pH of 3 and 3.5 using 2.5 M NaOH solution. After that, nickel and cobalt can be precipitated at higher pH. To study the effect of pH and temperature on the yield of nickel and cobalt precipitation, precipitation at pH of 7, 8, and 9; and temperature of 70, 80, and 90 °C was conducted. The results show that the highest yield was obtained at a pH of 9 and temperature of 90 °C, with precipitation yield of nickel and cobalt at 99.03% and 98.78%, respectively.

PENINGKATAN KADAR NIKEL (Ni) DAN BESI (Fe) DARI BIJIH NIKEL LATERIT KADAR RENDAH JENIS SAPROLIT UNTUK BAHAN BAKU NICKEL CONTAINING PIG IRON (NCPI/NPI) Agus Budi Prasetyo; Puguh Prasetyo
Metalurgi Vol 26, No 3 (2011): Metalurgi Vol. 26 No. 3 Desember 2011
Publisher : National Research and Innovation Agency (BRIN)

Telah dilakukan percobaan pemanggangan reduksi terhadap bijih nikel laterit kadar rendah jenis saprolit dari Sangaji Halmahera untuk bahan baku pembuatan Nickel Containing Pig Iron (NCPI/NPI). Percobaan ini dimaksudkan untuk mengetahui sampai sejauh mana terjadi peningkatan kadar Ni dan Fe dari saprolit kadar rendah dengan kadar 1,27 % Ni dan 9,44 % Fe. Pemanggangan reduksi terhadap pellet saprolit dilakukan dalam muffle furnace. Selanjutnya kalsin hasil reduksi dikonsentrasi menggunakan magnetik separator dengan cara basah untuk mendapatkan konsentrat dan tailing. Kemudian konsentrat dan tailing dianalisa dengan AAS untuk mengetahui seberapa besar peningkatan kadar Ni dan Fe. Untuk percobaan digunakan variabel temperatur, waktu dan persen reduktor. Diperoleh hasil percobaan optimal pada T ± 1100 °C, bentonit 2 %, waktu pemanggangan 1 jam. dan 12,5 % batubara. Pada konsentrat terjadi peningkatan kadar Ni menjadi 1,97 % dan kadar Fe menjadi19,10 %. Sedangkan pada tailing terjadi penurunan kadar Ni menjadi 1,02 % dan kadar Fe naik menjadi 11,20%. Apabila konsentrat dilebur menjadi NCPI/NPI sesuai untuk menjadi SS 300 (stainless steel 300) sedangkan tailing apabila dilebur menjadi NCPI/NPI sesuai untuk menjadi SS 200. AbstractReduction experiments have been conducted on the ore roasting of low grade nickel laterite saprolite type of Halmahera Sangaji feedstock for the manufacture of Pig Iron Containing Nickel (NCPI / NPI). These experiments are intended to determine the extent of an increase in levels of Ni and Fe from low grade saprolite grading 1.27% Ni and 9.44% Fe. Reduction roasting of pellets made in a Muffle Furnace saprolite. Further reduction results calcine concentrated using a magnetic separator with a wet method to get the concentrate and tailings. Then the concentrate and tailings were analyzed by Atomic Adsorption Spectrophotometry (AAS) to determine how much increased levels of Ni and Fe. For the experiments used a variable temperature, time and percent reducing agent. Optimal experimental results obtained at T ± 1100 °C, 2% bentonite, 1 hour roasting time. and 12.5% coal. At concentrations increased levels to 1.97% Ni and Fe levels to 19.10%. While the levels of Ni tailings decreased to 1.02% and Fe levels rose to 11. 20%. If the concentrate is melted into NCPI / NPI according to the SS 300 (stainless steel 300) while the tailings when merged into NCPI / NPI according to the SS 200.

STRESS-CORROSION CRACKING IN A NICKEL-BASE ALLOY PRE-HEATER EXPANSION BELLOWS [Stress – Corrosion Cracking In A Nickel – Base Alloy Pre – Heater Expansion Bellows] D N Andyana
Metalurgi Vol 29, No 3 (2014): Metalurgi Vol.29 NO.3 Desember 2014
Publisher : National Research and Innovation Agency (BRIN)

Page 15 of 29 | Total Record : 287

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