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INDONESIA
Jurnal Metalurgi dan Material Indonesia
Published by Badan Kerjasama Pendidikan Metalurgi dan Material
ISSN : 26544962     EISSN : -     DOI : -
Core Subject : Science, Engineering,
Automotive Engineering Chemistry Engineering Industrial & Manufacturing Engineering
Jurnal Metalurgi dan Material Indonesia (JMMI) merupakan terbitan berkala makalah ilmiah mencakup keilmuan teknik metalurgi (metallurgy) dan teknik material (materials science and engineering). JMMI diterbitkan oleh Badan Kerja Sama Pendidikan Metalurgi dan Material Indonesia (BKPMM) per catur wulan yaitu pada bulan akhir April, Agustus, dan Desember.
Arjuna Subject : Energi (semua kategori) - Energi (Lain-Lain)
Articles 42 Documents
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Analisa Kegagalan Tubing Hidraulik untuk Instrumen Nadya Laurenza; Arie Wibowo; Husaini Ardy
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 3 (2019): Desember
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

Hydraulics tubing austenitic stainless steel 316L for offshore instrument was failed due to pitting corrosions attack. This research aims to determine the root causes of tube leakage by visual examination of new and failed tube, scanning electron microscope (SEM) examination, deposits analysis by energy dispersive spectroscope (EDS), and microstructural analysis by light microscope. The examination results show that pitting corrosions were originated from surface defects as residences for deposit and marine growth. Pitting corrosions form a tunneling underneath the surface which one of the characteristic of sulpfhur reduced bacteria (SRB) corrosion. This conclusion is also supported by high sulphur concentration in surface deposit as a results of bacteria metabolisms and formation of FeS compound. Crevice corrosion also contributed to pitting formation because critical crevice temperature of 316L tubing material is around 10oC, lower than the service environment temperature. These two corrosion modes may occur separately or combined. Surface defects might be originated from improper handling, storage, or during construction, which induce scratches on tubing surface. To prevent pitting corrosion reoccurence, it is recommended to use fire retardant polyurethane thermoplastic rubber sheathing stainless steel 316L tube or superduplex stainless steel tube material which critical crevice temperature is 35˚C.
Komposit Grafit-Polistirena Diperkuat Poliuretan sebagai Penyerap Gelombang Akustik : Fabrication of Polyurethane Composite Foam with Graphite-Polystyrene Filler for Improved Sound Absorption Adhi Satriyatama; Haris Amaldi; M. Maulana Ibrahim; Aditianto Ramelan
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 3 (2019): Desember
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

Noise, harshness, and vibration (NHV) are problems encountered when driving a vehicle. This can cause serious problems for drivers if exposed to NHV for a long time. In order to avoid the NHV, vehicle are equipped with acoustic tile which functions to absorb vibration from the sound wave and reduce the noise caused by the vehicle’s engine. Polyurethane foam is commonly used as a sound absorption material because of its high sound absorption efficiency. The study aimed at investigating polystyrene (PS) and graphite (G) fillers with polyurethane matrix for improving acoustic property. The research started with optimization of composite that characterized using sound absorption intensity parameters at frequencies of 50 Hz-6000 Hz, and the optimum results obtained at matrix/filler 92.8%wt. The composite morphology is analyzed using SEM-EDX, optical microscopy, and the density. Mechanical test is conducted using Universal Testing Machine (UTM) and achieved the optimum compressive strength at 60G/40PS with 0.65 MPa. The absorption of acoustic waves property was tested in the frequency range 50 Hz-6300 Hz using an impedance tube and obtained the optimum composition at 0G/100PS.
Pengaruh Perlakuan Alkali-silan terhadap Sifat Mekanis Komposit Hibrid yang Diperkuat Serat Agel dan Serat Gelas : Effect of Alkali-Silane Treatment on Mechanical Properties at Glass Fabric and Woven Agel (Corypha gebanga) Reinforced Hybrid Composites Hendri Hestiawan; Jamasri; Kusmono
Jurnal Metalurgi dan Material Indonesia Vol. 3 No. 1 (2020): April
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

The aim of this research is to investigate the effect of alkali-silane on mechanical properties at glass fabric and woven agel (Corypha gebanga) reinforced hybrid composites. The materials used are woven agel fiber, glass fabric, unsaturated polyester resin of yukalac 157 BQTN, and catalyst of methyl ethyl ketone peroxide. Manufacturing techniques used vacuum bagging with a suction pressure of 70 cmHg at room temperature. The woven agel were treated with 4% sodium hydoxide solution for 1 hour, 5% silane solution for 3 hours, and a combined sodium hydoxide and silane solution. The tensile, flexural, and impact test specimens based on ASTM D 638-02, D 790-02, and D 5942-96 standards respectively. The results of tensile, flexural, and impact tests showed that the highest tensile and flexural strength, and impact toughness ​​were obtained on alkali-silane treated hybrid composites, i.e. 78 MPa, 116 MPa, and 38 kJ/m2 respectively. It can be concluded that the alkali-silane treatment effectively improves the mechanical properties of at glass fabric and woven agel reinforced hybrid composites
Analisis Parameter Proses Atomisasi Sentrifugal Tipe Elektroda Berputar dan Karakterisasi Serbuk Hasil Atomisasi pada Material Baja Paduan: Parameters Analysis of Centrifugal Atomizing Process of Rotating Electrodes Type for Alloy Steel Materials and Characterization of Atomized Powder Thomas Albatros; Dr. Ir. Slameto Wiryolukito
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 3 (2019): Desember
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

