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INVESTIGATION OF TEMPERATURES AND HOLDING TIMES ON HIGH-STRENGTH LOW-ALLOY STEEL FOR TANK TRACK LINKS Selly Septianissa; Widantha, Komang Widhi; Waldi, Muhamad
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 2 (2024): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i2.87-92

In Indonesia, the reliance on foreign countries for military components persists, including tank track links which are crucial for combat vehicles. These components require mechanical properties such as wear resistance and toughness to ensure high safety standards. High Strength Low Alloy (HSLA) steel is used, necessitating precise composition and appropriate heat treatment processes. This study varied compositions and heat treatments to achieve desired properties, producing prototypes with five predetermined compositions. The heat treatment process involves initially heating the samples to 860°C for 30 minutes for uniformity, followed by various treatments including quenching in oil, normalizing, and multiple cycles of quenching with tempering at different temperatures and durations to refine microstructure and adjust hardness of the alloy. Results showed optimal mechanical properties in composition no. 4 after normalizing with a blower, achieving a hardness of 31 HRC. This research aimed to optimize mechanical performance during operational conditions through variations in temperatures and holding times.

Penerapan Salinity Meter untuk Deteksi Garam Pada Air di Desa Cibenda, Kecamatan Parigi, Pangandaran Septianissa, Selly; Martoni, Martoni; Chandrasari, Ayu Zahra
Jurnal Pengabdian Pada Masyarakat Vol 9 No 4 (2024): Jurnal Pengabdian Pada Masyarakat
Publisher : Universitas Mathla'ul Anwar Banten

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30653/jppm.v9i4.973

Penggunaan air dengan kadar garam tinggi sering menjadi masalah di daerah pedesaan, seperti Desa Cibenda. Kadar garam yang tinggi dapat menyebabkan korosi pada peralatan logam, mengurangi umur pakai, dan menimbulkan kerugian. Proyek pengabdian ini memperkenalkan detektor konsentrasi garam pada air yang digunakan masyarakat sebagai langkah preventif mengatasi masalah ini. Metode yang digunakan meliputi survei kualitas air, pengembangan dan penerapan detektor konsentrasi garam sederhana, serta penyuluhan tentang pentingnya penggunaan air berkualitas dengan alat salinity meter yang dimodifikasi. Pemahaman masyarakat diukur melalui partisipasi aktif dalam penyuluhan. Meskipun edukasi hanya dilakukan sekali, diharapkan pemahaman masyarakat tetap terjaga melalui pemantauan berkelanjutan. Hasil penerapan detektor menunjukkan bahwa alat ini efektif membantu masyarakat mengidentifikasi dan mengontrol kadar garam dalam air serta mengurangi risiko korosi pada peralatan logam. Pengabdian ini diharapkan memberikan manfaat praktis bagi masyarakat Desa Cibenda dan menjadi contoh bagi daerah lain dengan masalah serupa, serta meningkatkan kualitas hidup dan memperpanjang umur pakai peralatan logam di lingkungan pedesaan. The use of water with high salt content is often a problem in rural areas, such as Cibenda Village. High salt levels can cause corrosion on metal equipment, reducing its lifespan and leading to financial losses. To address this issue, this community service project introduces a salt concentration detector for water used by local residents as a preventive measure. The methods used include conducting a water quality survey, developing and implementing a simple salt concentration detector, and providing education on the importance of using quality water with a modified salinity meter. Community understanding is measured through active participation during the outreach session. Although the education was conducted only once, it is expected that the community’s awareness will remain sustained through ongoing monitoring. The implementation of the detector showed that this tool effectively helps the community identify and control salt levels in their water, thereby reducing the risk of corrosion on metal equipment. This project is expected to provide practical benefits for the residents of Cibenda Village and serve as a model for other areas with similar issues, ultimately improving quality of life and extending the lifespan of metal equipment in rural communities.

