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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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Perkembangan Simulasi Korosi – Sebuah Ulasan Ringkas Syarizal Fonna; Gunawarman Gunawarman; Syifaul Huzni; Ahmad Kamal Ariffin
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 2 (2019): Agustus
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

Corrosion is metal loss due to interaction with the surrounding environment. The consequences of corrosion are so damaging that they can have an impact on human casualties. A report from NACE in 2002 has shown that corrosion losses in the United States was about 3.1% of Gross Domestic Product (GDP). This figure was expected to increase in 2016 to over 6.2% of GDP. Overall, the losses caused by corrosion have reached 3-4% of the GDP of the industrialized countries. The numbers are very large and therefore, corrosion control are very important to be implemented. In efforts to control corrosion, research in the area has been widely conducted. Experimental research has played a very important role. However, the development of simulations in the world of corrosion is also very promising. Corrosion simulations are developed based on numerical methods. The commonly used numerical method is the boundary element method (BEM). In subsequent developments, the optimization method has also been used in the case of inverse analysis such as corrosion detection. This paper presents briefly the development of corrosion simulation which has been performed by many researchers in efforts to solve various corrosion cases.
Pengaruh Penambahan CuO Sebagai Sintering Aid pada Elektrolit Padat Neodymium Doped Ceria (NDC) Anindityo Anindityo Arifiadi; Syoni Soepriyanto
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 1 (2019): April
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

In this research, NDC powder with a chemical formula of Ce0,75Nd0,25O1,875 added with 0, 0,5, 1, ad 1,5 wt% CuO is synthesized. Powder is mixed by stirring at an ethanol medium. Mixed powder is compacted to form a pellet and then sintered at 1000oC, 1200oC, and 1400oC for 4 hours. Sintering time variation of 2, 3, and 4 hours is also performed at 1200oC. Result shows that the highest relative density of 65,21% is achieved by 0,5wt% CuO addition sintered at 1200oC for 4 hours. Without CuO addition, pellet shrink through grain boundary diffusion and with CuO addition, liquid phase sintering occurs. Electrochemical impedance analysis shows that CuO lowers grain boundary resistance. The highest conductivity (1,52 x 10-2 S/cm) at 700oC with an activation energy of 0,85 eV is achieved by pellet added with 0,5 wt% CuO.
Pengaruh Kadar Resin Terhadap Sifat Fisik dan Kekuatan Tekan Inti Komposit Sandwich Tenunan 3D Serat Gelas – Poliester Hermawan Judawisastra; Handy Budiman; Dodi Ihsan Taufiq
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 1 (2019): April
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

Sandwich composite is made of light and thick core in between two thin skins that has high mechanical properties. This material is famous for application that needs high specific bending strength for example in lightweight panel for wall or floor for lightweight vehicles. Sandwich composite which made by using woven 3D fiber fabric has the highest resistance delamination resistance among other sandwich material. But, core compression strength of this type of sandwich composite is lower compared to honeycomb or balsa sandwich. Composite polymer properties are determined by resin content. In this research, the effect of resin content to compressive strength and physical properties of sandwich composite 3D woven fabric glass fiber – polyester is studied. Sandwich composite is made by hand lay-up method with resin content variation. Physical properties that are evaluated are thickness, density, and fiber volume fraction. Compression strength is determined by using compression strength that follow s ASTM C-365. Impregnation and core construction quality is evaluated by visual and stereo microscope technique. Sandwich composite 3D woven fabric successfully made with good impregnation quality at weigh ratio of fiber : resin 1 : 1, 1 ; 1,1, and 1 : 1,5 with average thickness of 5,49 mm. The increase of resin results in increase of density and core compressive strength of composite sandwich woven 3D fabric. The increase of core compressive strength is caused by forming of polyester network in the column of the composite core.
Repair Welding: Pengaruh Pengelasan Perbaikan Berulang dengan Kombinasi Proses GTAW dan SMAW terhadap Struktur Mikro dan Sifat Mekanik Baja Tahan Karat Dua Fasa Austenitik-Feritik (Duplex) UNS S31803 Febi Dwi Antony; Rini Riastuti; Winarto Winarto
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 2 (2019): Agustus
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

