Wahyuaji Narottama Putra

Wahyuaji Narottama Putra
University of Indonesia | UI · Department of Metallurgic and Material Engineering

About

36
Publications
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334
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Introduction
Wahyuaji Narottama Putra joined as a lecturer in Department of Metallurgy & Materials Engineering Universitas Indonesia since 2012. His main areas of expertise are on Heat Treatment and Surface Engineering especially for Ferrous based materials, and Microstructure Analysis (Metallography). Current Projects: Advanced cooling medium by nano-particle addition. Gallium-based particle synthesis for nano-fluids

Publications

Publications (36)
Article
Full-text available
The presence of retained austenite in the hardening process of tool steel often causes the lower hardness compared to the hardness requirements and poor dimensional stability in the tool steel. The purpose of the present research is to determine the relationships between the tempering process with and without cryogenic treatment to the hardness and...
Article
Full-text available
Aluminium with a composition of 7-10% Silicon (Si), 2-4% Copper (Cu) is a matrix used by adding Nano SiC reinforcement particles with variations of 0.25; 0.3; 0.4 %Vf with the purpose of making bullet-proof materials that have high toughness, impact resistance, and good strength. In this study, fabricated composites used a stir casting process to p...
Article
Full-text available
Gallium-based liquid metals have been used widely in many industries because of their unique properties such as high electrical conductivity, the superconductive character at low temperature, and high thermal conductivity. For heat management application, Gallium based metal can be used directly in the liquid form, or in solid particle form. The so...
Article
Full-text available
Quenching process is the most important step in steel heat treatment as this process will determine the properties of the steel such as strength and hardness. Different cooling rate and thermal conductivity provided by the quench medium affect strongly to the mentioned steel properties. Recently, studies for nanoparticle added in the quench medium...
Article
Full-text available
Quenching is performed as part of steel heat-treatment to enhance mechanical properties, by rapid cooling. Factors that affect the selection of quench medium are hardenability of material, geometry, and dimensions of the component. In recent developments, nanofluids are used to improve heat transfer capacity. In this research, nanofluids were synth...
Article
Full-text available
The mechanical properties of a material depend on the quenching process. In this process, there is a rapid cooling from elevated to room temperature in a short time by using a quench medium. Therefore, the phase transformation from austenite to martensite occurs. The common medium used in the quenching process is water, oil, polymer, and gas. Nanof...
Article
Full-text available
Heat treatment of material particularly quenching requires a high thermal conductivity quench medium. Hardenability of material, dimension, and geometry of the component are considerate on choosing quench medium. The cooling rate of quenching affects the properties and microstructures by creating specific phase transformation to occur. Enhancing th...
Article
Demand for materials with excellent mechanical properties and lightweight increase in a recent year especially for high-performance applications. Aluminum reinforced Al2O3 composite (AMC) provide this superior property. Therefore in this research, aluminum alloy 6061 was used as a matrix and Al2O3 with 10 and 15 Vf-% as a reinforced for making meta...
Article
Full-text available
Recently, nanofluid is used to improve the thermal conductivity of the quench medium in the heat treatment industry. In this research, ball-milled micro-sized TiO 2 powder and nano-sized TiO 2 particle were used and compared for their cooling characteristic in a micro/nanofluid. The micro/nanofluids were produced by mixing 0.1%, 0.3%, and 0.5% volu...
Article
Full-text available
Quenching takes an important part in the heat treatment process that controls the microstructure, thus enhance its mechanical properties. The heat treatment process starts with heating at an elevated temperature, holding time then rapid cooling to room temperature. It requires a medium with a good thermal conductivity that can be achieved by the ad...
Article
Pack thermo-reactive deposition (TRD) process has been carried out on SUJ2 (AISI 52100) steel substrate, with different wt.% ratio of FeCr/FeV coating powder. In general, TRD process is able to produce several types of hard layer, e.g. carbide, nitride, or carbonitride layer to improve steel surface hardness and wear resistance. In this work, the F...
Article
Full-text available
A study of ADC12 (Al-Si aluminium alloy) composite is conducted to obtain a more sustainable material with enhanced properties for automotive industry purpose, such as train's brake shoe and bearing application. For those kind of utilization, material with durability, good elastic modulus, thermal stability, wear resistance, and high strength prope...
Article
Full-text available
