https://materialmetalurgi.id/index.php/JMMI/issue/feed Jurnal Metalurgi dan Material Indonesia 2019-01-02T13:30:41+07:00 Dewan Editor materialmetalurgi.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.</p> <ol> <li class="show">Rekayasa struktur dan sifat material</li> <li class="show">Rekayasa proses metalurgi</li> <li class="show">Pengembangan metode karakterisasi material</li> <li class="show">Pemodelan dan simulasi dalam rekayasa metalurgi dan material</li> <li class="show">Pendidikan keilmuan metalurgi dan material</li> </ol> <p>JMMI diterbitkan oleh <strong>Badan Kerja Sama Pendidikan Metalurgi dan Material Indonesia (BKPMM</strong>) per <em>catur wulan</em> yaitu pada bulan akhir April, Agustus, dan Desember. BKPMM merupakan perkumpulan para pengajar/dosen dari program studi atau jurusan yang mengajarkan keilmuan Teknik Metalurgi dan/atau Teknik Material. Hingga tahun 2017, anggota BKPMM berasal dari:</p> <ol> <li class="show">Departemen Teknik Metalurgi dan Material, Universitas Indonesia (UI), Depok</li> <li class="show">Program Studi Teknik Material, Institut Teknologi Bandung (ITB), Bandung</li> <li class="show">Program Studi Teknik Metalurgi, Institut Teknologi Bandung (ITB), Bandung</li> <li class="show">Program Studi Teknik Material dan Metalurgi, Institut Sepuluh November (ITS), Surabaya</li> <li class="show">Jurusan Teknik Metalurgi, Universitas Sultan Ageng Tirtayasa (UNTIRTA), Cilegon</li> <li class="show">Program Studi Teknik Metalurgi, Universitas Jenderal Achmad Yani (UNJANI), Bandung</li> <li class="show">Program Studi Teknik Mesin, Universitas Diponegoro (UNDIP), Semarang</li> <li class="show">Program Studi Teknik Mesin, Universitas Gadjah Mada (UGM), Yogyakarta</li> <li class="show">Program Studi Teknik Mesin, Universitas Sebelas Maret (UNS), Surakarta</li> <li class="show">Politeknik Manufaktur (POLMAN), Bandung</li> <li class="show">Program Studi Teknik Mesin, Universitas Andalas (UNAND), Padang</li> <li class="show">Program Studi teknik Mesin, Universitas Syiah Kuala (UNSYIAH), Aceh</li> </ol> https://materialmetalurgi.id/index.php/JMMI/article/view/13 Addition of Sodium Dodecyl Benzene Sulfonate as Surfactant in Water-based Nanofluid with Al2O3 particles for Quench Medium Application 2018-12-31T18:19:46+07:00 Fatih Abdul Syauqi fatih.abdul@ui.ac.id Achmad Fauzi Trinanda achmad.fauzi51@ui.ac.id M. Asykar Bangun m.asykar@ui.ac.id Ghiska Ramahdita ghiska@metal.ui.ac.id Sri Harjanto harjanto@metal.ui.ac.id Wahyuaji Putra wahyuaji@metal.ui.ac.id <p>Rapid cooling is an important step in the metal heat treatment industry to increase the materials hardness. To obtain this high cooling rate, good quality quench medium is a must. However, low thermal conductivity is a primary limitation in fluid used for this purpose. Nowadays, a higher thermal conductivity fluid are widely developed by using nanofluids. Nanofluids are created by suspending particles with average sizes below 100 nm in fluid base such as water, oil, diesel, ethylene glycol, etc. Aluminium oxide (Al<sub>2</sub>O<sub>3</sub>) can be used as mentioned particle because of its high thermal conductivity characteristic. In addition, the thermal conductivity of Al<sub>2</sub>O<sub>3</sub> will increase with the decreasing of the particle size because the surface area of the particle increased.However, Most of the nanofluids with Al<sub>2</sub>O<sub>3</sub> particle are prepared by using an ultrasonic stirring which is not stable for a longer time. Therefore, surfactant is needed to stabilize the nanofluid.In this research, 1 – 5% of sodium dodecyl benzene sulfonates (SDBS) was added as surfactant into 100 ml water-based nanofluid with 0.5% volume Al<sub>2</sub>O<sub>3</sub>. Commercial grade Al<sub>2</sub>O<sub>3</sub> powder was used in the experiment and milled for 10 hours at 500 rpm. As for surfactant, a commercially available household bodycare product which contain SDBS was used. Initial result by Scanning Electron Microscope showed that the particle size after milling were more than 100 nm. This nanofluid was then used as quenching medium for S45C medium carbon steel which heated at 1000°C for 1 hour. Hardness and microstructure observation were conducted for the steel samples. From the hardness result, SDBS addition lower the hardness of quenched S45C sample to 568 HV, compared with 636 HV for nanofluid without SDBS. This mean that SDBS reduce the cooling rate of nanofluid quenchant.