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Journal of Materials Exploration and Findings
Published by Universitas Indonesia
ISSN : -     EISSN : 29625475     DOI : https://doi.org/10.7454/jmef
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JMEF publishes publications that report on R&D discoveries and fundamental understanding of phenomena with potential significance, as well as those that explore solutions to current engineering challenges in materials and mechanical engineering or related fields. JMEF includes original research, review and short communication articles. JMEF welcomes original articles on all aspects of materials science/engineering and mechanical engineering, including: 1. Materials synthesis, processing and manufacturing; 2. Advanced Materials; 3. Extraction metallurgy; 4. Physics of Materials; 5. Computational studies on Materials and Mechanical Engineering; 6. Fluid Dynamics and Heat Transfer; 7. Management Integrity and Reliability Engineering; 8. Mechanical systems; and related fields.
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Articles 5 Documents
 1 
Search results for , issue "Vol. 2, No. 2" : 5 Documents clear
Effect of Heat Input on Microstructure and Mechanical Properties of Submerged Arc Welded SM570-TMC Steel Yuhandri, Toni; Winarto, Winarto; Natalia, Diana
Journal of Materials Exploration and Findings Vol. 2, No. 2
Publisher : UI Scholars Hub

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Abstract

SM570TMC is high-strength steel (HSS), which is commonly used in structures that require higher-strength components. In this research, submerged arc welding (SAW)-welded SM570 TMC steels' microstructure and mechanical characteristics were examined. SM570 plates with 12mm thickness were multi-pass welded by using a 3.0 mm diameter of ESAB OK Autrod 13.40 (AWS A5.23: EG) filler metal. The joint design is a single V multi-pass butt weld with a backing strip. Two welded joints were prepared by using heat inputs of 2.2 and 2.9 kJ/mm. The microstructures of two welded joints were observed by using optical microscopy and scanning electron microscope (SEM). Hardness tests were performed in the weld metal, heat-affected zone, and base metal. The mechanical properties of welded joints were assessed using the tensile test and Charpy V notch impact test in HAZ and weld metal areas. The result showed that the strength of joints is satisfactory with no fracture in weld metal while the impact energy of weld metal and HAZ is acceptable for lower temperature application.
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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Abstract

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.
Local Chlorhexidine Delivery for Periodontal Infection Therapy: A Short Review Najmudin, Muhammad Guruh; Pangesty, Azizah Intan; Riastuti, Rini; Sunarso, Sunarso; Abdullah, Abdul Halim
Journal of Materials Exploration and Findings Vol. 2, No. 2
Publisher : UI Scholars Hub

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Abstract

Oral diseases affected more than half of the world’s population. Periodontitis is the second biggest threat to oral health after dental caries. Periodontitis is an inflammation inside periodontal pockets caused by pathogenic microbial colonies which lead to destruction of bone tissue and soft tissue. Chlorhexidine gluconate is an antimicrobial agent that effective to destroy pathogenic microbial and cure periodontitis. Chlorhexidine gluconate is given locally using a carrier material to the infected area. There are several materials that can be used to deliver Chlorhexidine gluconate to the infected periodontal tissue such as gel, liquid (mouthwash), and chip. This short review aims to describe the current methods to deliver Chlorhexidine gluconate to the infected periodontal tissue, including the advantages, disadvantages, and the future trend of the carrier materials used for periodontitis treatment. Future research about materials that can help to optimize tissue restorative after cure periodontitis would be beneficial.
Optimization of AlTi PLD coating by increasing Ti content, N2 and Annealing which used for SKD61 pins in aluminum die casting Kosasih, Rusman; Suliyanti, Maria Margaretha, Prof; Priadi, Dedi; Usni, Wisnu
Journal of Materials Exploration and Findings Vol. 2, No. 2
Publisher : UI Scholars Hub

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Abstract

The Alumunium Titanium Nitrogen (AlTiN) coating is known as one of the best coating materials for protective coating, while Pulsed Laser Deposition (PLD) is a laser coating process used for electric layer and superconductor applications, producing thin films up to 20 µm in thickness. The combination of these two matters has already been researched and is still in progress. One major challenge in the aluminium casting industry is to minimize the damage caused to tool steel pins made from SKD61, when aluminium material sticks to the pin, and halting production. Therefore, research on effective coatings for tool steels and testing various basic mechanical properties, such as hardness, coating content, roughness, adhesive level, surface image, and microstructure, need to be conducted to address this issue. The research started by creating dummy blocks as samples from SKD61, followed by PVD-PLD with three coating materials, namely Al/Ti (50:50), Al/Ti (40:60), and Al/Ti (30:70). The PLD utilized an Nd:YAG laser with a 1064 nm wavelength, and a vacuum condition with 99.5% High Purity N2 gas, concluding with the annealing process. Several sample tests were conducted to assess the effectiveness of the coatings, including FESEM, SEM, EDS, surface roughness, VDI, and micro-hardness, which were analyzed at the BRIN Physics Research Center and PT XYZ Laboratory. The results indicated that the thin layer deposition improved mechanical properties. The coatings showed an amorphous Al-Ti-N morphology, with surface hardness ranging from 333-384 mHv (without annealing) and 410-455 mHv (with annealing). The roughness increased from 0.198-0.247 Rz (without annealing) to 0.318-0.916 Rz (with annealing). The coatings were ranked in ascending order of hardness as AlTi 40:60, AlTi 50:50, and AlTi 30:70. These findings provide valuable insights for further research, including exploring substrate heat treatment, fixture rotation, and casting effects.
The Effect of Heat Treatment and Chemical Treatment on Natural Fibre to The Durability of Wood Plastic Composites – A Review Nasharudin, Nuratiqah Asyiqin Mohd; Sulaiman, Nur Fatihah; Mohammad, Nurul Aziemah; WAN JAAFAR, WAN NOR RAIHAN; Abu, Falah, Dr.; Surip, Siti Norasmah
Journal of Materials Exploration and Findings Vol. 2, No. 2
Publisher : UI Scholars Hub

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Abstract

The application of WPC is not only limited to indoor applications but has been extended to exterior applications where properties of WPC could compromise during service life. WPC was derived from wood fiber of various sizes to reinforce polymers. Wood fiber has the advantage of a cheaper price, being abundantly available, and ease of processing, however, the critical factor is its hydrophilic nature, where moisture absorption is likely to occur. Thus, treatments for reducing the hydrophilicity of wood fibers are applied. By treatment of wood fiber, the surface impurities were removed, leaving the roughened surface of fibers, thus providing a good surface for fiber-matrix interaction. The purpose of this study is to systematically review the effect of heat treatment and chemical treatment on wood fiber on the durability of WPC. The literature cited was searched in Scopus with related keywords – leading to 4292 articles. Article search was then limited from 2012 to 2021 and led to 443 articles to identify and analyze focusing on the durability of WPC. After fine-tuning, only 30 articles were considered to answer the research question in this study. The finding reveals that the treatment of wood fiber has a significant effect on the durability of WPC. Heat and chemical treatment were observed to improve the interfacial adhesion and resistance to fungal attack and the mechanical and physical properties of WPCs.

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