In this research, the formation of carbide layer coating on SUJ2 steel by pack Thermal Reactive Deposition method was studied. Mixture of 35/65 weight percent of ferrochromium/ferrovanadium (FeCr/FeV) powder was applied as coating elements. The process was carried out at temperatures of 900, 950, and 1000 °C for 6 hours for each temperature. The ef...
Article
Full-text available
Tube boiler operating condition initiates common problems that can occur as a problem in the wear resistance material. It leads to a decreased function of the material so that it is necessary to repair or replacement. High Velocity Oxygen Fuel (HVOF) is regarded as one of the effective methods to increase the wear resistance of the material. In thi...
Article
Full-text available
AISI D2 tool steel has become important material in the industry, especially for mold and dies maker and also used for cutting tools. Conventional hardening process such as annealing and quenching is normally done for this kind of steel as it needs high hardness and wear resistance properties. To further improve its performance, sub-zero treatment...
Conference Paper
Recently, nanofluids have been widely used in heat treatment industries as quench medium with better quenching performance. The thermal conductivity of nanofluids is higher compared to conventional quench medium such as polymer, water, brine, and petroleum-based oil. This characteristic can be achieved by mixing high thermal conductivity particles...
Conference Paper
This paper presents developments contributing to the improvement of thermo-reactive deposition (TRD) process in producing hard carbide layers, on automotive components application. The problem in using FeV powder as a coating material that has been applied in the industries is it is high cost. In this study, FeCr powder coating material was mixed i...
Article
Full-text available
Quenching has been a valuable method in steel hardening method especially in industrial scale. The hardenability of the metal alloys, the thickness of the component, and the geometry is some factors that can affect the choice of quench medium. Improper quench media can cause the material to become too brittle, suffers some geometric distortion, and...
Article
Full-text available
The choice of quench medium depends on the hardenability of the metal alloy, the thickness of the component, and the geometry of the component. Some of these will determine the cooling rate required to obtain the desired microstructure and material properties. Improper quench media will cause the material to become brittle, suffers from geometric d...
Article
Full-text available
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 c...
Article
Polyethylene (PE) and Polypropylene (PP) are already well-known as a type of packaging materials and resulting on abundant amount of wastes. On the other hand, fabrication of papers always has lignin as one of the by-products. These materials are potential to be combined with asphalt to create asphalt composite which will have better mechanical pro...
Article
Full-text available
As deep earth oil exploration transits into deeper earth, it faces challenges in producing reliable microelectronics devices and sensors that will not degrade at high temperature, especially those related to packaging materials and assembly of the devices. It has been reported that the mechanical performance of a high temperature Au-Ge eutectic sol...
Article
Full-text available
The through-silicon via (TSV) approach is essential for 3-D integrated circuit (3-DIC) packaging technology. TSV fabrication process, however, is still facing several challenges. One of the widely known challenges is via protrusion. Annealing a TSV wafer puts the copper (Cu) TSVs under high stress and may form a protrusion where the Cu is forced ou...
Conference Paper
Copper Through-Silicon Via (Cu TSV) is becoming a key technology for three dimensional (3D) packaging and 3D integrated circuit (IC) applications. The microstructure of the Cu TSV is important as it not only affects the electrical properties, but ma y play a role in its reliability such as protrusion. In this study, physical vapor deposition (PVD)...
Conference Paper
As deep earth oil exploration transits into deeper earth, it faces challenges in producing reliable microelectronics devices and sensors that will not degrade under a higher temperature and pressure environment. Numerous physical issues limit the manufacturing of this type of reliable microelectronics devices, especially those related to packaging...
Article
Full-text available
Three-dimensional (3D) integrated circuit (IC) technologies are receiving increasing attention due to their capability to enhance microchip function and performance. While current efforts are focused on the 3D process development, adequate reliability of copper (Cu) through-silicon vias (TSVs) is essential for commercial high-volume manufacturing....
Conference Paper
Full-text available
Three-dimensional integrated circuit (3DIC) technologies are receiving attention due to several advantages such as multi-function, low form factor and high performance microchip. Through-silicon via (TSV) approach is essential for 3DIC packaging technology. TSV fabrication process, however, is still facing several challenges. One of the widely-know...

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