</p> 2018-12-31T18:18:41+07:00 ##submission.copyrightStatement## https://materialmetalurgi.id/index.php/JMMI/article/view/16 Pengaruh Penambahan Aluminium Oksida Terhadap Kekerasan dan Struktur Mikro Paduan Mg-Sn 2019-01-02T08:40:25+07:00 Ayuda Darmawan Yulianto ayuda.darmawan@gmail.com Muhammad Reza Parega rezaparega123@gmail.com Kusharjanto Suhirman kusharjanto@lecture.unjani.ac.id Supono Adi Dwiwanto dwiwanto_sa@yahoo.com <p><em>This paper focused on hardness and </em><em>microstructure of Mg-Sn alloy by Aluminium Oxide</em><em> addition. Mg-Sn alloys were prepared by casting with the addition of Aluminium Oxide</em><em> from 1% to 5%wt, then quenching to the water. The microstructure evolution and hardness were investigated. </em><em>Based on hardness test result the hardness was increased. With 1% to 5% Aluminium Oxide</em><em> addition, hardness increased from 22.9 BHN to 30.8 BHN. The highest hardness was in the addition of 5% Aluminium Oxide</em><em> with 30.8 BHN. The result showed that increasing of Aluminium Oxide</em><em> content resulted the globular and smaller grains. </em></p> 2018-12-31T00:00:00+07:00 ##submission.copyrightStatement## https://materialmetalurgi.id/index.php/JMMI/article/view/20 Pengaruh Komposisi Cairan Additif Terhadap Kuat Tekan Dan Daya Infiltrasi dalam Pengembangan Pervious Paving Block Ramah Lingkungan 2019-01-02T11:29:54+07:00 Afrian Wira Wardhana afrianwirawardhana@gmail.com Amirin Kusmiran amirin19@gmail.com Andy Tirta tirta78@gmail.com <p>Analysis of compressive strength and infiltration pervious paving was performed by falling head method at 7, 14, and 28 days with variation of additive composition by 70 ml, 140 ml, 210 ml, and 280 ml. The addition of lignosulfonat acid additive in the pervious paving making mixture affects the mechanical properties of pervious paving such as compressive strength, permeability and cement bonding time. The results showed the most significant increase in compressive strength occurred during baseline time. Addition of lignosulfonat acid additive affects the acceleration of hydration power of cement up to 2.6 times of normal binding time. Pervious paving infiltration test results showed that the higher content of additive contained, the smaller the permeability. So we get the optimum composition of 140 ml additive substances with a compressive strength of 19.4 MPa and permeability of 0.367 cm / sec.</p> 2018-12-31T00:00:00+07:00 ##submission.copyrightStatement## https://materialmetalurgi.id/index.php/JMMI/article/view/21 Effect of Hydroxyapatite on Microstructure and Hardness of Mg-Al-Zn Alloy 2019-01-02T11:56:54+07:00 Andy Saputro andyysaputroo@gmail.com Intan Khoerunisa intankh26@gmail.com Kusharjanto Suhirman kusharjanto@lecture.unjani.ac.id Supono Adi Dwiwanto dwiwanto_sa@yahoo.com <p>This paper focused on microstructure and hardness of Mg-Al-Zn alloy by Hydroxyapatite addition. Mg-Al-Zn alloys were prepared by casting with the addition of Hydroxyapatite from 1,5% to 2,5%wt, then water quenched. The microstructure evolution and hardness were investigated. The result showed that increasing of Hydroxyapatite content made the globular and smaller grains. Based on hardness test result the hardness was increased. With 1,5% to 2,5% Hydroxyapatite addition, hardness increased from 75.52 HV to 82.82 HV. The highest hardness was in the addition of 2.5% Hydroxyapatite with 82.82 HV.</p> 2018-12-31T00:00:00+07:00 ##submission.copyrightStatement## https://materialmetalurgi.id/index.php/JMMI/article/view/22 Studi pengaruh temperatur dan konsentrasi ion klorida terhadap korosi sumuran dan Critical Pitting Temperature material UNS S31603 2019-01-02T12:42:16+07:00 Bambang Widyanto bambwid98@gmail.com Catia Julie Aulia catiajulie@gmail.com <p>This experiment simulates a pitting corrosion on UNS S31603 with a variation of temperature and concentration of chloride ions through immersion testing based on ASTM G48 Method E to determine Critical Pitting Temperature. Solution containing FeCl3.6H2O, HCl 37%, and reagent water was used. The tests carried out at temperatures 10oC, 20oC, 25oC, 30oC, and 35oC with variation of chloride ion concentration; 2M; 2.25M; and 2.5M. The immersion test was performed for 24 hours for each specimen with stirring speed 300 rpm. The test results show that the temperature and concentration of chloride ions influence the formation of pitting on UNS S31603 specimens. An increment in temperature will accelerate the reaction rate so the number of pit increases. An increment in the concentration of chloride ions accelerate the dissolution of passive layer on the specimen’s surface, beside increase of the number of pits and increase of depth, there is also other phenomenon where the pits gradually interconnected each other due to the adjacent pits position. The concentration of chloride ions would affect the Critical Pitting Temperature.