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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 6 Documents
 1 
Search results for , issue "Vol. 3, No. 1" : 6 Documents clear
Study on Human Integrity Management System Maturity Level for Supporting Asset Integrity and Process Safety Implementation Sihotang, Anggiat M; Priadi, Dedi; Asral, D. Rizal
Journal of Materials Exploration and Findings Vol. 3, No. 1
Publisher : UI Scholars Hub

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Abstract

The human factors (HF) are recognized as one of critical process safety barriers involved in normal and abnormal conditions in the oil and gas industry. In order to strengthen the HF roles as barriers we need to ensure that the actions generated are based on a valid risk assessment of the operation to be addressed by a relevant human factor analysis. Organizations within the oil and gas process have made much progress in understanding and implementing HF improvement programs. However, organizations are not always clear about what are their current situations in managing HF, their priorities for HF to be improved or where they should focus in their future plans. The objectives of this paper are to develop and propose a model called the human integrity management system (HIMS) model and the way its maturity level (HIMS-ML) is measured in managing HF related to asset integrity (AI) and process safety (PS) implementation. It nowadays becomes something urgent to be implemented but also, importantly, to identify where future efforts and strategy need to be set-up used as basis for improving HF. The proposed HIMS model introduces 5-level scale to determine the level of maturity and includes 20 key elements mainly generated from Bow-Ties model and mapping alignment with the CCPS-risk based inspection process safety (CCPS-RBPS) where 46 expectations are developed to reflect key HF issues within the process safety management system to prevent and mitigate the major accident hazard (MAH) event. This paper describes the model and the method of assessment, illustrating its use with a case study in the 3 big oil and gas operators in Indonesia. Spider chart is used to reflect the results of the maturity assessment obtained based on the response given by the relevant key persons in the organization. It can be concluded that the proposed model appears to be an effective and useful tool to measure the maturity of HF management implementation in AI and PS operation, identify the gaps and propose improvement plans.
Analysis of the Effect of Different Surface Preparation Methods on Corrosion Resistance and Adhesion Strength of ASTM A36 Steel Substrate with Surface Tolerant Epoxy Paint as Coating Material Santoso, Irwan Wijaya; Aqila, Daffa; Riastuti, Rini; Ramadhani, Rizal Tresna
Journal of Materials Exploration and Findings Vol. 3, No. 1
Publisher : UI Scholars Hub

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Abstract

In the industrial world, to extend the service life of materials, protection methods are carried out to slow down the material's corrosion rate. The protection method that is often used is the coating method. The coating method is a protection method by coating the substrate material using a coating material to prevent contact between the substrate material and the environment. In this research, the substrate material used is ASTM A36 steel and the coating material used is Surface Tolerant Epoxy paint. The independent variable used in this study lies in the surface preparation method which consists of: solvent cleaning, hand tool cleaning, power tool cleaning, power tool to bare metal cleaning, and abrasive blast cleaning. Different preparation methods result in different roughness and cleanliness of the surface. This can affect changes in the mechanical properties of the coating material, such as corrosion resistance and adhesion strength. Based on the corrosion resistance test, it is found that the abrasive blast cleaning and power tool to bare metal cleaning methods produce the highest corrosion resistance properties because both have a rating number of 8 in the salt spray test results. Based on the adhesion strength test, it is found that the abrasive blast cleaning method also produces the highest adhesion strength. This conclusion refers to the results of the tape x-cut test where the sample produces a rating number 5A where the sample does not experience peeling after testing. In addition, the abrasive blast cleaning method produced the highest adhesion strength in the pull-off test, which was 7.16 MPa. Thus, the abrasive blast cleaning method is the most effective surface preparation method for ASTM A36 steel before being coated with the coating material. In addition, it can also be concluded that the higher the surface roughness of the sample, the better the corrosion resistance and adhesion strength. Whereas abrasive blast cleaning method have 122.95 µm roughness and 7.16 MPa adhesion strength which is the highest in roughness and adhesion strength.
Fitness for Service (FFS) and Fatigue Assessment for Shell Distorted Steel Storage Tank Based on API 579-1/ASME FFS-1 Herucakra, Wira, Sr. Structure Engineer; Adnyani, Luh Putri; Prasetyo, IC Farid Hadi; Rizkhita, Alviani Rahma
Journal of Materials Exploration and Findings Vol. 3, No. 1
Publisher : UI Scholars Hub