Evaluasi Dampak Proses Retrogression dan Reaging dalam Meningkatkan Ketahanan Korosi pada Material AL7175 Septianissa, Selly
Jurnal Rekayasa Energi dan Mekanika Vol 4, No 2 (2024): JREM
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/JREM.v4i2.137

Paduan aluminium 7175 dan seri 7xxx lainnya dikenal memiliki ketahanan korosi sumuran yang rendah. Untuk meningkatkan ketahanan korosi sambil mempertahankan kekuatan, penelitian ini menerapkan metode retrogression dan reaging (RAA), yang merupakan perlakuan panas baru untuk paduan aluminium yang mengalami penguatan presipitasi. Tujuan dari penelitian ini adalah untuk mengevaluasi pengaruh proses RAA terhadap ketahanan korosi sebelum anodisasi asam kromat (CAA) pada dua tegangan, yaitu 20 V dan 40 V. Pengujian yang dilakukan meliputi analisis struktur mikro, komposisi kimia, pengujian kekerasan, ketebalan lapisan, dan ketahanan korosi menggunakan metode salt spray testing. Hasil metalografi menunjukkan pembentukan dua fase, yaitu fase MgZn2 yang terdistribusi di dalam butir. Pengujian salt spray selama 500 jam menunjukkan bahwa material yang melalui proses CAA 20 V dan RAA tidak mengalami korosi sumuran, sementara material dengan CAA 40 V menunjukkan 20 pit akibat anodisasi yang kurang baik. Penelitian ini mengindikasikan bahwa presipitat MgZn2 yang terbentuk melalui proses RAA berkontribusi pada peningkatan ketahanan korosi material paduan aluminium 7175.

Corrosion Rate of ASTM A53 Steel in Seawater Influenced by Variation in Concentration of Mangifera Indica L. Peel Extract Selly Septianissa; Ayu Zahra Chandrasari
Journal of Applied Engineering and Technological Science (JAETS) Vol. 6 No. 1 (2024): Journal of Applied Engineering and Technological Science (JAETS)
Publisher : Yayasan Riset dan Pengembangan Intelektual (YRPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37385/jaets.v6i1.5182

This study investigates the effectiveness of mango peel extract as a corrosion inhibitor for ASTM A53 steel, which is widely used in the oil and gas industry. The research aims to evaluate how different concentrations of mango peel extract can mitigate corrosion in seawater from Pangandaran, thereby extending the lifespan of steel components in marine environments. Corrosion tests were conducted through immersion experiments over durations of 1, 4, 9, 16, and 25 days with mango peel extract concentrations of 0 ppm, 20 ppm, 40 ppm, 60 ppm, and 80 ppm. Analytical methods including X-ray diffraction (XRD), Optical Microscopy (OM), energy dispersive spectroscopy (EDS), and scanning electron microscopy (SEM) were used to examine the steel's surface morphology and chemical composition. The results demonstrate that mango peel extract significantly reduces the corrosion rate of ASTM A53 steel, with the highest efficiency achieved at 40 ppm (58.15%) and a notable reduction at 60 ppm (56.4%). The inhibition is attributed to chemical absorption, which lowers the steel's corrosion potential. These findings suggest that mango peel extract is an effective, eco-friendly corrosion inhibitor, offering practical and theoretical benefits for corrosion management. This research supports the use of bio-based inhibitors and may inform future industrial corrosion protection strategies.

OPTIMALISASI KUALITAS AIR DI KOBER DAARUL AMAL MENGGUNAKAN SISTEM FILTRASI UNTUK MENINGKATKAN SANITASI LINGKUNGAN DAN KESEHATAN ANAK Sofia, Evi; Septianissa, Selly; Suryaman, Nia Nuraeni; Komarudin, Udin; Martoni, Martoni; Chandrasari, Ayu Zahra; Prasetia, Adhita; Zanika, Sugih Yusuf; Nugraha, Suhud; Trisnawan , Lukman
Jurnal Abdi Insani Vol 12 No 6 (2025): Jurnal Abdi Insani
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/abdiinsani.v12i6.2604

