Deni Ferdian

Deni Ferdian
University of Indonesia | UI · Department of Metallurgic and Material Engineering

Dr.

About

53
Publications
22,232
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
223
Citations
Introduction
Deni Ferdian is a lecturer at Dept. of Metallurgy and Materials Engineering, Universitas Indonesia. He holds degree from Universitas Indonesia (Sarjana Teknik - Bachelor of Engineering) Vrije Universiteit Amsterdam-Netherland (Master of Science) and Institut National Polytechnique de Toulouse (INPT) – France (Doctor, in Material Science). His main research interests in the field of metal solidification especially the intermetallic formation in Aluminum-Silicon alloy. He has taught courses on advanced manufacturing process, kinetics and phase transformation, physical metallurgy and other relevant subjects at all levels.

Publications

Publications (53)
Article
Iron-bearing intermetallic phases formed during solidification of Al–Si casting alloys are known for having detrimental effect on their mechanical properties. This is particularly the case of the β-Al5FeSi phase which precipitates as thin and extended plates. Many researchers already studied the factors that could influence the formation of this ph...
Article
The microstructure of a high-purity Al-6.5Si-1Fe (wt pct) alloy after solidification at various cooling rates was investigated. In most of the cases, the monoclinic beta-Al9Fe2Si2 phase was observed as long and thin lamellae. However, at a very slow cooling rate, Fe-bearing precipitates with Chinese script morphology appeared together with lamellae...
Article
Differential thermal analysis has been used to investigate the effect of cooling rate on rosette formation during solidification of a synthetic Al–Fe–Si alloy. Rosettes can be characterised as a very fine multiphase structure within more or less convex areas dispersed in the matrix. Their formation during solidification is related with liquid entra...
Conference Paper
Full-text available
The microstructure evolution of beta phase during solidification of a synthetic Al6.5Si1Fe (wt.%) alloy has been investigated by in-situ synchrotron micro-tomography and post-mortem tomography. In-situ solidification was observed at a constant cooling rate of 10°C min-1, from above the alloy’s liquidus with the melt at 618°C down to 575°C which is...
Conference Paper
Small rounded pocket with very fine multi-phase structure are quite commonly observed in aluminium alloys. Usually, their appearance is due to small liquid droplets having been entrapped within dendrite arms during primary deposition of (Al) phase. These droplets are sometimes given the name of rosette. In this present work, transmission electron m...
Article
Full-text available
The present work investigates the effectiveness of external corrosion protection using Close Interval Potential Survey (CIPS) and Direct Current Voltage Gradient (DCVG) on a buried gas pipeline. These surveys were performed on 12” gas pipeline in East Kalimantan. Coating and cathodic protection were the primary corrosion protection on these pipelin...
Article
Full-text available
Indonesia has a target of producing 1 million BOPD of oil and 12 BSCFD of natural gas in 2030. The strategy for achieving the production target in 2030 is transformation from resources to production, accelerating chemical EOR, massive connectivity for finding large wells, and optimizing field production. In optimizing existing field production, one...
Article
Full-text available
Solid particles have a higher thermal conductivity compared to a fluid. Therefore, it is a common practice to disperse solid particles inside a base fluid to increase its thermal conductivity. The particle-dispersed fluid is called a thermal fluid. Thermal fluid, such as a coolant, is widely used as a heat transfer fluid. Several types of particles...
Article
Processing nickel laterite conventionally, namely by pyrometallurgy method, requires high temperature and energy, results in a costive process. Due to its lower temperature reduction process, selective reduction with additives could be an alternative in nickel ore processing. Additives such as sulfur/sulfate have a critical role in promoting the lo...
Conference Paper
Indonesia supply accounts for 16 % of the world’s lateritic nickel ore, with the estimation reaching 1.391 billion tons. The process of refining lateritic nickel ore can be considered as one of the main problems faced by the world mining industry, taking into account the economic and energy aspects. This research was carried out to investigate the...
Article
Full-text available
High temperatures in the smelting nickel ore increases the energy costs. The use of sulphur or sulphate as additives can optimize the reduction process at low temperatures through the formation of FeS compound. Biomass waste, which is palm shell charcoal, has potential as a reducing agent in the process of reducing laterite nickel ore because it ha...
