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All Journal Jurnal Sains Materi Indonesia Mesin Jurnal Metalurgi dan Material Indonesia Jurnal Teknologi Bahan dan Barang Teknik Metalurgi Jurnal Polimesin
Setiawan, Asep Ridwan
Teknik Material, Fakultas Teknik Mesin Dan Dirgantara, Institut Teknologi Bandung
Automotive Engineering Chemistry Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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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)

Show Abstract | Download Original | Original Source | Check in Google Scholar

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.
ANALYSIS OF MICROSTRUCTURE AND HARDNESS OF WELDED JOINTS OF DISSIMILAR STEEL OF AISI 1018 - AISI 304 Gilang Gumilar; Imin Abdulah; Rochim Suratman; Asep Ridwan Setiawan
Jurnal Sains Materi Indonesia Vol 20, No 4: JULY 2019
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jsmi.2019.20.4.5280

Abstract

This research studies the microstructure and hardness property of shield metal arc welding (SMAW) from dissimilar metals between austenitic stainless steel (SS) AISI 304 and low carbon steel (LCS) AISI 1018 using E308 filler metal. The procedure used was LCS-to-LCS welding carried out without post weld heat treatment (PWHT) and SS-to-SS welding followed by PWHT at a temperature of 1000ÚC and holding time for 12 minutes. Then, it was followed by shock cooling in aqueous media. The difference in PWHT stages in the two procedures is expected to affect the microstructure and hardness of the welding results. This was conducted to find out more precise procedures in the SMAW technique for welding dissimilar metals like AISI 304 with AISI 1018 so that the risk of chromium carbide precipitate formation and the low hardness of welded joints can be reduced. The results showed there were chromium carbide precipitates in the heat-affected zone (HAZ) of AISI 304, grain enlargement in the HAZ area of both steels, as well as the formation of the ferrite delta phase in the welding area by LCS-to-LCS welding. While the value of hardness in the HAZ area of AISI 304 has decreased, increases occur in the HAZ area of AISI 1018 in all welding conditions. In addition, PWHT treatment can increase the hardness on the AISI 1018 side due to the formation of the martensite phase, decrease in the hardness value on the AISI 304 side, and the reduced ferrite delta phase and the number of chromium carbide precipitates.
Pengaruh Konsentrasi Thinner terhadap Ketahanan Korosi Lapisan Epoksi pada Baja Karbon Rendah Asep Ridwan Setiawan; Egi Setiawan
Jurnal Teknologi Bahan dan Barang Teknik Vol 8, No 2 (2018)
Publisher : Balai Besar Bahan dan Barang Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (432.982 KB) | DOI: 10.37209/jtbbt.v8i2.117