Daarul Amal Playgroup (KOBER), an early childhood education establishment situated in Bandung City, plays a pivotal role in fostering an intelligent and healthy generation. Nonetheless, despite its significant role in educating children, this institution encounters some obstacles, particularly with the quality of water utilized in everyday operations. This community service initiative seeks to enhance water quality at KOBER Daarul Amal by instructing students on the significance of clean water and implementing a filtration system utilizing three filter media: zeolite, ferrolite, and activated charcoal. The outcomes of the educational initiatives for students indicated an increased awareness regarding the significance of clean water. The outcomes of educational initiatives indicate that students have increased their awareness regarding the significance of clean water. Furthermore, the implementation of water filtration has enhanced the water quality at the site, as demonstrated by the initial TDS test results, which ranged from 455.3 ppm to 359,7 ppm, and the turbidity value, which decreased from 4.50 NTU to 4.48 NTU. In addition, based on the results of the questionnaire given to the teachers, it can also be concluded that this community service activity has met its targets.

Behavior of Bare, Cr3C2-20NiCr, and NiCrAlY coated Fe-Ni Based Superalloy Under Hot Corrosion in a 75 wt.% Na2SO4 + 25wt.% NaCl film at 9000C Septianissa, Selly; Chandrasari, Ayu Zahra
International Journal of Science and Society Vol 6 No 2 (2024): International Journal of Science and Society (IJSOC)
Publisher : GoAcademica Research & Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54783/ijsoc.v6i2.1170

The main aim of this research is to assess the resistance to hot corrosion of untreated Fe-Ni-based superalloys compared to those coated with Cr3C2-20NiCr and NiCrAlY. These superalloys are strengthened through precipitation with ɣ’ Ni3(Al, Ti) and further fortified using high-velocity oxy-fuel (HVOF) thermal spray coating. The evaluation is performed under harsh conditions consisting at a temperature of 900°C for a duration of 25 cycles in a mixture containing 75 wt.% Na2SO4 and 25 wt.% NaCl. An optical microscope (OM) is utilized to determine the coating thickness of the coated specimens. Corrosion kinetics are evaluated by measuring changes in mass at the conclusion of each cycle during the investigation of hot corrosion. Furthermore, X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), and scanning electron microscopy (SEM) are employed to investigate the chemical composition, ascertain phases, and scrutinize the surface morphology of the corrosion products. The findings reveal that the Fe-Ni superalloy, coated with precipitation-strengthened layers, demonstrates enhanced resistance to hot corrosion compared to the uncoated substrates, as evidenced by reduced weight gain per unit area. The coated substrates are enveloped by protective oxide layers consisting of chromium, nickel, aluminum, and their respective spinels, effectively shielding the substrate surfaces. In contrast, The superalloy without coating, which underwent precipitation hardening within the substrate, showed instances of microspalling and sputtering of the oxide scale. Findings suggested that both Cr3C2-20NiCr and NiCrAlY coatings substantially improved resistance against hot corrosion. Noteworthy was the superior protective efficacy of the NiCrAlY coating over the Cr3C2-20NiCr layer, attributed to the development of protective oxide scales containing Cr2O3 and NiCr2O4.

Mechanical and microstructural effects of varying welding currents in GTAW of 7075-T62 aluminum Septianissa, Selly; Hadining, Wanidya Ni’immallaili; Chandrasari, Ayu Zahra
Jurnal Polimesin Vol 23, No 1 (2025): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i1.6060

Aircraft structures require diverse joining techniques, including riveting, bolting, bonding, and welding. While welding is less common in aerospace manufacturing due to concerns about the thermal sensitivity of aluminum alloys, it offers potential advantages such as weight reduction and the elimination of mechanical fasteners. This study investigates the effect of welding current on the microstructure and mechanical properties of 7075-T62 aluminum alloy welded using Gas Tungsten Arc Welding (GTAW) with ER 4043 filler metal. Welding currents of 40 A, 50 A, and 60 A were examined to assess their influence on tensile strength, hardness, and weld integrity. Results indicate that 50 A produces the highest tensile strength (34.297 kgf/mm²) and hardness (74.8 HRB), whereas 40 A results in lower tensile strength (26.471 kgf/mm²) and hardness (71.7 HRB). At 60 A, excessive heat input leads to increased porosity and deeper penetration, causing microstructural defects. The findings underscore the importance of optimizing welding parameters to balance mechanical performance and minimize defects. This study provides insights that are particularly relevant to aerospace applications, where reliable and high-strength welded joints are critical.