Small components that have complicated geometry and precise dimensions are suitable to be produced by using powder metallurgy method. In Indonesia, powder metallurgy is not well developed, one of the causes is dependence on imported powders. This study discusses the effect of various parameters of making metal powders using centrifugal atomization machines on the character of the powders produced. The research includes the improvement of atomization tools, powder making, milling process, followed by the characterization process to determine the powder morphology, powder size distribution, and compounds formed from the resulting powder. The process parameters tested in this study are the type of raw material, the anode's rotational speed, and the amount of electric current applied. The raw materials used are reinforced steel, AISI 202, and AISI 304. With variations in rotational speed 4000rpm, 6000rpm and 8000rpm. The increase in rotational speed will reduce the size of the powder, and increasingly make the powder shaped like a ball. The milling process effectively reduces the size of alloy steel with a reduction of up to 89% in the form of angular powder. The XRD results show that the reinforced steel powder produced by atomization produces Fe2O3 and FeO powder, while AISI 202 and AISI 304 produce Cr2MnO4 compounds.
Pengaruh Waktu Pelapisan Ni dan Komposit Ni/SiC Terhadap Kekerasan dan Ketahanan Abrasi AISI 410 Menggunakan Metode Pulsa Elektrodeposisi Miftakhur Rohmah; Yunita; Moch. Syaiful Anwar; Efendi Mabruri
Jurnal Metalurgi dan Material Indonesia Vol. 3 No. 1 (2020): April
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

Stator and Rotor Blades often experience abrasion wear failure during the steam turbine operation, primarily due to solid erosion particles. The Ni-SiC composite coating was prepared on steel by pulse electrodeposition to improve the working life of stator blade steel. This study serves to determine the effect of time coating Ni and Ni-SiC composite on SS 410 on hardness and abrasion resistance. Four samples with 7.9756 x 0.8 x 2.54 cm dimensions were pre-treated; thus, coatings were applied to each sample using watts solution (250 g/l Ni2SO4, 45 g/l H3BO3, and 45 g/l NiCl2, and 30 gr SiC, and 0.25 gr C12H25NaO4S). After coated, Sample 1 and 2 with a difference in Ni coating time are 15 and 60 minutes; Sample 3 and 4 with Ni-SiC coating time is 30 and 90 minutes was observed by hardness and abrasion test. The highest hardness (292.8 HVN) and weight loss of abrasion (13 milligrams) were obtained by 60 minutes coating time of Ni and followed 90 minutes coating time of Ni-SiC. The increase in the time coating of Ni and Ni-SiC composite, the level of hardness layer increases. The abrasion resistance value of the composite layers in the four samples did not show a linear increase with an increase in the value of hardness
Karakterisasi Kekuatan Lelah Siklus Rendah Besi Cor Kelabu: Characterization of Low Cycle Fatigue Strength of Gray Cast Iron Agus Suprihanto; Dwi Basuki Wibowo; Djoeli Satrijo
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 3 (2019): Desember
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

