https://materialmetalurgi.id/index.php/JMMI/issue/feed Jurnal Metalurgi dan Material Indonesia 2020-07-07T10:49:26+07:00 Arif Basuki metalurgimaterial.id@gmail.com Open Journal Systems <p><strong>Jurnal Metalurgi dan Material Indonesia (JMMI)</strong> merupakan terbitan berkala makalah ilmiah mencakup keilmuan teknik metalurgi <em>(metallurgy)</em> dan teknik material (<em>materials science and engineering</em>). Topik-topik pilihan yang termasuk dalam lingkup JMMI antara lain adalah sebagai berikut.<br>&nbsp; &nbsp;1. Rekayasa struktur, sifat, dan degradasi material<br>&nbsp; &nbsp;2. Rekayasa proses metalurgi dan pemrosesan material<br>&nbsp; &nbsp;3. Pengembangan metode karakterisasi material<br>&nbsp; &nbsp;4. Pemodelan dan simulasi dalam rekayasa metalurgi dan material<br>&nbsp; &nbsp;5. Pendidikan keilmuan metalurgi dan material</p> https://materialmetalurgi.id/index.php/JMMI/article/view/80 Pengolahan Bittern Sebagai Pembentuk Pupuk Struvite Menggunakan Reaktor Sekat Secara Sinambung 2020-07-06T09:29:02+07:00 Herdiana Septiani herdianaseptiani1498@gmail.com Nikmatuz Zahra zahranikmatuz11@gmail.com Sutiyono sutiyono13@yahoo.co.id Luluk Edahwati lulukedahwati@gmail.com <p>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 MgCl<sub>2</sub>, MgSO<sub>4</sub>, KCl, and Br<sub>2</sub>. 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..</p> 2020-04-30T00:00:00+07:00 Copyright (c) 2020 Herdiana Septiani, Nikmatuz Zahra zahra, Sutiyono, Luluk Edahwati https://materialmetalurgi.id/index.php/JMMI/article/view/63 Pengaruh Perlakuan Alkali-silan terhadap Sifat Mekanis Komposit Hibrid yang Diperkuat Serat Agel dan Serat Gelas 2020-07-03T20:52:27+07:00 Hendri Hestiawan hestiawan@unib.ac.id Jamasri jamasri@ugm.ac.id Kusmono kusmono@ugm.ac.id <p><em>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 </em><em>of y</em><em>ukalac 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% </em><em>sodium hydoxide </em><em>solution for 1 hour, 5% silane solution for 3 hours, and a combined </em><em>sodium hydoxide </em><em>and silane solution. </em><em>T</em><em>he 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/m<sup>2</sup> 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</em></p> 2020-04-30T00:00:00+07:00 Copyright (c) 2020 hendri hestiawan, Jamasri Jamasri, Kusmono Kusmono https://materialmetalurgi.id/index.php/JMMI/article/view/73 Pengaruh Waktu Pelapisan Ni dan Komposit Ni/SiC Terhadap Kekerasan dan Ketahanan Abrasi AISI 410 Menggunakan Metode Pulsa Elektrodeposisi 2020-07-06T11:27:50+07:00 Miftakhur Rohmah miftakhur.its@gmail.com Yunita miftakhur.rohmah@lipi.go.id Moch. Syaiful Anwar moch026@lipi.go.id Efendi Mabruri effe004@lipi.go.id <p>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 Ni<sub>2</sub>SO<sub>4</sub>, 45 g/l H<sub>3</sub>BO<sub>3</sub>, and 45 g/l NiCl<sub>2</sub>, and 30 gr SiC, and 0.25 gr C<sub>12</sub>H<sub>25</sub>NaO<sub>4</sub>S). 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</p> 2020-04-30T00:00:00+07:00 Copyright (c) 2020 Miftakhur Rohmah, Yunita, Moch. Syaiful Anwar, Efendi Mabruri https://materialmetalurgi.id/index.php/JMMI/article/view/76 Komposit Aluminium 1100 ‐ Nano Alumina Metode Dispersi Mekanik Screen Printing dan Ultrasonic Fogger Accumulated Roll Bonding 2020-07-06T10:00:40+07:00 Riska Rachmantyo rachmantyo@material.itb.ac.id Aditianto Ramelan ramelan@material.itb.ac.id Firmansyah Sasmita firmansyah.sasmita@material.itb.ac.id <p>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.