The Heat Treatment Process of Fe-Ni Superalloy for Power Plant Boiler Water Wall Tube Application Chandrasari, Ayu Zahra; Selly Septianissa
JOM Vol 5 No 1 (2024): Indonesian Journal of Humanities and Social Sciences, March 2024
Publisher : Universitas Islam Tribakti Lirboyo Kediri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33367/ijhass.v5i1.5349

Many applications across various industrial sectors express the need for the use of superior materials in performance because they generally involve diverse and challenging environmental conditions. These environmental conditions are often characterized by parameters such as extreme temperatures and pressures, significant temperature gradients, high external stresses, the presence of oxidizing and corrosive environmental species, and the presence of abrasive foreign particles. Some components and machines operating at high temperatures, as seen in coal gasification processes, oil processing, gas turbine engines and power generation, steam turbines, as well as metal processing industries, greatly require materials with exceptional performance. The experimental approach begins with the formation of Fe-Ni superalloy samples using a mini DC electric arc furnace. After a series of tests, the samples are then analyzed and characterized using various methods, including optical microscopy, X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Energy-Dispersive X-ray Spectroscopy (EDS). The results of this research are expected to provide valuable insights into the consideration of material usage in Steam Power Plants (PLTU) and similar applications.

Investigation of Drying Time and Final Moisture Content of Arabica beans in a Solar Drying Chamber Ramdhani, Rendi; Septianissa, Selly; Rajani, Ahmad
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 14 No. 6 (2025): December 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtepl.v14i6.2239-2249

Drying is a critical stage that affect directly the quality, storability, and market value of Arabica coffee beans. The objective of this study was to investigate the performance of a solar drying chamber integrated with a thermal collector and phase change material (PCM), operated under a constant airflow velocity of 9.2 m/s. Arabica beans of 1500 g were dried over two observation days, with chamber temperatures ranging from 40 °C to 46.5 °C and peak solar radiation of 1122 W/m². The results showed that the system effectively maintained thermal stability and drying performance despite fluctuations in solar input. The analysis revealed at Day 2 achieved a higher and faster moisture reduction due to improved solar conditions and absorber efficiency, with drying rates peaking at over 42 g vapor per hour in the third hour. In contrast, at Day 1 the drying rate peaked in the third hour at approximately 22.45 g vapor/h. Day 1 exhibited a more stable but slower drying trend. Overall, the system successfully reduced the beans’ moisture content to below 12.8% in within under 14 hours, with Tray 2 delivering the most consistent results. These findings demonstrate that the integration of solar thermal energy, PCM, and forced convection application significantly improved drying efficiency and reliability, offering a sustainable alternative for post-harvest processing, especially in regions with variable weather conditions.

INVESTIGATION OF TEMPERATURES AND HOLDING TIMES ON HIGH-STRENGTH LOW-ALLOY STEEL FOR TANK TRACK LINKS Selly Septianissa; Komang Widhi Widantha; Muhamad Waldi
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 2 (2024): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i2.87-92

In Indonesia, the reliance on foreign countries for military components persists, including tank track links which are crucial for combat vehicles. These components require mechanical properties such as wear resistance and toughness to ensure high safety standards. High Strength Low Alloy (HSLA) steel is used, necessitating precise composition and appropriate heat treatment processes. This study varied compositions and heat treatments to achieve desired properties, producing prototypes with five predetermined compositions. The heat treatment process involves initially heating the samples to 860°C for 30 minutes for uniformity, followed by various treatments including quenching in oil, normalizing, and multiple cycles of quenching with tempering at different temperatures and durations to refine microstructure and adjust hardness of the alloy. Results showed optimal mechanical properties in composition no. 4 after normalizing with a blower, achieving a hardness of 31 HRC. This research aimed to optimize mechanical performance during operational conditions through variations in temperatures and holding times.

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