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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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KETAHANAN AUS ABRASIF DARI BEBERAPA JENIS MODIFIKASI 13Cr BAJA TAHAN KARAT MARTENSITIK [The Wear Abrasion Resistant of Modifications of 13Cr Martensitic Stainless Steel] Moch. Syaiful Anwar
Metalurgi Vol 30, No 3 (2015): Metalurgi Vol. 30 No. 3 Desember 2015
Publisher : National Research and Innovation Agency (BRIN)

Tulisan ini menyajikan ketahanan aus abrasi baja tahan karat martensit 13Cr dan modifikasinya. Sebanyak empat jenis modifikasi 13Cr stainless steel dipersiapkan untuk dilakukan proses peleburan secara induksi dan kemudian di cor menjadi ingot balok. Setelah melalui proses pengecoran, masing-masing ingot tersebut dilakukan proses tempa panas (hot forging) dan proses perlakuan panas pendinginan cepat (quenching) serta tempering. Empat jenis sampel baja tersebut dilakukan uji abrasi di bawah kertas amplas no. 120 dengan kecepatan putar 100 rpm pada pembebanan 100, 500 dan 1000 g, dan dengan jumlah putaran 100, 300, 500, 700 dan 1000 putaran. Hasil pengujian menunjukkan bahwa sifat ketahanan aus abrasi yang paling tinggi terdapat pada sampel baja tahan karat martensitik 13Cr3Mo3Ni dengan nilai kehilangan berat 43,13 mg/cm² dan kekerasan 47,5 HRc. Sedangkan sifat ketahanan aus abrasi yang paling rendah terdapat pada sampel baja tahan karat martensitik 13Cr dengan nilai kehilangan berat 63,87 mg/cm² dan kekerasan 47,7 HRc. AbstractThe several components of steam turbine like the stator and rotor blade suffer from various kind of wearcaused by solid particle erossion during turbine running. This paper presents the wear abrasion resistance of13Cr martensitic stainless steel and its modifications. Four types of modification of 13Cr stainless steel isprepared with induction melting process and then cast into ingot molds. After casting process, each of ingotis conducted hot forging process followed by quenching and tempering process. Then the four type ofstainless steel were conducted abrasion test against 120 SiC grinding paper, speed 100 rpm, load 100, 500and 1000 g, and cycle 100, 300, 500, 700 and 1000 cycles. The results show that the higher wear abrasionresistant was found in the 13Cr3Mo3Ni martensitic stainless steel with weight loss of 43.13 mg/cm² andhardness of 47.5 HRc. The lower wear abrasion resistant was found in the 13Cr martensitic stainless steelwith weight loss of 63.87 mg/cm² and hardness of 47.7 HRc.

Pengaruh Substrat Terhadap Kekerasan Lapisan NiCoCrAlY Yang Terdeposisi Dengan Teknik HVOF [Effect of Different Substrate on Hardness Properties of NiCoCrAlY Coatings Deposited by HVOF Technique] Resetiana Dwi Desiati; Eni Sugiarti; Endro Junianto; Erie Martides; Budi Prawara
Metalurgi Vol 32, No 2 (2017): Metalurgi Vol. 32 No. 2 Agustus 2017
Publisher : National Research and Innovation Agency (BRIN)