Article
Full-text available
This study was conducted to investigate the effect of palm shell charcoal reductant in the selective reduction of nickel ore with the addition of additive at various temperatures and times. In this present work, 10 wt. % of sodium sulfate as additive and 5, 10, 15 wt. % of palm shell charcoal as reductants were used. The reduction of nickel ore was...
Article
Full-text available
Nodular graphite cast iron or known as spheroidal graphite cast iron structurally has a spherical graphite morphology with a matrix consisting of a ferrite-pearlite phase. In general, cast iron has a main alloy consisting of carbon and silicon where both elements have an influence on the potential of graphitization and castability. In this work, th...
Conference Paper
This paper presents a Root Cause Failure analysis for tubing API 5CT Grade J55 leakage on the well conductor. The tubing was installed in oil Well production with gas lift process and found leaked after three years in service. The leakage was reported as multiple leakages after performing an inspection. The investigation has been completed on leake...
Article
Full-text available
The effect of the addition of neodymium rare earth on Al-5Zn-0.5Cu alloy was investigated with Optical Microscope (OM), Differential Scanning Calorimetry (DSC), and Cyclic Polarization. The content variable of neodymium tested was 0.1wt%, 0.3wt%, dan 0.5wt%. Observation with OM was conducted to see the changes of the SDAS and the precipitate format...
Article
Full-text available
Sacrificial anode is one of the most effective methods for preventing corrosion in seawater environment. Aluminum (Al) anode works very well in seawater environment with high electrochemical capacity and high driving voltage. Commonly used aluminum alloy sacrificial anodes have the possibilities to trigger the occurrence of Stress Corrosion Crackin...
Article
Full-text available
A sacrificial anode is a method for material protection in the sea and coastal area. This method is widely applied in marine, subsea and ship structure. Al-Zn-In, a commercial grade of the sacrificial anode had a weakness in the possibility of stress corrosion cracking due to overprotection. This study tried to substitute indium with silicon as the...
Article
Differential thermal analyses of an AlSi6Cu4Fe2 alloy at various cooling rates from the liquid state were performed which showed: i) possible discrepancies in the first solidification steps and; ii) solidification ending with multiple peaks at low cooling rate. Metallographic observation of the samples gave hint for understanding the discrepancies...
Article
Full-text available
The sacrifice of the anode is the cathodic protection used to prevent corrosion. Al-Zn-In alloys are often used it causes excessive protection that can increase the possibility of hydrogen embrittlement in high-strength steel. Therefore, the solution is to use aluminum alloys with low voltage current. The purpose of this research is to know the eff...
Article
Full-text available
Aluminium-Zinc-Silicon alloy is a material candidate for low voltage sacrificial anode. Nevertheless, iron-rich intermetallic phase that formed in the interdendritic region can reduce its efficiency due to the self-corrosion phenomenon. Samarium addition is expected to modify the formation of iron-rich intermetallic phase. The alloying process was...
Article
Full-text available
This paper presents a failure analysis of reducer weld-joint leakage for liquid outlet of slug catcher. The leak point was found on the area of weld joint with position relative to clock position from 9 to 3 o'clock. In order to determine morphology and mechanisms of crack were observed through laboratory tests including chemical composition test,...
Article
Full-text available
In this present work, the selective reduction of nickel laterite was conducted by using 5 to 15 wt. % of sodium carbonate, sodium chloride and sodium sulfate as additives. The 5% wt. of palm shell charcoal was used as the reductant. The selective reduction process for nickel laterite was carried out at 1150°C for 60 minutes followed by wet magnetic...
Article
Full-text available
Development of a low-voltage sacrificial anode for offshore structure has attracted increasing attention in recent years. The low-voltage operation can prevent the structure from overprotection and the resulting stress corrosion cracking. One of the efforts made to create this low-voltage sacrificial anode is by replacing indium as a conventional a...
Article
