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All Journal Jurnal Sains dan Teknologi Jurnal Polimesin
Faizah Ali
Universitas Jember
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Dentistry Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Public Health Veterinary

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Studi Eksperimental Pengaruh Variasi Parameter Perlakuan Panas terhadap Kekerasan Baja Tulangan Polos BJTP280 Imam Rudi Sugara; Dwi Wahyu Hardiyanto; Faizah Ali; Elvira Wahyu Arum Fanani
INSOLOGI: Jurnal Sains dan Teknologi Vol. 4 No. 5 (2025): Oktober 2025
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v4i5.6485

Abstract

The construction and manufacturing industries require materials with optimal mechanical properties, particularly hardness and toughness. BJTP280 structural steel, classified as low-carbon steel, has the potential to enhance its mechanical properties through heat treatment. This study aims to analyze the effect of variations in austenitizing temperature, holding time, and cooling medium on the hardness and microstructure of the steel. Specimens measuring 10 × 8 mm were heated at temperatures of 750°C, 800°C, and 850°C with holding times of 60, 90, and 120 minutes, followed by cooling in air, oil, and water. Hardness tests were conducted using the Brinell method, while the microstructure was observed with an optical microscope. The results showed that the cooling medium had a significant effect. The highest hardness values were obtained with water quenching at 178 HB, oil quenching at 174 HB, and air cooling at 144 HB. Hardness tended to decrease with increasing holding time due to austenite grain growth. An austenitizing temperature of 800°C produced the optimum condition with the highest hardness value, while 850°C resulted in lower hardness because of excessively coarse grain structures. In conclusion, the best heat treatment was achieved at 800°C, water quenching, and a holding time of 60 minutes.
Effect of stirring duration on the mechanical properties and fracture morphology of Al-Si-Cu/Al₂O₃ composites Imam Rudi Sugara; Salahudin Junus; Rahma Rei Sakura; Faizah Ali; Dwi Wahyu Hardiyanto; Elvira Ayu Arum Fanani; Haidzar Nurdiansyah; Randy Achmad Iqbal Budiadi
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i4.9317

Abstract

Aluminum matrix composites often suffer from low mechanical performance due to poor reinforcement distribution and manufacturing defects during the stir casting process. This study aims to evaluate the effect of stirring duration on the mechanical properties, microstructural distribution, and fracture behaviour of Al-Si-Cu matrix composites reinforced with Al2O3 particles. Composites were fabricated using varying mechanical stirring durations of 5, 10, 15, and 20 minutes, with three replicates evaluated for each experimental condition (n=3). Material performance evaluation was conducted through Ultimate Tensile Strength (UTS), elongation at break, and Brinell hardness (HBW) testing, accompanied by Scanning Electron Microscopy (SEM) for microstructural and fracture morphology analysis. The results indicate that mechanical properties followed a parabolic trend with increasing stirring duration. A 10-minute stirring duration was optimal, achieving peak UTS (163.33 MPa), maximum elongation, and highest hardness (87.32 HBW). Microstructural SEM observation revealed uniform Al2O3 particle dispersion and solid interfacial bonding at 10-minute, yielding a ductile fracture with fine dimples. Conversely, prolonged stirring for 20 minutes significantly reduced UTS to 56.78 MPa and deteriorated elongation, suspected to be due to gas entrapment porosity and particle pull-out voids, which triggered a cleavage-dominated brittle fracture mode. In conclusion, controlling stirring duration is critical to optimizing microstructural homogeneity, enhancing ductility, and preventing premature failure in cast composites.
Co-Authors Dwi Wahyu Hardiyanto Elvira Ayu Arum Fanani Elvira Wahyu Arum Fanani Haidzar Nurdiansyah Imam Rudi Sugara Rahma Rei Sakura Randy Achmad Iqbal Budiadi Salahudin Junus