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All Journal Teknika: Jurnal Sains dan Teknologi Syntax Literate: Jurnal Ilmiah Indonesia Journal of Materials Exploration and Findings Metalurgi
Dhaneswara, Donanta
Department Of Metallurgical And Material Engineering, Universitas Indonesia
Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Social Sciences Other

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The Effect of Sample Placement in the Furnace during the Heat Treatment Process of 7075-T6 Aluminum Alloy on Microstructure, Hardness, and Electrical Conductivity Dhaneswara, Donanta; Rindharto, Hardi; Aqilafif, Muhammad Syauqi
Journal of Materials Exploration and Findings Vol. 1, No. 1
Publisher : UI Scholars Hub

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This paper reports the effects of sample placement during the heat treatment on the microstructural morphology and mechanical properties of 7075 Al alloy such as hardness value and electrical conductivity. The material was in the formed of Al alloy sheets where samples were machined into a square with dimensions of 1.5 x 1.5 inch. The 7075-T0 Al alloy as samples were given heat treatment by precipitation hardening (aging) at temperature 120°C for 24 hours, so it becomes 7075-T6 Al alloy. Samples were subjected to some mechanical tests and the morphology of the resulting microstructures were characterized by optical microscopy. The variable was the placement of samples in the furnace which is based on the differences of the 7075 Al alloy properties, from aging process T0 to T6, in microstructure, hardness value and electrical conductivity even though the tools, materials and treatment given are the same. The study showed that as far as the sample from the furnace door, hardness values were increased while the electrical conductivity decreased and it was proportional to the dispersion of precipitates that occurred.
Investigation of The Effect of Corundum Layer on The Heat Transfer of SiC Slab Fatmi, Sri Elsa; Dhaneswara, Donanta; Anis, Muhammad; Ashari, Ahmad
Journal of Materials Exploration and Findings Vol. 1, No. 2
Publisher : UI Scholars Hub

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Aluminum is the most widely used metal in industry. Aluminum smelting is one of the important steps that needs to be carried out to produce products made of aluminum metal with good quality. In the process of smelting aluminum there are several problems that occur, one of which is the growth of corundum in Si C refractories which affects the quality of aluminum melt and the durability of Si C refractories. This research was conducted to see the heat transfer in Si C and the effect of the presence of Corundum on heat transfer. This research was carried out by simulation using COMSOL Multiphysics to see the distribution of heat and the resulting temperature. The simulation is carried out in two dimensions geometry of a Si C slab and a layer of corundum added. From the simulations carried out for two conditions, namely Si C without corundum and Si C with corundum, it was found that the presence of corundum would inhibit the heat transfer process on Si C Slab.
Freespan Analysis for Subsea Pipeline Integrity Management Strategy Hadi, Nurul; Helmi, Muhammad; Cathaputra, Edo; Priadi, Dedi; Dhaneswara, Donanta
Journal of Materials Exploration and Findings Vol. 1, No. 3
Publisher : UI Scholars Hub

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Abstract. Over a rough seabed or on seabed subject to scour, freespans can occur when contact between a subsea pipeline and the seabed is lost over an acceptable distance. When this exceeds the allowable freespan length, design stresses can be exceeded, and a vortex induced vibration (VIV) response can be initiated, resulting in the risk of fatigue failure. If this is not predicted and controlled properly, it will affect pipeline integrity, leading to expensive rectification and intervention work. Freespan analysis consisted primarily of a screening check in which the as-found freespans from Remotely Operated Vehicle (ROV) or multibeam Side Scan Sonar (SSS) inspection survey were compared against the design allowable lengths and determine the expected fatigue life of a freespan that may be experiencing Vortex Induced Vibration (VIV). Freespans are considered acceptable if the calculated fatigue life exceeds the design life criteria. This paper describes the freespan analysis that has been developed to perform detailed freespan engineering assessments, incorporating the latest survey and as-laid conditions. This analysis follows a methodology in standard code DNVGL RP F105 that has been accepted and used by operators to produce more accurate and less conservative freespan analysis results, leading to a subsea pipeline integrity management strategy with fewer unnecessary interventions and greater cost benefits.
Utilization of Cellulose Symbiotic Culture of Bacteria and Yeast (SCOBY) with Sweet Tea Media as Methylene Blue and Brilliant Green Biosorbent Material Sigiro, Leonard Mateus; Maksum, Ahmad; Dhaneswara, Donanta
Journal of Materials Exploration and Findings Vol. 2, No. 1
Publisher : UI Scholars Hub