Micro structure and micro hardness characterizations have been done on NiCoCrAl coating sample deposited on different substrate, i..e, carbon steel, nickel chrome and hastealloy. NiCoCrAlY coating was deposited by high velocity oxy fuel (HVOF) thermal spraying technique. Characterization and measurents were applied on all cross section samples. Micro structural analysis was characterized by optical microscope with 40x magnification. Moreover, micro hardness tester was utilized to measure the hardness of the sample with 300 gf for 13 second. The hardness data was measure by calculating the average of 3 position of hardness measurement on substrate before coating, after coating and NiCoCrAl coating layer. According to micro structural analysis, it reveald that the thickness of NiCoCrAlYcoating layer was about 370.76 mm, 92 mm, dan 29 on carbon steel, nickel chrome and hastealloy substrate, respectively. Surface morfology showed that the coated layer was not flat and porous structure or void on the coated layer. The porosity of the coated layer might effect the mechanical properties of the sample where high procentase of porosity might reduce the hardness of the sample. The hardness of NiCoCrAlY coating was about 349.95 , 315.60 and 311.30 HV for carbon steel, nickel chrome and hastealloy substrate, respectively. The distance from interface between coating layer and substrate might effect hardness measurement where closer to interface could decrease hardness value and it might caused by interdiffusion of coating elements thus effect to its mechanical properties. AbstrakTelah dilakukan karakterisasi strukturmikro dan kekerasan mikro pada lapisan NiCoCrAlY yang dideposisikan di atas substrat yang berbeda yaitu baja karbon, nikel krom dan hastealloy. Lapisan NiCoCrAlY dideposisikan menggunakan teknik penyemprotan HVOF (high velocity oxy fuel). Proses karakterisasi dan pengukuran dilakukan pada seluruh lapisan dengan irisan melintang. Karakterisasi strukturmikro diamati dengan menggunakan mikroskop optik dengan perbesaran 40x. Selanjutnya untuk pengukuran kekerasan menggunakan kekerasan mikro dengan beban 300 gf selama 13 detik. Data pengujian kekerasan diperoleh dengan mengukur nilai rata-rata dari 3 posisi uji kekerasan pada masing-masing bagian substrat sebelum dilapisi, setelah dilapisi dan lapisan NiCoCrAlY. Berdasarkan hasil karakterisasi strukturmikro diketahui bahwa lapisan NiCoCrAlY berhasil terdeposisi dengan ketebalan 370,76 mm, 92 mm, dan 115,73 mm masing-masing di atas substrat baja karbon, nikel krom dan hastealloy. Morfologi permukaan lapisan menunjukkan bahwa lapisan yang terdeposisi tidak begitu rata dan masih tampak adanya pori atau lubang di area lapisan NiCoCrAlY yang terbentuk. Porositas dari lapisan sangat berpengaruh pada sifat mekanik, semakin tinggi persentase porositas lapisan maka kekerasan akan menurun. Nilai kekerasan lapisan NiCoCrAlY pada substrat baja karbon adalah sebesar 349,95 HV, nikel krom sebesar 315,60 HV dan hastealloy sebesar 311,30 HV. Jarak dengan interface mempengaruhi pengukuran kekerasan. Semakin dekat dengan interface akan semakin menurun nilai kekerasaannya. Hal ini dipengaruhi oleh daerah interdifusi elemen pelapis sehingga mempengaruhi kekuatan mekaniknya.

PRELIMINARY STUDY OF MATERIAL PROPERTIES ON PU-MG-ZN FOR ANEURYSM CLIP APPLICATION Made Subekti Dwijaya; Talitha Asmaria
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.

MASIH TERBUKANYA PELUANG PENELITIAN PROSES CARON UNTUK MENGOLAH LATERIT KADAR RENDAH DI INDONESIA Puguh Prasetiyo
Metalurgi Vol 26, No 1 (2011): Metalurgi Vol. 26 No. 1 April 2011
Publisher : National Research and Innovation Agency (BRIN)