Low cycle fatigue testing has been carried out on gray cast iron. 60 specimens made of three FC200 gray cast iron alloys with Cr (0.23%, 0.32% & 0.47% wt) and Cu (0.6% -0.7%) were tested using a servo pulse machine. Specimen dimensions refer to ASTM E739 standard. Low cycle fatigue testing used strain amplitudes between 0.15 to 0.5%. The fatigue behavior is characterized using Downing and Fash method. The analysis shows that the coefficient of fatigue strength (A) is between 2.336 –2.896 and the exponent of fatigue strength is between -0.251 to –0.266.
Komposit Aluminium 1100 ‐ Nano Alumina Metode Dispersi Mekanik Screen Printing dan Ultrasonic Fogger Accumulated Roll Bonding: Aluminum 1100 - Nano Alumina Composite with Mechanical Screen Printing and Ultrasonic Fogger Dispersion Method on Accumulated Roll Bonding Process Riska Rachmantyo; Aditianto Ramelan; Firmansyah Sasmita
Jurnal Metalurgi dan Material Indonesia Vol. 3 No. 1 (2020): April
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Aluminum material that is commonly used in life. This material is lightweight, corrosion resistant, tough and good working process. However, strength and hardness are lower than other metals such as steel. Processing needs to be done to get better aluminum mechanical properties. In this study, making a metal matrix composite in which aluminum 1100 as a substrate and 10 nm nano alumina (Al2O3) powder as a reinforcement. The process of making composites uses the method of accumulated roll bonding. The distribution of alumina powder on the aluminum matrix greatly influences the mechanical properties produced, namely its strength and hardness. The distribution process of nano alumina is carried out using screen printing, spray and ultrasonic spray methods. Besides the distribution method, the amount of alumina is also used as a research parameter. Improved optimum mechanical properties were obtained from the ultrasonic spray spray distribution method with the addition of 5 w/0 alumina.
Studi Pengaruh Temperatur terhadap Laju Erosi-Korosi Baja API 5CT L80 dan API 5L X60 pada Lingkungan CO2 dan Asam Asetat Bambang Widyanto; Anthonius Valentino; Abdullatief Zuhdy
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 3 (2019): Desember
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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In this study, test was conducted to determine the effect of temperature with CO2 and acetic acid environment on the corrosion rate of API 5CT L80 and API 5L X60 steel pipe. Corrosion immersion test was held using modified pressurized autoclave which allow movement in testing fluid to simulate erosion condition. Each test conducted for 168 hours with 2 bar of pressurized CO2 in the system, testing fluid with 3360 ppm acetic acid concentration and four variation of temperature which are 40˚C, 60 ˚C, 80 ˚C and 95 ˚C. Immersion test on API 5L X60 steel specimen as regard to increase of temperature will also increase the value of corrosion rate, mean test on API 5CT L80 steel sample have different corrosion rate trend. Temperature increase from 40 ˚C to 60 ˚C on API 5CT sample will increase the value of the corrosion rate, on the other hand increasing the temperature from 60 ˚C to 80 ˚C will cause the corrosion rate to decrease. The highest value of the corrosion rate on API 5CT L80 observed on 95 ˚C. The value of the corrosion rate each temperature are influenced by the layer of corrosion product formed on the surface of the specimens which analyzed by using scanning electron microscope (SEM) and x-ray diffraction (XRD).
Pengolahan Bittern Sebagai Pembentuk Pupuk Struvite Menggunakan Reaktor Sekat Secara Sinambung Herdiana Septiani; Nikmatuz Zahra; Sutiyono; Luluk Edahwati
Jurnal Metalurgi dan Material Indonesia Vol. 3 No. 1 (2020): April
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Waste salt or bittern is the residual liquid from the salt formation which can not be precipitated again or also can be obtained from the washing water remaining in the purification process. Bittern contains salt such as MgCl2, MgSO4, KCl, and Br2. From the various minerals contained in the bittern, one of the minerals used as the basic ingredient of making struvite fertilizer, named Magnesium. Bittern has not been utilized significantly, this has become one of the goals and benefits of our research, which is making struvite fertilizer using salt waste, which will add up to it’s economic value. Struvite mineral can also be applied in agriculture such as raw material fertilizer, because struvite fertilizer is very beneficial for the growth and development of the plant. The most beneficial characteristic of struvite fertilizer is the slow release of nutrients so it will lessen fertilizer application on plants. Struvite has a very small solubility in water that is 0.02 gr / 100 ml at 0 ºC. Struvite solution (MAP) can be formed from phosphoric acid, ammonium hydroxide, and bittern or salt waste as a source of magnesium with a molar ratio of 2: 1: 1. PH variations carried out include 7 to 11 and the reactor intake air velocity in the range of 0.25-1.25 l / min in a fixed column operated reactor. The resulting dry sludge was analyzed by XRD method for mineral characterization and SEM to determine the composition and morphology of the crystals..
Analisis Hasil Friction Stir Welding Aluminium 5083-H112 Menggunakan Taper Threaded Cylinder Pin dengan Variasi Kecepatan Rotasi dan Translasi: Result Analysis of Friction Stir Welding of Aluminum 5083-H112 Using Taper Threaded Cylinder Pin with Variation in Rotational and Translational Speed Slameto Wiryolukito; Johanes Pratama Wijaya Wijaya
Jurnal Metalurgi dan Material Indonesia Vol. 3 No. 1 (2020): April
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

The technique of joining aluminum with the conventional fusion welding method is still difficult to be applied, because aluminum series has low weldability, therefore, a new method is developed, friction stir welding (FSW) which is a solid-state welding. In this study, the optimization process of the translation speed was carried out using aluminum 5083-H112 workpiece with a thickness of 10 mm. This optimization process includes observing and testing the effect of translational speed on microstructure, strength, hardness and toughness on the weld area. The tool that is used in this optimization process is a taper threaded cylinder pin type, with pin diameters 4 and 7 mm, pin height 9.5 mm, left hand threaded, and the material used is AISI H13. The optimization process produces 3 translation speed parameters, 31.5 mm/min; 50 mm/min; and 63 mm/min with constant rotational speed, 1250 rpm. These three parameters change the microstructure in the weld area, where there are 3 microstructure areas observed, weld nuggets (WN), thermomechanically affected zone (TMAZ), and heat affected zone (HAZ). Whereas mechanical properties such as strength, hardness and toughness tend to decrease along with the increase in welding translational speed.

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