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The cellulose from Symbiotic Culture of Bacteria and Yeast (SCOBY) can be used as a biosorbent for dye adsorption, such as Methylene Blue and Brilliant Green. This study used sweet tea with a 6% of sugar concentration and 14 days of fermentation time to synthesize biosorbent material from SCOBY. The results from this synthesis are then characterized using FTIR, SEM, and BET. From the result of characterization, it was found that SCOBY has pores formed from cellulose. The results of the average pore size are 1.5976nm with a pore volume of 0.229cc/g, while the specific surface area is 143.244m2/g. The material that has been characterized is used to absorb the dye using Methylene Blue and Brilliant Green. The mass variation of absorbent is used in this study with variations of 0.5gr, 1gr, and 1.5gr and carried out to absorb the dye for three hours. The highest percentage of dye removal after three hours reached up to 100%, which proved that SCOBY is effective for dye removal.
The Effect of Current Density and Hard Chrome Coating Duration on the Mechanical and Tribological Properties of AISI D2 Steel Hasanah, Indah Uswatun; Priadi, Dedi; Dhaneswara, Donanta
Journal of Materials Exploration and Findings Vol. 2, No. 2
Publisher : UI Scholars Hub

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The effect of hard chromium coating on AISI D2's mechanical properties and wear resistance has been investigated using the electrolysis technique with varying current and coating duration. The variations of current used are 0.8 A, 1.2 A, and 1.6 A, while the coating duration used are 300, 600 and 900 seconds. Characterization of the films was conducted using SEM-EDS, and XRD. It can be observed from SEM characterization that the chrome grains resulted from the electroplating process are fine. The XRD identify chrome compund on the surface coating. The highest hardness value was 520.6 HV on a sample with a current of 1.6 A and a coating duration of 900 seconds and the lowest wear value was 2.85x10-6 mm3/mm on a sample with a current of 1.6 A and a coating duration of 900 seconds.
Combined Risk Based Inspection and Fault Tree Analysis for Repetitive 3-Phase Line Piping Leakage at West Java Offshore Topside Facility Yuliati, Dona; Yuwono, Akhmad Herman; Asral, D. Rizal; Dhaneswara, Donanta
Journal of Materials Exploration and Findings Vol. 2, No. 3
Publisher : UI Scholars Hub

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Hydrocarbon releases might result in serious consequences in various aspects. In addition to the contribution to environmental pollution, repetitive leakages need high repair costs. This study aim is to minimize potential repetitive leakage for other typical 3-phase piping systems. We conducted the risk assessment by adopting Risk Based Inspection (RBI) API 581 to identify risk level, calculating piping lifetime, recommended inspection plan and mitigations. The most relevant root causes can be obtained through quantitative Fault Tree Analysis (FTA). Observation and investigation was taken from eight 3-phase piping systems that experienced repetitive leakages. It has been found that the risk level of some piping systems in yellow and red areas with one pipe in an unfit condition. Next inspection and/or mitigation dates as results of RBI calculation shall be conducted to reduce risk levels and prevent leakage cases. FTA shows the most likely events are the sand problem in fluid, high CO2 content, material deficiency, and high fluid velocity. If the root causes are known earlier, preventive mitigation can be conducted to prevent hydrocarbon release in the other 3-phase piping systems, such as application of internal coating, injection corrosion inhibitor or inspection/monitoring program.
The influence of treatment on cold work tool steel SKD 11 with temperature variations on mechanical properties Hasanah, Indah Uswatun; Priadi, Dedi; Dhaneswara, Donanta; Alhamidi, A. Ali
Jurnal Teknika Vol 19, No 1 (2023): Available Online in June 2023
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v19i1.19422