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Abstract

A shell distortion was occurred due to incorrect in the welding procedure during construction of a new built above ground steel storage tank. The assessment level 1 then performed referred to original construction code of API Standard 650 was performed, the roundness data of tank plate was obtained through to laser scanning survey, and the result on assessment level 1 known that the minimum radius of measured point is exceeding the radius tolerance. This unacceptable condition of assessment level 1 requires to be performed the higher level of assessment. A fitness for service assessment level 3 for tank 1000 KL was performed based on API 579-1/ASME FFS-1 Fitness For service Part 8 Assessment of Weld Misalignment and Shell Distortions, The stress analysis procedure is in accordance to on API 579-1/ASME FFS-1 Fitness For service Annex 2D Stress Analysis Overview for FFS Assessment, the load case condition considered under combined static, environmental and seismic loading condition and the acceptance criteria is in accordance with ASME B&PV Code - Section VIII - Division 2, API Standard 650 and ASCE 7.
Development of 485 MPa Class High Strength Low Alloy Steel for Power Plant Infrastructures Baskoro, Agung; Riastuti, Rini
Journal of Materials Exploration and Findings Vol. 3, No. 1
Publisher : UI Scholars Hub

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Abstract

Currently, Indonesia is progressing to build 35,000 MW of power plants, which will increase the demand for materials, especially steel. One of these power plants is fossil fuel-based, which generates not only electricity but also flue gas containing sulfur that may cause corrosion to power plant infrastructure such as chimney or boiler areas. In addition, apart from being resistant to corrosion in sulfuric and hydrochloric acid conditions, the steel used in power plant infrastructure must also have good strength, toughness, and weldability. Therefore, the present paper describes about steel development for power plant applications that has not only corrosion resistance in sulfuric and hydrochloric acid environments but also good mechanical properties through the addition of vanadium as micro alloy element combined with the implementation of a thermo-mechanical controlled process (TMCP) in hot rolling process. The results showed that chemical composition and mechanical properties of the product comply with the standards ASTM A588 Grade A for high strength low alloy steel with atmospheric corrosion resistance. The measured atmospheric corrosion index is 6.54. Thus, the mechanical properties of the steel produced are yield strength of 512-518 MPa, tensile strength of 662-664 MPa, and elongation of 40-42%. The microstructure of the product is ferrite and perlite, with an average grain size of ASTM No. 12.10 (5.2-5.5 µm) classified as very fine grain.
Effects of Ti Addition on the Characteristics of Al-10Zn-6Mg-2Si/ZrO2 Composites Produced by Squeeze Casting Prameshvara, Qesha Diva; Lestari, Pipin Indah; Sofyan, Bondan Tiara
Journal of Materials Exploration and Findings Vol. 3, No. 1
Publisher : UI Scholars Hub

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Abstract

Metal matrix composite (MMC) with 7xxx aluminum matrix is potential for ballistic applications due to the combination of strength, toughness, and light weight. Previous study successfully produced aluminum-based composites with SiC particles which were able to stop type III bullet, however cracks remained on back of the plate. Therefore, in this research, SiC was replaced by zirconia (ZrO2) due to its high fracture toughness. Ti-B grain refiner was added to further improve toughness through grain boundary strengthening mechanism. This research developed 5 vol.% ZrO2 strengthened Al-10Zn-6Mg-2Si composite with addition of Al-5Ti-1B grain refiner produced through squeeze casting process. The Ti content was varied 0, 0.058, 0.073 and 0.0104 wt.%. The composite was solution treated at 450°C for 1 hour, then aged at 200°C for 1 hour. Material characterization Rockwell B hardness testing, impact testing, microstructural observation by using optical microscopy included Scanning Electron Microscope (SEM) with Energy Dispersive X-ray (EDX) and X- ray Mapping. The results showed that addition of Ti resulted in an increase in as-cast hardness as well as aged hardness. This was followed by the decrease in porosities, impact values and Dendrite Arm Spacing (DAS). However, there was an anomaly in the composite containing 0.078 wt. % Ti, due to the fact that this composite was produced by remelting. Actual hardness was lower than theoretical hardness calculated by rule of mixture because ZrO2 particles were not well mixed in the matrix. This was confirmed by the observation of microstructure, SEM and OES, that were not able to detect either ZrO2 or Zr element. The microstructures consisted of Mg2Si in irregular, oval and Chinese script morphologies, aAl8Fe2Si, which was also in Chinese script morphology and bAl5FeSi in needle shape.
Integration of the Ashby Technique and Pahl-Beitz Quantitative Ranking for Railway Axle Material Selection Nafisah, Helya Chafshoh; Fatriansyah, Jaka Fajar; Surip, Siti Norasmah
Journal of Materials Exploration and Findings Vol. 3, No. 1
Publisher : UI Scholars Hub

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Abstract

Railway axle serves as a vital connection between the train's wheels and its body. However, cyclic loading and high speed can induce fatigue in railway axle, which potentially leads to damage human safety. Therefore, it is important to find materials that have good mechanical properties with the lowest weight and cost. In this paper, a comprehensive method using Ashby chart has been performed to select candidate materials of railway axle. The methods begin with analyzing function by determining the problem, objective function, and constraints. After that, the results obtained are ranked using Pahl and Beitz quantitative weighting method. The results showed that the best five candidate materials for railways axle are Ti-6Al-4V, AISI 4130, EA16 carbon steel, bismaleimide matrix CFRP, and 7000 Al, respectively.

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