</p> 2020-04-30T00:00:00+07:00 Copyright (c) 2020 Riska Rachmantyo, Aditianto Ramelan, Firmansyah Sasmita https://materialmetalurgi.id/index.php/JMMI/article/view/85 Pengaruh Nikel (Ni) dan Silikon (Si) Terhadap Struktur Mikro, Sifat Kekerasan, Dan Ketahanan Erosi Dari Paduan Aluminium-Nikel-Silikon (Al-Ni-Si) 2020-07-06T16:38:25+07:00 Budi Hartono Setiamarga setiamarga@gmail.com Kus Hanaldi adihanaldi@gmail.com Rahmatul Aulia Jorji Jorji@gmail.com <p><em>Paduan Aluminium sering digunakan untuk berbagai keperluan teknik karena sifatnya yang ringan dan tahan korosi<sup>[1]</sup>. Meskipun demikian, ketahanan erosinya masih perlu ditingkatkan bila hendak diaplikasikan untuk komponen seperti propeler. Pada penelitian ini empat jenis paduan Aluminium-Nikel-Silikon dengan kandungan Al, Ni, dan Si yang berbeda, dileburkan dengan menggunakan tungku listrik. Uji erosive wear dilakukan terhadap keempat jenis paduan Al-Ni-Si dengan menggunakan peralatan Air Jet Erosion dengan serbuk Alumina sebagai partikel abrasifnya. Uji XRD, EDS, metalografi optik, dan uji keras dilakukan untuk memahami sifat erosive wear-nya. Hasil pengujian menunjukkan bahwa senyawa Al<sub>3</sub>Ni yang keras dan getas akan bertambah banyak dan bertambah besar seiring dengan penambahan komposisi nikel. Kekerasan paduan Al-Ni-Si terbukti meningkat seiring dengan bertambahnya komposisi nikel. Meskipun demikian, kenaikan kekerasan ini justru menurunkan laju erosinya akibat makin mudahnya senyawa Al<sub>3</sub>Ni yang terlepas. Penurunan kandungan Silikon akan merubah morfologi fasa silikon dari bentuk serpihan pelat menjadi bentuk serat halus. Penurunan jumlah fasa silikon dapat menurunkan laju erosinya walaupun tidak besar</em>.</p> 2020-07-01T20:59:53+07:00 Copyright (c) 2020 Budi Hartono Setiamarga, Kus Hanaldi, Rahmatul Aulia Jorji https://materialmetalurgi.id/index.php/JMMI/article/view/86 Pengaruh Temperatur, Waktu Pemanasan, dan Komposisi Energizer BaCO3 terhadap Nilai Kekerasan dan Case Depth pada Proses Pack Carburizing Baja Karbon Rendah 2020-07-07T10:06:31+07:00 Alfirano alfirano@untirta.ac.id Rike Kemala Putri rike@gmail.com Anistasia Milandia Anistasia.Milandia@ft-untirta.ac.id <p class="TTPAbstract" style="margin: 0mm 0mm 12.0pt 0mm;"><span style="font-size: 11.0pt;">Low carbon steel produced from the Hot Strip Mill process is widely used for hoe applications. In the application, this steel is expected to have a hardness value of 20 HRC to 41 HRC in accordance with SNI 0331:2011 to avoid failure when experiencing abrasion due to friction with sand and stone. Besides the hoe leaf also requires toughness on the steel core to receive shock loads during agricultural activities. To produce steel with these criteria, a carburizing pack process was carried out. This study was carried to increase the hardness of low carbon steel as a hoe application and determine the optimum temperature, heating time and composition of energizer for the pack carburizing process. In this study, the pack carburizing process was carried out with temperature variations of 850°C to 950°C, variations in heating time of 1-5 hours and variations in the composition of BaCO<sub>3</sub> as an energizer of 20% and 80%. To determine the effect of temperature and heating time on hardness and microstructure, carburized steel was characterized for carbon content, hardness testing and metallography. The results of this study indicate that the higher the temperature and the heating time, the hardness of the steel will increase. Microstructure produced after the carburizing pack process is ferrite, pearlite and proeutectoid cementite. The carburizing pack process that produces the best hardness, case depth and microstructure values ​​is at a temperature of 950 ° C for 1 hour in BaCO<sub>3</sub> composition of 20%.</span></p> 2020-04-30T00:00:00+07:00 Copyright (c) 2020 Alfirano, Rike Kemala Putri, Anistasia Milandia https://materialmetalurgi.id/index.php/JMMI/article/view/82 Analisis Hasil Friction Stir Welding Aluminium 5083-H112 Menggunakan Taper Threaded Cylinder Pin dengan Variasi Kecepatan Rotasi dan Translasi 2020-07-07T10:49:26+07:00 Slameto Wiryolukito swmetallurgist@yahoo.com Johanes Pratama Wijaya Wijaya pratama.johanes@yahoo.com <p>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.</p> 2020-04-30T00:00:00+07:00 Copyright (c) 2020 Slameto Wiryolukito, Johanes Pratama Wijaya Wijaya