Abstract

SKD 11 steel is a type of cold work tool steel that is popular and widely used in the manufacturing industry. SKD 11 steel is generally applied as dies, molds, cutting tools or others. Because of these applications. SKD 11 steel must have good wear resistance, hardness, dimensional stability, and toughness. So to improve the characteristics of the steel, a heat treatment process is carried out, but due to the high carbon content and alloying elements in the tool steel, the martensite finish (Mf) temperature of the steel becomes lower, so after the heat treatment process, usually the steel still leaves a lot of austenite phase. or commonly known as residual austenite. Residual austenite can affect the mechanical properties of SKD 11 steel, residual austenite can be removed by carrying out a cryogenic treatment process, this process is carried out after the quenching process. The heat treatment process this time was carried out using a vacuum furnace using an austenite temperature of 1040℃ and quenching using a medium in the form of nitrogen gas with a pressure of 3 bar. The cryogenic treatment process that was carried out afterward was carried out by varying the temperature of -80℃, -110℃, and -140℃. The test results obtained were then analyzed using an optical microscope and XRD (X-ray diffraction), as well as hardness testing and impact testing to determine the mechanical properties of the steel. Based on the research results it is known that the resulting microstructure contains martensite matrix and carbide M7C3 as primary carbide and M23C6 as secondary carbide, then by carrying out the cryogenic treatment process can reduce the percent of residual austenite, the lowest percent of residual austenite is obtained from the results of the cryogenic treatment at -140℃, which is equal to 1.15%. This is directly proportional to the hardness test results obtained, where the highest hardness value was also obtained by the sample with a value of 61.5 HRC, while the relationship with toughness is inversely proportional. The higher the hardness, the lower the resulting toughness. 
Residual Stress Measurement of Used Mining Dump Truck Frame for Remanufacturing Purposes Ferdiyanto, David; Sofyan, Nofrijon; Yuwono, Akhmad Herman; Dhaneswara, Donanta
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.2023.730

Abstract

Remanufacturing the main frame of a mining dump truck can save cost, energy, and materials in heavy equipment industries. It also can reduce CO2 emissions for environmental preservation to achieve sustainability. However, since the mainframe received a dynamic load during operation, it presumably leaves accumulated residual stresses in the frame. The residual stress, particularly tensile residual stress, stands out as a primary contributing factor to the initiation of cracks, which may ultimately result in failures. In this paper, the residual stress of the used mining dump truck main frame was identified by modeling simulation using FEA (finite element analysis) and actual measurement using a portable x-ray residual stress analyzer with the cos α method. The results showed that the weld area subjected to dynamic loads exhibited the highest tensile residual stress, reaching approximately +772 MPa. This specific region emerges as a critical area demanding attention during the remanufacturing process. The application of PWHT (post-weld heat treatment) at 400 °C for 1 hour effectively reduced residual stress on the weld joint, predominantly tensile residual stress, by more than 80%.  
Effect of Heating Temperature and Die Insert Draft Angle on the Flowability of Hot Forged SCM435 Steel Sofyan, Nofrijon; Heruwiyono, Maulana; Yuwono, Akhmad Herman; Dhaneswara, Donanta
Metalurgi Vol 37, No 2 (2022): Metalurgi Vol. 37 No. 2 Agustus 2022
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (806.556 KB) | DOI: 10.14203/metalurgi.v37i2.635