Indonesia memiliki cadangan nikel pada peringkat dua dunia. Cadangan tersebut berupa bijih nikel oksida yang lazim disebut laterit, berada di Kawasan Timur Indonesia (KTI) terutama di Sulawesi Tenggara dan Halmahera. Adapun laterit terdiri dari limonit berkadar Ni<1,5 % dan saprolit berkadar Ni>1,5 %. Laterit kadar tinggi saprolit berkadar Ni>1,8 % sudah diolah di Sulawesi Tenggara dengan jalur pyrometalurgi oleh PT Antam (Aneka Tambang) untuk memproduksi FeNi (ferro nikel) di Pomalaa, dan PT INCO Canada untuk memproduksi nikel mattte (Ni-matte) di Soroako. Laterit kadar rendah yang terdiri dari limonit dan saprolit dengan kandungan Ni<1,8 %, belum diolah di dalam negeri. Secara komersial untuk mengolah laterit kadar rendah digunakan proses Caron yang pertama kali dibangun di Nicaro Cuba oleh Freeport USA pada tahun 1942. Atau proses HPAL (High Pressure Acid Leaching) juga pertama kali dibangun di Moa Bay Cuba oleh Freeport USA pada tahun 1959. Kedua proses tersebut tergolong dalam jalur hydrometalurgi, dan pemilihan proses tergantung dari kondisi bijih terutama pada kandungan Mg (magnesium). Laterit kadar rendah dengan kandungan Mg (magnesium) rendah (Mg < 6 % atau MgO < 10 %) lebih sesuai untuk diolah dengan proses HPAL, dan magnesium tinggi (Mg > 6 % atau MgO > 10 %) diolah dengan proses Caron. Dalam perkembangannya setelah tahun 1990-an, proses Caron mulai ditinggalkan karena mengkonsumsi energi tinggi dengan perolehan yang rendah untuk nikel (Ni : 70 – 80 %) maupun kobal (Co maks 50 %). Selanjutnya beralih ke proses HPAL karena proses ini mengkonsumsi energi rendah dengan perolehan tinggi untuk nikel (Ni > 90%) maupun kobal (Co > 90 %). Dengan melihat kenyataan kegagalan tiga HPAL plant generasi kedua di Australia (Bulong tutup 2003, Cawse tutup 2008, dan Murrin Murrin berpindah kepemilikan ke Minara pada 2003/2004 dan beralih ke heap leach tahun 2007). Serta masih berlangsungnya Caron plant di Cuba (Nicaro dan Punta Gorda), Queensland Nickel di Yabulu Australia, dan Tocantin Brasilia. Maka proses Caron masih punya peluang untuk mengolah laterit kadar rendah di Indonesia. Peluang tersebut semakin terbuka apabila perolehan metal (recovery Ni dan Co) pada proses Caron bisa ditingkatkan setara dengan perolehan metal (recovery Ni dan Co) pada proses HPAL, dan ekonomis konsumsi energinya. AbstractIndonesia had the resources of nickel at the second in the world. The resources are nickel oxide which said laterite. The abundant of laterite locate at Sulawesi Tenggara (South-East Sulawesi) and Halmahera. There are two main mineral in laterite, limonit contains Ni<1,5% and saprolit contains Ni>1,5%. The high grade nickel saprolit contains Ni>1,8% has been processed in Sulawesi Tenggara to produce FeNi (ferro nickel) in Pomalaa by PT Antam, and to produce Ni-matte (nickel matte) in Sorowako by PT INCO Canada. The low grade laterite (limonit and saprolit contains Ni<1,8%) not yet processed in Indonesia. To process the low grade laterite are used Caron’s process or HPAL’s process (High Pressure Acid Leaching). The condition of laterite’s ores are used to choice the process. The Caron’s process is remained after 1990’s because it consume high energy with low metal recovery (Ni : 70 – 80 % Co max 50 %). The choice to process low gradelaterite is HPAL because it consume low energy wiyh high recovery of metal (Ni > 90 % and Co > 90 %). The fact three HPAL plant in Australia unsuccessful (Bulong closed on 2003, Cawse closed on 2008, and Murrin Murrin taked over by Minara and change to heap leach on 2007) and the Caron plant still exist in Cuba (Nicaro and Punta Gorda), Queensland Nickel di Australia, and Tocantin Brasilia. Then Caron’s process still have opportunity to process the low grade laterite in Indonesia if the recovery of metal can be increase as same as HPAL and the consume of energy can be decreased.

SIFAT MAGNET BARIUM HEKSAFERIT BaO.6Fe2O3 HASIL SINTESIS DENGAN METODA KIMIA BASAH[Barium Hexaferrite BaO.6Fe2O3 Magnetic Properties Synthesized with a Wet Chemicals Method] Didin S Winatapura; Sari H Dewi; Yustinus P; Ridwan Ridwan
Metalurgi Vol 28, No 1 (2013): Metalurgi Vol.28 No.1 April 2013
Publisher : National Research and Innovation Agency (BRIN)