Abstract

Epoxy coating is frequently used to protect steel substrate from corrosion.  However, it was found that the epoxy coated steel was also very often attacked by corrosion. Insufficient coating procedure, substrate preparation, selection of coating composition and mechanical damage are several factors which might contribute to the epoxy coating failure. In this work, the effect of thinner concentration on epoxy coating resistance to corrosion was studied. Epoxy coating was applied onto carbon steel substrate using conventional spray method. The concentration of thinner used for this study were 0; 15 and 30% volume. The thickness, surface roughness, hardness and permeability of epoxy coating were evaluated. The corrosion resistance of epoxy coating was evaluated in 5% NaCl solution using salt spray test. The epoxy coating with addition of 15% thinner had the highest adhesiveness, i.e 1.875 MPa. Salt spray test indicated that the epoxy coating with the addition of 15% thinner had very good underfilm corrosion resistance, with Xmax 0.64 mm, and Ymax 0.69 mm. Moreover, the increase of thinner concentration in epoxy coating decrease the thickness and surface roughness of epoxy coating formed. FTIR result showed that the addition of thinner onto epoxy coating did not modify the epoxy chemical structures.Lapisan epoksi sering digunakan untuk melindungi baja karbon dari korosi. Namun baja yang diberi lapisan epoksi dapat terserang korosi. Prosedur pelapisan yang kurang baik, preparasi permukaan, pemilihan komposisi lapisan dan kerusakan mekanis adalah beberapa faktor yang dapat menyebabkan rusaknya lapisan epoksi pada baja. Pada penelitian ini akan dipelajari pengaruh konsentrasi thinner terhadap ketahanan korosi lapisan epoksi. Lapisan epoksi dengan konsentrasi thinner yang bervariasi diaplikasikan pada substrat baja menggunakan metoda spray. Konsentrasi thinner yang divariasikan adalah 0, 15 dan 30 % volume. Pengukuran ketebalan, kekasaran, kekerasan dan permeabilitas pelapisan dilakukan sebagai data pendukung. Ketahanan korosi lapisan ini diuji pada lingkungan NaCl 5% dengan pengujian korosi siklus kabut garam. Hasil pengujian menunjukkan bahwa sampel dengan konsentrasi thinner 15% memiliki nilai daya lekat paling tinggi yaitu 1,875 MPa. Pengujian korosi siklus kabut garam menunjukkan bahwa lapisan epoksi dengan 15% thinner memiliki ketahanan korosi underfilm yang sangat baik, dengan Xmax 0,64 mm dan Ymax 0,69 mm. Seiring dengan peningkatan konsentrasi thinner, ketebalan dan kekasaran permukaan lapisan menurun. Hasil pengujian FTIR menunjukkan bahwa penambahan thinner tidak mempengaruhi struktur kimia dari lapisan epoksi yang terbentuk.
Pengaruh variasi tool speed dan traveling speed pada friction stir welding Al 2017 dan Al 7075 Ely Aprilia; Audi Prasetya Bagdja; Asep Ridwan Setiawan
Jurnal POLIMESIN Vol 19, No 1 (2021): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v19i1.2040

Abstract

AbstrakFriction Stir Welding (FSW) merupakan proses penyambungan logam dalam kondisi solid state atau kondisi logam yang tidak meleleh. Satu keunggulan dari proses penyambungan menggunakan FSW adalah tidak banyak mengubah sifat logam induknya karena panas yang dihasilkan tidak besar. FSW memiliki potensi untuk menyambung alumunium sejenis dan beda jenis dengan hasil lasan yang memiliki sifat fisik dan mekanik baik. Penyambungan alumunium menggunakan metoda las konvensional memerlukan perlakuan khusus karena terdapat lapisan alumunium oksida, yang memiliki titik cair yang sangat tinggi, pada permukaannya. Tujuan dari penelitian ini untuk menganalisis pengaruh kecepatan putaran tool dan kecepatan translasi terhadap karakteristik hasil lasan yang dihasilkan dari metode FSW pada penyambungan logam beda jenis alumunium 2017-T4 dengan alumunium 7075-T6. Variasi yang digunakan adalah kecepatan putaran tool 1250 rpm, 1000 rpm, dan 800 rpm, dengan variasi kecepatan translasi yang digunakan adalah 100 mm/menit, dan 80 mm/menit. Hasil penelitian menunjukkan bahwa terjadinya perbedaan ukuran butiran dan kekerasan pada tiap daerahnya. Daerah yang terpengaruh oleh panas (HAZ) memiliki kekerasan yang paling rendah diantara zona-zona yang lainnya yaitu memiliki nilai kekerasan HAZ Al 7075 sebesar 94,13 HV0,2 dan Al 2017 sebesar 88,76 HV0,2. Kekerasan paling tinggi terdapat pada sampel B3 (1250 rpm 80 mm/menit) pada daerah yang diaduk (Stir Zone) yaitu  131 HV0,2. Adapun nilai kekuatan tarik yang dihasilkan paling maksimum yaitu pada sampel B3 (1250 rpm 80 mm/menit) yaitu sebesar142,08 N/mm2.AbstractFriction Stir Welding (FSW) is a process of metal joining in solid state or the condition of metals that do not melt therefore the base metal properties do not change. Friction Stir Welding (FSW) is potential method to joining similar or dissimilar aluminum with weld results that have good mechanical properties. In conventional welding methods, joining aluminum with similar or dissimilar aluminum need special treatment on the surface and choosing the correct parameters. The purpose of this study was to analyze the effect of Tool Rotation Speed and travelling speed on the weld characteristics that produced by the Friction Stir Welding (FSW) method in joining dissimilar aluminum 2017-T4 with aluminum 7075-T6. The variations used are tool rotation speed of 1250 rpm, 1000 rpm, and 800 rpm, and the travelling speed used is 100 mm/min, and 80 mm/min. The results showed that there are differences in grain size and hardness in each area. Heat affected zone (HAZ) had the lowest hardness among other zones. Hardness value of HAZ Al 7075 and Al 2017 are 94.13 HV0.2 and  88.76 HV0.2, respectively. The highest hardness was found in the B3 sample (1250 rpm 80 mm/min) in the stirred area (Stir Zone) which was 139.8 HV0.2. The maximum value of tensile strength produced in the B3 sample (1250 rpm 80 mm/min) is 142.08 N/mm2.
The Effect of AlTi5B1 and ALTAB Ti80 with a Combination of AlSr15 and Mg Additions on Strength and Ductility of A356 Aluminum Alloys Mostavan, Afghany; Setiawan, Asep Ridwan; Basuki, Arif; Ardy, Husaini
Metalurgi Vol 38, No 3 (2023): Metalurgi Vol. 38 No. 3 2023
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/metalurgi.2023.714