Aluminium silicon alloys are widely used in automotive industry and other structural application. However, the presence of high content of iron element in Al–Si alloys lead to precipitation of beta intermetallic phase that has a detrimental effect on mechanical properties. Reducing the adverse effects of β-Al9Fe2Si2 precipitates can be achieved by...
Article
Full-text available
Brackets fabrication should be done by a suitable process to produce great result. Processes commonly used are investment casting, machining, and metal injection molding. Investment Casting has a drawback in which the surface roughness is quite high for the standard of brackets and require further processing. Machining is done by removing unwanted...
Conference Paper
Sacrificial Anode Low voltage is the latest generation of the sacrificial anode that can prevent the occurrence of Hydrogen Cracking (HIC) due to overprotection. The Al-5n-0.5Cu alloy showed the potential to be developed as the new sacrificial anode. However, the main problem is copper made Al2Cu intermetallic in grain boundary. Samarium is added t...
Conference Paper
Ferrochrome is an important alloy in stainless steel making due to its contribution to high strength and corrosion resistance. In this present study, ferrochrome was derived from Indonesian chromite sand with low-grade Cr/Fe ratio. In order to improve the ratio, beneficiation process such as pre-magnetic separation and reduction process at 1000°C f...
Article
Full-text available
The effect of coke and bituminous coal on the reduction of medium-grade manganese ore in ferromanganese production was investigated. Charges of 30 kg medium grade manganese ore, 12 kg limestone and varied amounts of coke and coal were smelted in a Submerged Electric Arc Furnace (SAF) at temperatures of 1300°C to 1500°C. The composition of the ferro...
Article
Full-text available
Addition of Ti-B grain refiner in Al-ADC12/nanoSiC composite results in improvement of tensile strength, hardness, and wear resistance through grain refinement. In this research, composite of Al-ADC12/nano SiC (0.15 %vf) with variations of TiB respectively (0.0), (0.02), (0.04), (0.06), dan (0.08) wt% were produced by stir casting. 10% of Mg were a...
Article
Full-text available
The mechanical properties and microstructure of ADC12/nano Al2O3 matrix composites have been studied in this work. The composites were produced by stir casting method. ADC 12 as matrix composites was combined by Mg and Ti. The addition of Ti was varied from 0.02 to 0.08 wt-% as grain refinement wetting to improve mechanical properties such as tensi...
Conference Paper
Full-text available
Surface roughness and microstructure play important role on orthodontic bracket quality. Therefore, orthodontic brackets need to have smooth surface roughness to reduce the friction and bacterial adhesion. Microstructure of orthodontic brackets also determine the mechanical properties and corrosion resistance. There are two methods to produce ortho...
Article
Full-text available
In general, a conventional aluminum anode for seawater service is Aluminum-Zinc-Indium (Al-Zn-In) alloys grade. This type of alloy offers high efficiency and high potential protection in a seawater environment. Nevertheless, there is a limitation for this alloy anode. High protection potential increases the possibility for hydrogen embrittlement in...
Article
Full-text available
In this present work, the ferromanganese was produced by mixing two different grades of Indonesian manganese ore. The possibility of mixing medium-grade manganese ore (27.77 Mn–4.44 Fe–14.7 Si) and low-grade manganese ore (16.39 Mn–19.22 Fe–20.23 Si) to produce ferromanganese was investigated clearly. The 30 Kg of manganese ore mixture was smelting...
Article
Full-text available
Malocclusion is one of the common problems encountered in the teeth and mouth of Indonesian people. This country is also confronted with problems that the bracket have to been imported from abroad. The purpose of this study is to produce national orthodontic bracket by metal injection molding (MIM) process in Indonesia, particularly by using vacuum...
Article
Ferromanganese is one of the most important alloying elements in steel industries. In this work, the production of ferromanganese was carried out using three-phase submerged mini electric arc furnace. The effect of slag basicity due to the addition of a various amount of limestone as fluxing agent on this smelting process was investigated. The chem...
Article
Full-text available
One common method used for corrosion protection is a sacrificial anode. Sacrificial anodes that usually employed in the marine environment are an aluminum alloy sacrificial anode, especially Al-Zn-In. However, the electronegativity of these alloys can cause corrosion overprotection and stress cracking (SCC) on a high-strength steel. Therefore, ther...
