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All Journal Jurnal Teknik Industri Jurnal Energi Dan Manufaktur Rekayasa Mesin Indonesian Mining Journal Metalurgi Journal of Materials Exploration and Findings Makara Journal of Technology Metalurgi Indonesian Mining Journal Prosiding SNTTM
Bambang Suharno
Departemen Metalurgi Dan Material, Fakultas Teknik, Universitas Indonesia, Depok 16424, Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Hollow Connecting Rod Thin Wall Austempered Ductile Iron (TWADI) for Manufacturing Light Weight Components Silva, Ricardina Freitas da; Suharno, Bambang; Sulamet-Ariobimo, Rianti Dewi
Journal of Materials Exploration and Findings Vol. 3, No. 2
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Efforts made by the automotive industry to reduce energy consumption have encouraged researchers to carry out various studies. One way is to make components lighter by casting thin wall austempered ductile iron (TWADI). Reducing the weight of components such as connecting rods (conrod) will result in lower energy consumption, but provided that these components still meet standards in terms of mechanical properties and microstructure or even exceed them. In this research, design optimization was applied to conrod by making the area I-beam zero mm (hollow), with hope that it can replace conrod Vespa PX-150. While the manufacturing process is divided into several stages. The focus of this research only discusses the design process stage to determine the optimal design with the help of simulation. The difference is found in the number of defects formed. The observations show that shrinkage defects in Model A and Model B are both located at rod big end. Comparison results of the shrinkage defects formed show that in Model A there are 3 shrinkage defects while in Model B there are only 2 defects. From the results obtained, it is recommended to use plates I-Beam in Model B. Based on the results of this simulation, the casting process can be done to validate the simulation results before optimization is carried out in manufacturing of hollow conrod.
Investigation of chessboard scanning strategy in selective laser melting of ti6al4v Amirah Salsabila Widad Putri; Supriadi, Sugeng; Suharno, Bambang
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/j8jemj90

Abstract

Selective Laser Melting (SLM) is recognized as a technology capable of producing metallic components with advantages in geometric flexibility and consistency of mechanical properties. mong the various alloys processed through SLM, titanium alloy Ti6Al4V is particularly attractive due to its superior strength-to-weight ratio, corrosion resistance, and thermal stability. Nevertheless, the quality of as-SLM Ti6Al4V parts is strongly affected by the selection of process parameters. In particular, the laser scanning strategy plays a decisive role in governing energy distribution, thermal gradients, and subsequent microstructural evolution during fabrication. One of the scanning approaches, the chessboard strategy, has gained significant attention because it subdivides the building area into smaller islands that are scanned alternately, reducing scan length and promoting more uniform heat distribution. This study investigates the application of the chessboard strategy in fabricating cylindrical Ti6Al4V specimens, with process maintained constantly. The fabricated geometry exhibited good agreement with the original design, confirming the capability of SLM to reproduce complex features under controlled conditions. Surface characterization revealed protrusions on the top surface (upskin), attributed to excess energy accumulation at the end of scan tracks, while fine wavy-bulgy patterns were observed on the lateral surfaces due to overlapping melt pools and re-solidified particles. The measured average surface roughness (Ra) was 4.275 ± 0.655 µm, falling within an acceptable range for SLM-fabricated components. In addition, scanning electron microscopy (SEM) analysis revealed the presence of lack-of-fusion porosity, indicating localized imperfections in powder melting and consolidation. Overall, the findings highlight that the chessboard scanning strategy not only influences thermal distribution but also directly affects surface morphology and porosity characteristics, providing essential insights for optimizing as-SLM Ti6Al4V.
BENEFISIASI FISIK PADA PASIR KROMIT KADAR RENDAH MENGGUNAKAN MEJA GOYANG DAN DAVIS TUBE Herlina, Ulin; Nurjaman, Fajar; Suharno, Bambang; Mesah, Febriyani; Zulqoernain, Muhammad Syahreyzi Pashey; Al Fahmi, Muhammad Ridwan; Yuhelda; Suseno, Triswan; Bahfie, Fathan; Handoko, Anton Sapto; Zul Hakim, Hafid; Arham, La Ode
Indonesian Mining Journal Vol 28 No 2 (2025): Indonesian Mining Journal, October 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No2.2025.1672