Pengaruh Pemesinan Milling Terhadap Kekasaran Permukaan Baja Tahan Karat Martensitik Modifikasi Aisi 410 3Mo – 3Ni dan Keausan Material Cutter End Mill [Effect of Milling Machining on Surface Roughness of AISI 410 3Mo-3Ni Martensitic Stainless Steel and W Moch. Syaiful Anwar; Hady Zhakwan Nugroho; Slamet Wiyono; Efendi Mabruri
Metalurgi Vol 33, No 3 (2018): Metalurgi Vol. 33 No. 3 Desember 2018
Publisher : National Research and Innovation Agency (BRIN)

Process of machining always occurs interaction between cutting tool and workpiece causing chisel or cutting knife experience friction and wear. The purpose of this research is to observe the effect of spindle speed and feed rate on surface roughness of martensitic stainless steel modified AISI 410 3Mo-3Ni and wear of cutter end mill. The method of variance analysis is used in the analysis of machining results. The result of this research is the smallest surface roughness value obtained at 1300 rpm of spindle speed cutting and 190 mm/min of feed rate. The largest surface roughness value obtained on 950 rpm of spindle speed and 760 mm/menit of feed rate. Then, the smallest wear value of edge of cutter endmill of 40.16 μm is found on spindle speed variation of 950 rpm and feed rate 190 mm/min and the largest wear value of edge of cutter end mill of 255.23 μm is found on spindle speed variation of 1300 rpm and feed rate 760 mm/min AbstrakProses pemesinan logam selalu terjadi interaksi antara alat potong dengan benda kerja yang menyebabkan pahat atau pisau potong mengalami gesekan dan keausan. Tujuan dari penelitian ini mengetahui pengaruh kecepatan putar spindel dan kecepatan pemakanan terhadap tingkat kekasaran permukaan baja tahan karat martensitik modifikasi AISI 410 3Mo-3Ni dan keausan material cutter end mill. Metode analisis variasi digunakan dalam analisis hasil pemesinan. Hasil dari penelitian ini adalah nilai kekasaran permukaan terkecil didapat pada kondisi pemotongan kecepatan putar spindel sebesar 1300 rpm dan kecepatan pemakanan 190 mm/menit. Nilai kekasaran permukaan terbesar didapat pada kecepatan putar spindel sebesar 950 rpm dan kecepatan pemakanan 760 mm/menit. Kemudian, nilai keausan tepi mata cutter end mill terkecil didapat pada variasi kecepatan putar spindel sebesar 950 rpm dan kecepatan pemakanan 190 mm/menit sebesar 40,16 µm dan nilai keausan tepi terbesar dihasilkan pada variasi kecepatan putar spindel sebesar 1300 rpm dan kecepatan pemakanan 760 mm/menit sebesar 255,23 µm.

PENGARUH KONSENTRASI x=0,35 TERHADAP SIFAT LISTRIK DAN MAGNETIK PADA KRISTAL TUNGGAL La2-2xSr1+2xMn2O7[Effect of Consentration of x=0.35 on the Electric and Magnetic Properties Of La2-2xSr1+2xMn2O7 Single] Agung Imaduddin
Metalurgi Vol 27, No 2 (2012): Metalurgi Vol. 27 No. 2 Agustus 2012
Publisher : National Research and Innovation Agency (BRIN)

APLIKASI SEVERE PLASTIC DEFORMATION (SPD) DAN HEAVY COLD ROLLING PADA BAJA TAHAN KARAT AUSTENITIK 316L[The Application of Severe Plastic Deformation (SPD) and Heavy Cold Rolling of Austenitic Stainless Steel 316L] Efendi Mabruri
Metalurgi Vol 27, No 1 (2012): Metalurgi Vol. 27 No. 1 April 2012
Publisher : National Research and Innovation Agency (BRIN)

cover, daftar isi, abstrak vol 36 Desember 2021 Lia Andriyah
Metalurgi Vol 36, No 3 (2021): Metalurgi Vol. 36 No. 3 Desember 2021
Publisher : National Research and Innovation Agency (BRIN)

MONASITE BANGKA DAN ALTERNATIF PROSES PENGOLAHANNYA Rudi Subagja
Metalurgi Vol 29, No 1 (2014): Metalurgi Vol.29 No.1 April 2014
Publisher : National Research and Innovation Agency (BRIN)

Page 11 of 29 | Total Record : 287

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