Abstract

The problem of flowability in a closed forging process for heavy equipment industry is still widely found and this may affect the quality of the resulting product. To obtain the solution for this problem, in this work, the effect of heating temperature and die insert draft angle on the characteristic of hot forged SCM435 steel used for undercarriage track roller has been examined. The workpieces were heated at temperature variations of 1150 °C, 1200 °C, 1250 °C and were hot forged at die insert draft angles of 3°, 5°, and 7° to form undercarriage track roller products. The mechanical properties of the products were characterized through hardness and dimension examination, whereas the microstructure was characterized using an optical microscope. The results showed that increasing the heating temperature and die insert draft angle resulted in good flowability. The best result was obtained from the heating temperature of 1250 °C at the die insert draft angle of 7°, with diameter and height of 191.2 mm and 53.6 mm, respectively. This characteristic of the obtained hot-forged product agreed with that of the specified forging design for the undercarriage track roller
Synthesis of Tin Oxide Nanocrystallites with Various Calcination Temperatures Using Co-Precipitation Method with Local Tin Chloride Precursor Panthoko, Norbert Egan Christo; Septiningrum, Fairuz; Yuwono, Akhmad Herman; Nurhidayah, Eka; Maulana, Fakhri Akbar; Sofyan, Nofrijon; Dhaneswara, Donanta; Lalasari, Latifa Hanum; Arini, Tri; Andriyah, Lia; Firdiyono, Florentinus; Ardianto, Yahya Winda; Pawan, Ria Wardhani
Metalurgi Vol 38, No 1 (2023): Metalurgi Vol. 38 No. 1 2023
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (723.013 KB) | DOI: 10.55981/metalurgi.2023.687

Abstract

Indonesia is one of the largest tin metal producers in the world, and one of its derivative products is tin chloride (SnCl4). This material has been used as a raw ingredient for the production of organotin compounds such as methyltin mercaptide for PVC (polyvinyl chloride) plastic industry as a heat stabilizer. On the other hand, this precursor can be used to synthesize SnO2 nanomaterials, which have other strategic potentials, including photocatalysts and solar cell applications. In this study, the synthesis of SnO2 nanocrystallites was carried out using a local tin chloride precursor via the co-precipitation method, followed by a calcination process at temperatures of 300, 400, 500, and 600 °C, for further usage as an ETL (electron transport layer) in a PSC (perovskite solar cell) device. The basic properties characterization was carried out using XRD (X-ray diffraction), ultraviolet-visible (UV-Vis) spectroscopy, and SEM (scanning electron microscopy), while the photocurrent-voltage (I-V) curve photovoltaic performance of the device was performed using a semiconductor parameter analyzer. The characterization results showed that increasing the calcination temperature from 300 to 600 °C increased the average crystallite size from 1.19 to 13.75 nm and decreased the band gap energy from 3.57 to 3.10 eV. The highest PCE (power conversion efficiency) was obtained from the device fabricated with SnO2 nanocrystallites calcined at a temperature of 300 °C, which was 0.0024%. This result was obtained due to the highest transmittance of this sample as compared to others; the higher the transmittance, the better the performance of the ETL, which in turn increased the overall efficiency of the PSC
Co-Authors Ahmad Ashari Ahmad Maksum Akhmad Herman Yuwono Alhamidi, A. Ali Amalia, Ary Yanuar Tri Andika, Geo Surya Andriyah, Lia Aqilafif, Muhammad Syauqi Ardianto, Yahya Winda Asral, D. Rizal Cathaputra, Edo Dedi Supriadi Fatmi, Sri Elsa Fatriansyah, Jaka Fajar Fauzi, Andrian Ferdiyanto, David Florentinus Firdiyono Hanifa, Muthia Hartoyo, Fernanda Hasanah, Indah Uswatun Heruwiyono, Maulana Indah Uswatun Hasanah Islam, Adinda Izzatul Lalasari, Latifa Hanum Maulana, Fakhri Akbar Muhammad Anis, Muhammad Muhammad Helmi Munthe, Aditya Pahlawan Nofrijon Sofyan, Nofrijon Nurhidayah, Eka Nurul Hadi, Nurul Panthoko, Norbert Egan Christo Pawan, Ria Wardhani Pradana, Agrin Febrian Priadi, Dedi Putra, Wahyuaji Narottama Rindharto, Hardi Septiningrum, Fairuz Shahab, Ahmad Nabil Sigiro, Leonard Mateus Tri Arini, Tri Wardana, Afif Widyaputra, Gama Yahya, Ilham Nur Dimas Yuliati, Dona