Abstract

The rapid growth of the global steel industry has significantly intensified the demand for the metallurgical-grade chromite ore required for ferrochrome production. This surge has led to a depletion of high-grade chromite reserves, necessitating the utilization of low- and medium-grade chromite to support a stable raw material supply for ferrochrome. This research was conducted to determine the characteristics of the ore and to analyze the effects of physical beneficiation processes using shaking table and Davis tube in enhancing the chromium (Cr) grade and the Cr:Fe ratio of low-grade chromite sand from Morowali, Central Sulawesi. The characterization process was conducted using XRF, XRD, and SEM-EDS. Experimental parameters for the shaking table included variations in table inclination and water flow rate, while magnetic separation was analyzed across various electric current intensities. The optimal shaking table test results were achieved at an inclination of 7.5° with a water flow rate of 18 liters/minute. In contrast, the optimal test using the Davis tube was obtained at an electric current of 0.4 amperes (660 gauss). This integrated process successfully increased Cr grade from 8.5% to 20.77% (corresponding to Cr2O3 30.36%) and improved the Cr:Fe ratio from 0.97 to 1.62, achieving a recovery rate of 94.93%.
BENEFISIASI FISIK PADA PASIR KROMIT KADAR RENDAH MENGGUNAKAN MEJA GOYANG DAN DAVIS TUBE Herlina, Ulin; Nurjaman, Fajar; Suharno, Bambang; Mesah, Febriyani; Zulqoernain, Muhammad Syahreyzi Pashey; Al Fahmi, Muhammad Ridwan; Yuhelda; Suseno, Triswan; Bahfie, Fathan; Handoko, Anton Sapto; Zul Hakim, Hafid; Arham, La Ode
Indonesian Mining Journal Vol 28 No 2 (2025): Indonesian Mining Journal, October 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No2.2025.1672

Abstract

The rapid growth of the global steel industry has significantly intensified the demand for the metallurgical-grade chromite ore required for ferrochrome production. This surge has led to a depletion of high-grade chromite reserves, necessitating the utilization of low- and medium-grade chromite to support a stable raw material supply for ferrochrome. This research was conducted to determine the characteristics of the ore and to analyze the effects of physical beneficiation processes using shaking table and Davis tube in enhancing the chromium (Cr) grade and the Cr:Fe ratio of low-grade chromite sand from Morowali, Central Sulawesi. The characterization process was conducted using XRF, XRD, and SEM-EDS. Experimental parameters for the shaking table included variations in table inclination and water flow rate, while magnetic separation was analyzed across various electric current intensities. The optimal shaking table test results were achieved at an inclination of 7.5° with a water flow rate of 18 liters/minute. In contrast, the optimal test using the Davis tube was obtained at an electric current of 0.4 amperes (660 gauss). This integrated process successfully increased Cr grade from 8.5% to 20.77% (corresponding to Cr2O3 30.36%) and improved the Cr:Fe ratio from 0.97 to 1.62, achieving a recovery rate of 94.93%.
Co-Authors Akhmad Herman Yuwono Al Fahmi, Muhammad Ridwan Amirah Salsabila Widad Putri Andriyah, Lia Anne Zulfia Anton Sapto Handoko, Anton Sapto Arbi Dimyati Arham, La Ode Badrul Munir, Badrul Bahfie, Fathan Bambang Irawan Bustanul Arifin Demas Seto Deni Ferdian Elfi N Fajar Nurjaman Firdiyono Firdiyono Firdiyono, Firdiyono Hanny Hafiar Herlina, Ulin Is Prima Nanda Johny Wahyuadi Soedarsono Kirman Kirman, Kirman Lalasari, Latifa Hanum Latifa Hanum Lalasari Lia Andriyah Luh Putu Ratna Sundari Marsetio, Aldo Fransiskus Marzuki Silalahi Mesah, Febriyani Myrna Ariati, Myrna N, Elfi Nurhayati, Neni Octapiani Pribadi, Pancar Muhammad Pudji Untoro Pudji Untoro Putra, Wahyuaji Narottama Rahyussalim Rahyussalim, Rahyussalim Rianti Dewi Sulamet-Ariobimo, Rianti Dewi Silva, Ricardina Freitas da Sri Harjanto Sri Harjanto Sugeng Supriadi, Sugeng Tito Winnerson Sitanggang, Tito Winnerson Tjokro Prasetyadi, Tjokro Triswan Suseno, Triswan Ulum, Reza Miftahul Vika Rizkia Yuhelda Zul Hakim, Hafid Zulqoernain, Muhammad Syahreyzi Pashey