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Journal Mechanical Engineering
Published by Politeknik Negeri Ambon
ISSN : -     EISSN : 29884977     DOI : https://doi.org/10.31959
Core Subject : Engineering,
Industrial & Manufacturing Engineering Mechanical Engineering
Manufaktur, Perawatan, Otomotif, Teknik Produksi Migas dan Teknologi Rekayasa Sistem Mekanikal Migas
Arjuna Subject : Teknik (semua kategori) - Mekanik Material
Articles 113 Documents
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PENGARUH VARIASI CAMPURAN BIODIESEL MINYAK JELANTAH TERHADAP KARAKTERISTIK PEMBAKARAN PADA MESIN DIESEL Berthy Pelasula; R.R Lekatompessy; NJM Nanulaitta; Graciadiana I Huka; Hendry de Fretes
Journal Mechanical Engineering Vol. 3 No. 3 (2025): DESEMBER
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v3i3.3867

Abstract

This study investigates the transient behavior of internal combustion engines (SI Engine) using various ethanol-gasoline blends (E0 to E10). The research aims to analyze the impact of bioethanol concentration on engine stability across two operational regimes: low speed (1500 RPM) simulating idle conditions and medium speed (2000 RPM) representing transition to workload. The experimental method involved sequential microscopic recording of crankshaft fluctuations at specific intervals. The results demonstrate that at 1500 RPM, E10 significantly improves operational stability, reducing fluctuations to only 10 RPM compared to 60 RPM for E0, due to the oxygenated nature of ethanol. Conversely, at 2000 RPM, higher ethanol concentrations (E8 and E10) lead to performance deficits and unstable combustion phases. This is attributed to the lower heating value (LHV) of ethanol, which results in a 3% to 4% reduction in chemical energy input, and high latent heat of vaporization that causes intake cooling and non-uniform vaporization.  Key word : bioethanol, SI engine, engine stability, fluctuations RPM
Optimalisasi Kekerasan Baja ST-42 Melalui Karburasi Ramah Lingkungan Berbasis Biokarbonat Cangkang Kepiting dan Modulasi Suhu Tempering Semuel M.J.S Tuny; H. S. Latumaerissa; Erwin B Pattikayhatu; Nevada Nanulaitta; Graciadiana I Huka
Journal Mechanical Engineering Vol. 3 No. 3 (2025): DESEMBER
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v3i3.3871

Abstract

ST-42 low-carbon steel inherently possesses limitations in its surface mechanical properties, particularly regarding hardness and wear resistance. This study aims to enhance the material's functionality through pack carburizing and tempering heat treatments, utilizing the innovation of crab shell waste which is rich in Calcium Carbonate (CaCO3) as a biogenic catalyst to replace the toxic synthetic Barium Carbonate (BaCO3). The carburizing process utilized a mixture of walnut shell charcoal and 30% crab shell powder, followed by rapid quenching in SAE 20-50 oil, and subsequent tempering at varying temperatures from 200°C to 600°C. Hardness was evaluated using the Rockwell (HRC) method. The results demonstrated that the integration of the crab shell catalyst accelerated the Boudouard reaction via massive CO2 emissions, significantly increasing the surface hardness by 22.80% to an average of 138.34, compared to a mere 10.49% increase achieved without a catalyst. During the tempering phase, heating within the 200°C – 400°C range resulted in a marginal hardness decrease due to the formation of fine carbide particles that maintained wear resistance while relaxing residual stresses. Conversely, extreme heating at temperatures between 500°C – 600°C caused a drastic hardness reduction down to 125.325, driven by the dissolution of the rigid martensite structure into a ductile ferrite phase, accompanied by carbon spheroidization. In conclusion, crab shells are highly effective as an eco-friendly energizer that drastically boosts carbon diffusion, while modulating the tempering temperature provides precise control over the material's hardness-to-ductility balance. Keyword : St-42 low-carbon steel, pack carburizing, crab shell, tempering, Rockwell (HRC) method
Studi Sifat Mekanis Baja Karbon Rendah Akibat Perbedaan Holding Time dalam Proses Pack Carburizing Menggunakan Katalis Cangkang Kerang Edison Effendy; Marselino Matahelumual
Journal Mechanical Engineering Vol. 3 No. 3 (2025): DESEMBER
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v3i3.3873

Abstract

This research aims to evaluate the surface hardness improvement of S-35C steel through the pack carburizing process using an eco-friendly catalyst alternative. The use of conventional, toxic Barium Carbonate (BaCO3) is replaced with a bio-energizer derived from marine shell waste, which is rich in natural Calcium Carbonate (CaCO3). The research method utilized was experimental, where steel specimens were completely buried in a media mixture of 60% nani wood charcoal and 40% shell powder. The heating process was conducted at a target temperature of 900°C with holding time variations of 15, 30, and 45 minutes, followed by rapid quenching in SAE 20-50 oil. Hardness testing was performed using a Rockwell (HRC) scale machine. The results indicate that the use of the seashell biocatalyst effectively increased the surface hardness value of the steel. There is a directly proportional relationship between the holding time duration and the hardness improvement. The most optimal hardness value was achieved at a holding time of 45 minutes, showing a net increase of +20.38 units (21.60%) from an initial average of 94.33 units to 114.71 units. A physical deceleration phenomenon in the carbon diffusion rate was also observed as the holding time increased, which strongly aligns with Fick's Second Law of Diffusion. Keyword : pack carburizing, shell waste, hardness, holding time

Page 12 of 12 | Total Record : 113

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