Abstract

The current study aims to analyze microstructural changes affecting the A356 aluminum alloy, a hypoeutectic Al-Si-Mg alloy. This aluminum alloy is well-known for its strength, resistance to corrosion, lightweight, and heat treatability. The main objective of this research is to improve the strength and ductility of A356 alloys by using a synergistic strategy that includes AlTi5B1 and ALTAB Ti80 for microstructural alteration in combination with AlSr15 and Mg. The experimental results show that including all constituents in the as-cast condition enhances the ultimate tensile strength and elongation. Furthermore, in the heat-treated state, the addition of ALTAB Ti80 effectively maintains tensile strength (σuts=233.7 MPa), yield strength (σy=180.3 MPa), and elongation (e=5.8%). Additionally, when combined with Mg, the tensile strength and yield strength exhibit further improvement (σuts=253 MPa and σy=215.7 MPa); however, elongation is significantly reduced (e=2.7%)
ENHANCED IONIC CONDUCTIVITY OF LAYERED-MNO2 ACCOMPANIED MORPHOLOGY EVOLUTION FOR AQUEOUS ZINC-ION BATTERY Afiefudin, Mohamad; Setiawan, Asep Ridwan
Mesin Vol 30 No 1 (2024)
Publisher : Faculty of Mechanical and Aerospace Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/MESIN.2024.30.1.4

Abstract

Enhancing ionic conductivity is crucial for improving the performance of cathode materials in zinc-ion battery applications. In this study, nanoscale manipulation with nickel intercalation into the layered-MnO2 cathode structure was achieved through a hydrothermal reaction at 160°C for 10 hours. The results of Ni-layered-MnO2 synthesis showed a distinctive peak of layered-MnO2 cathode, as indicated by XRD results, and increased conductivity; its ionic conductivity was analyzed through electrochemical impedance spectroscopy (EIS), enabling rapid diffusion of Zn2+ ions and electron transfer. The distinctive morphology and structure of Ni-doped layered-MnO2 through scanning electron microscope (SEM) contribute to enhanced ionic conductivity and facilitate ion transportation, positioning it as a promising cathode material for aqueous zinc-ion battery applications.
Co-Authors Afiefudin, Mohamad Akhmad Zein Eko Mustofa Ardy, Husaini Audi Prasetya Bagdja Egi Setiawan Ely Aprilia Gilang Gumilar Imin Abdulah Mostavan, Afghany Ramelan, Aditianto Riska Rachmantyo Rochim Suratman Rony, Zahara Tussoleha