Conference Paper
The beneficiation of two different low-grade manganese ores had been done by gravity separation and reduction-roasting process followed by the magnetic separation to improve their Mn/Fe ratio. The effect of particle size and temperature of reduction-roasting in this beneficiation process had been investigated clearly. XRF and XRD analyzer were used...
Conference Paper
Indonesia is known to have a large low-grade manganese ore reserve. Nevertheless, it could not be used optimally in producing ferromanganese due to their low Mn/Fe ratio. In this present study, the beneficiation process had been applied to the low-grade manganese ore. Reduction roasting was conducted to this manganese ore at 700°C for an hour and t...
Conference Paper
Chlorofluorocarbons (CFCs) which emitted to the atmosphere have been recognized to cause damage to the ozone layer. Alternative materials to replace the CFC’s role are those which have properties of the magneto caloric effect (MCE) like Heusler alloys. In this paper, we report results of synthesis studies of the magneto caloric materials based on N...
Conference Paper
Grain refinement is a common practice in aluminium casting alloys, being Ti and/or B the most popular refining additions. The effectiveness of these additions may be controlled by thermal analysis consisting in analysing the cooling curve during solidification of a sample cast in an instrumented standard cup. This assessment is based on the use of...
Article
Full-text available
The modification level of Al-Si alloys is generally evaluated by the depression of the (Al)-Si eutectic temperature which can be recorded by thermal analysis. However, this method requires a reference temperature which should be the eutectic temperature evaluated on the relevant phase diagram. Various methods proposed to account for the effect of l...
Article
Full-text available
The structure of low-carbon steel after hot deformation at 1060 and 960°C with different degrees is studied. A procedure is developed for specimen etching in a reagent based on picric acid making it possible to detect clear austenite grain boundaries and sub-boundaries after hot deformation.
Article
Full-text available
In this present work, an assessment of eutectic modification based on thermal analysis was performed on modified A356 alloy. The effect of various cooling rates which were achieved by means of casting samples with various moduli in sand and metallic moulds was investigated. Cooling curves recorded from thermocouples inserted in the centre of the sa...
Article
Full-text available
The purpose of this research was to study the synthesis of TiO2 nanotubes on Ti-10Ta-10Nb thin film and the effect of applied potential on the tube size, length and morphology. The Ti-10Ta-10Nb thin film was deposited by dc magnetron sputtering on the CP Ti substrate. The anodization of this Ti-10Ta-10Nb thin film was performed in the solution...
Article
The aim of this work is to get the ferrite nucleation criteria from the recrystallized austenite grain after hot deformation in non isothermal condition. A series of rolling experiments have been performed with industrial C-Mn steel in two different temperatures of 1060 and 960 degrees C with sequence cooling cycle. The microstructure changes that...
Article
A fractured flanged thermowell was received for analysis. The fracture was located at the root of “U” insertion/immersion length which was welded to the flange. The failure of flanged thermowell was attributed to the vortex-induced fatigue. The failure was initiated by the weld failure to withstand the fluctuating load resulted from vortex after ye...
Conference Paper
Full-text available
Nanofluids have been developed in a search of new coolants with higher thermal conductivity compared to the conventional coolants, such as water or ethylene glycol. This research is conducted to observe the main characteristics, such as particle size, suspension stability, and thermal conductivity, of nanofluids produced from wet mechanochemical pr...
Article
Full-text available
Intermetallic Cu3Sn Phase Layer on Electrode’s Tip of Galvanized Resistance Spot Welding. A resistance spotwelding method is commonly used in automotive industries application. In a resistance spot welding method, the copperelectrode has a significant role as an electric current carrier for joining thin metal sheet. This research was focused onstud...
Article
A resistance spot welding method is commonly used in automotive industries application. In a resistance spot welding method, the copper electrode has a significant role as an electric current carrier for joining thin metal sheet. This research was focused on studying the effect of tin layer at the electrode tip for joining galvanized steel sheet. T...

Network

Cited By