During welding and also in the stages of fabrication and assembly, welding repair sometimes required to eliminate the welding defects present. This paper focuses on the effect of multiple repair welding on microstructure and mechanical properties of Duplex Stainless Steel UNS S31803. Three times welding repair were performed using combination of Gas Tungsten Arc Welding (GTAW) for root pass up to hot passes and Shielded Metal Arc Welding (SMAW) processes for fill passes up to finish passes. The average of heat input used was of 1.5-1.9 kJ/mm. After welding, the test samples were prepared for microhardness test, Charpy impact test, and microstructural examinations. The results showed that there was a significant reduction of Charpy toughness value due to welding process from 339.22 Joules for base metal to 89.22 Joules and 101.23 Joules for average weld metal and fusion zone consecutively. However, the toughness value between each welding repair showed same pattern with no significant reduction or increment of Charpy impact value. Same pattern also observed on microhardness measurement which revealed no significant fluctuation between each welding repair. Furthermore, the morphology of microstructure present in weld metal and heat affected zone area were also investigated to achieve more understanding regarding the effect of multiple repairs to the properties of Duplex weldment. Bearing in mind that at the moment, carrying out just one repair per welded joint especially for Duplex Stainless Steel is advised as the limiting condition.
Karakterisasi Bilah Gamelan Berbahan Kuningan Cu22Zn Melalui Proses HPDC dan Hot Forging Sugeng - Slamet; Qomaruddin Qomaruddin
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 2 (2019): Agustus
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

Alat musik gamelan diproduksi menggunakan material logam non ferro kuningan dan perunggu melalui teknik tempa panas manual forging. Kelemahan teknik tempa dapat menurunkan sifat mekanis paduan akibat deformasi plastis serta energi untuk menempa yang besar. Kualitas bunyi juga semakin menurun pada kurun waktu akibat terbentuknya tegangan sisa. Material yang digunakan dalam penelitian ini Cu-22%Zn. Spesimen bilah gamelan dibuat melalui teknik High Pressure Die Casting/HPDC dengan tekanan kerja 200 MPa. dan teknik hot forging dari proses pengecoran sand casting dengan tingkat reduksi sebesar 5%. Mikrostruktur hasil teknik HPDC menunjukkan butir bulat kasar dan porositas, sedangkan pada teknik tempa panas menghasilkan mikrostruktur pipih memanjang dengan sedikit porositas. Teknik tempa panas menunjukkan kenaikan kekerasan sebesar 62,2% VHN lebih tinggi dibanding teknik cor HPDC. Densitas teknik tempa panas meningkat sebesar 7,9% dengan penurunan porositas sebesar 75,6%. Sound akustik teknik cor HPDC menunjukkan frekuansi alamiah sebesar 354 Hz dan teknik hot forging sebesar 672,7 Hz.
Pengaruh Temperatur dan Rapat Arus Terhadap Kekerasan dan Distorsi Kisi pada Hard Chromium Plating pada Baja Karbon Rendah Riska Rachmantyo; Aditianto Ramelan; Akhmad Zein Eko Mustofa; Asep Ridwan Setiawan
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 2 (2019): Agustus
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

Hard Chromium Plating is one of several coating techniques that has been applied to engineering components. The hard chromium layers have several properties such as, hardness, high corrosion and wear resistance. In fact the quality is determined by several process parameters during electro deposition. In this experiment temperature and current density were varied to observe the effect on the quality of hard chromium layer deposited on a steel base plate. This was to find the appropriate combination of producing deposited layer with the optimum quality. The electroplating process was carried out for 60 minutes at 50, 55 and 60 oC with current density variation of 70, 80 and 90 A/dm2. The specimen were then undergone hardness test and XRD characterization. Maximum hardness measured was 1128 HV this was plated at 55°C with a current density of 80 A/dm2. XRD analysis shown that the increasing hardness of hard chromium plating is related with an increase of microstrain calculated from the diffractogram pattern.
Kompatibilitas Sintering dan Fraksi Volume Terhadap Sifat Mekanik Komposit Hybrid: Compatibility of Sintering and volume fraction on Hybrid Composite Mechanical Properties Agus Pramono; Adhitya Trenggono; Fatah Sulaiman
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 1 (2019): April
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Composite is a combination of two or more of element materials to produce a characteristic that is better than the basic material. The use of two or more elements in the composition of composite materials (Hybrid composite) is expected to combine the properties of each element such as Aluminum which has good elasticity and zinc has good corrosion resistance, graphite has high hardness, and the use of magnesium which is a wettability on good of coupling agent so that the alloy can be used to combine a combination of superior properties in the form of high strength at room temperature, formability and high corrosion resistance. Powder metallurgical technology is very suitable to be applied for the use of more than two elements in the manufacturing of composite materials, because the compressibility of the powder is able to be combined with emphasis and heating, with the use of suitable temperatures. The pressure used is using 200-500 bar on press machine with variations of temperature were 400°C, 450°C and 500°C and variations in volume fraction: 40% Al, 20% Zn, 30% C, 10% Mg: 35% Al, 25% Zn, 30% C, 10% Mg dan 30% Al 30%, Zn, 30% C, 10% Mg. The results of study obtained ideal temperature 400°C, because at this temperature, zinc does not melt, resulting in a bond between the combined elements. At temperatures above 400°C zinc melts and causes a decrease in the mechanical properties of the material. The temperature compatibility of sintering with volume fraction of 35% Al, 25% Zn, 30% C, 10% Mg is able to produce a solid phase in zinc as a matrix with aluminum, the product reaction from composite Al-Zn-C-Mg hybrids which are scattered Al12Mg17 among composite formed phases resulting from powder metallurgy of technology
Pengaruh Penambahan Inhibitor Organik dari Ekstrak Batang Tahongai (Kleinhovia hospita Linn) terhadap Korosi Baja API 5L Triana Yunita; Rizky Yoel; Asih Wentika Putri Kusuma; Sulistijono Sulistijono
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 1 (2019): April
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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This research will study about concentration and immersion time effect of corrosion rate inhibition by using Tahongai (Kleinhovia hospita Linn.) stem extract in a 3.5% NaCl environment. Tests conducted in this research were: the test of Fourier Transform Infrared (FTIR) Spectroscopy to know the functional groups and the compounds contained in the Tahongai (Kleinhovia hospita Linn.) stem and allegedly contains flavonoids from the obtained functional group, Open Circuit Potential (OCP) test to obtain the corrosion data and the lowest corrosion rate which is 6.29x10-4 mm/year obtained on the samples with the addition of 400 ppm 30 day immersion. Efficiency maximum inhibitor obtained on samples with the addition of an inhibitor of 400 ppm 30 day immersion is 88.9336%.
Aplikasi lost wax casting pada pembuatan screw ortopedi : Application of lost wax casting for manufacturing of orthopedic screw Moh Nor Ali Aziz; Rusnaldy; Paryanto; Patrick Munyensanga
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