</p> 2018-12-31T00:00:00+07:00 ##submission.copyrightStatement## https://materialmetalurgi.id/index.php/JMMI/article/view/18 Inspeksi Korosi Sambungan Las FGHAZ-CGHAZ Menggunakan Metode Magnetic Flux Leakage pada Pipa Penyalur Gas 2019-01-02T13:00:34+07:00 Ekha Panji Syuryana ekha.panji@lecturer.unjani.ac.id Kusharjanto Suhirman kurharjanto@lecture.unjani.ac.id <p><em>The welded joints are important factors that have an influence on the integrity of the pipeline. The microstructure differences in FGHAZ (fine grain heat affected zone) and CGHAZ (coarse grain heat affected zone) may potentially lead to micro galvanic corrosion reactions. Corrosion resistance to the weld section needs to be analyzed by ICDA (internal corrosion direct assessment), ECDA (external corrosion direct assessment) and In-line Inspection </em><em>(ILI) </em><em>type MFL (magnetic flux leakage) to mapping the condition of corrosion damage to pipelines on external and&nbsp; internal surfaces. Based on MFL inspection result in gas pipe case study with 28 in x 55 km, 0.500 in wall thickness, API 5L X65 indication of damage to weld joints at kilometer point 13 + 2216, defect orientation at 7:43 h, with 25% depth, axial length 116 mm, 67mm circular width and point kilometer 13 + 2219 defect orientation at 8:22, with a depth of 30%, axial length of 77 mm, 40 mm circular width. This pipeline supplies gas with 98.837% methane and 0.107% CO2 impurities</em></p> 2018-12-31T00:00:00+07:00 ##submission.copyrightStatement## https://materialmetalurgi.id/index.php/JMMI/article/view/14 Effect of Sodium Dodecyl Benzene Sulfonate Addition as Surfactant in Carbon Nanofluid for Quench Medium Application 2019-01-02T13:30:41+07:00 Maulana Naufalino maulana.naufalino@ui.ac.id Mohammad Ilham Daradjat mohammad.ilham61@ui.ac.id Ravanya Nabilla Ramadhani Parawansa ravanya.nabilla@ui.ac.id Benediktus Ma'dika benediktus.madika@ui.ac.id Ghiska Ramahdita ghiska@metal.ui.ac.id Sri Harjanto harjanto@metal.ui.ac.id Wahyuaji Narottama Putra wahyuaji@metal.ui.ac.id <p><em>Nanofluids, which are fluids containing suspensions of nanoparticles, have been reported to have higher thermal conductivity than conventional fluid, e.g. water, oil, etc. Because of this characteristic, nanofluids are very attractive in heat transfer applications, such as quenching medium for heat treatment process. This unique characteristic is caused by the nanoparticles inside the fluid that have higher thermal conductivity, thus perform better on heat absorption and heat transfer. By varying the nanoparticles content in the fluid base, the cooling rate can be controlled in accordance with the desired characteristics of the material. Carbon is used as a nanoparticle because of the low cost and environmental friendly characteristics, but still have relatively high thermal conductivity. Unfortunately, carbon nanoparticle is highly hydrophobic. Therefore, surface modification is needed by using surfactant in the nanofluids. In this paper, Sodium D</em><em>odecyl B</em><em>enzene S</em><em>ulfonate (SDBS) was used as surfactant from 1, 3, and 5% in 100 ml water-based nanofluid with 0.5% volume carbon. The carbon powder used in this research was commercial grade, and ball-milled for 10 hours at 500 rpm to reduce the particle size. Commercially available household bodycare product which contain SDBS was used for surfactant source. Scanning Electron Microscope (SEM) showed that the particle size after milling were roughly 10 µm. Medium carbon steel, S45C, was heated at 1000°C for 1 hour, and then quenched using this nanofluid. Microstructure observation showed martensite phase formation after quenching. Hardness test confirmed this phase, showing hardness up to 949 HV after quenching using surfactant added nanofluid.</em></p> 2018-12-31T00:00:00+07:00 ##submission.copyrightStatement##