Orthopedic screws are generally manufactured using CNC machines, but these machines are complex and expensive. Orthopedic screws are included in the special product category from its non-corrosive, not easily distorted and have better accuracy than other screws in general; so, it presents a high selling price. To overcome this challenge; the manufacturing process needs to be analyzed. The lost wax casting process gives production process of screw with accepted measures. This paper discusses the results of the dimensional analysis of casting where the process of casting lost wax begins with making the wax pattern mould. Furthermore, the designed assembly tree is smeared and poured in the ceramic pulp until it hardens. The heating process is useful to dilute the wax pattern before the pouring is successful. The main catalyst for good orthopedic screws is magnesium. The pouring process is needed specifically on this material which is easily oxidized or easily increased if the pouring process is in the open room. To avoid this, the material considered to be used is lead and this process is preferred to develop lost wax casting for manufacturing screws that produce small dimension products with high accuracy.
Analisa Kegagalan Bantalan Bola di Pompa Pelumas Turbin Gas Chevira Destri Pramesthi; 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

Bantalan bola pompa pelumas sebuah turbin gas mengalami kegagalan pada awal operasi. Bola bantalan tidak bisa berputar, terdapat indikasi pemanasan berlebihan pada ring dalam dan luar. Penyebab kegagalan bantalan dianalisa dengan pemeriksaan visual, analisis komposisi kimia, analisis struktur mikro, dan uji keras. Efek pemanasan berlebihan ditunjukkan oleh warna permukaan yang lebih gelap pada ring luar dan dalam akibat gesekan dengan bola. Komponen ring luar dan bola terbuat dari material yang sama yaitu JIS G4805 Grade SUJ1, setara dengan ASTM A485 Grade 1. Struktur mikro ring luar dan bola dari bagian tidak rusak relatif sama, yaitu martensit temper dan partikel karbida. Struktur mikro martensit temper dan partikel karbida pada ring luar dan bola yang mengalami kerusakan parah berubah menjadi bongkahan karbida pada lokasi kontak. Kekerasan komponen bantalan yang tidak rusak diuji untuk menjadi acuan nilai kekerasan awal material. Kekerasan awal bola adalah 435 VHN, ring dalam adalah 249 VHN, dan ring luar adalah 742 VHN. Kekerasan ring dalam jauh lebih rendah dari ring luar akibat pemanasan berulang menggunakan welding torch pada waktu pemasangan dan pelepasan bantalan ke dan dari poros. Temperatur pemanasan diduga mencapai temperatur 650. Kekerasan ring luar yang mengalami kerusakan parah adalah 756 VHN, dan bola yang rusak parah adalah 480 VHN. Kekerasan yang meningkat adalah akibat terbentuknya gumpalan karbida karena ada karbon dari sisa grease yang berdifusi ke dalam ring luar ketika terjadi gesekan antara bola dan ring luar. Penyebab utama kerusakan bantalan bola tersebut adalah keteledoran operator yang tidak menambah grease setelah pemanasan ketika memasang poros ke bantalan. Pemanasan tersebut akan menguapkan grease dan menghilangkan efek lubrikasinya, sehingga bola tidak bisa berputar, dan akhirnya terjadi gesekan relatif antara bola dengan ring dalam dan ring luar. Penyebab ini didukung oleh data temperatur stabilitas grease (sekitar 110), yang mendekati temperatur maksimum pemanasan yang diijinkan oleh pabrik pompa, yaitu 93.

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