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All Journal Jurnal Mekanik Terapan Journal Of Industrial Engineering & Technology Innovation
Andromeda, Tata
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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PENGARUH MEDIA PENDINGIN TERHADAP KEKERASAN BAJA KARBON: STUDI EKSPERIMENTAL PADA VARIASI QUENCHING MEDIA Andrianto, Sis Nanda Kus; Andromeda, Tata; Sasongko, Muhammad Ilman Nur; Yazirin, Cepi
Journal of Industrial Engineering & Technology Innovation Vol. 3 No. 2 (2025): Journal of Industrial Engineering & Technology
Publisher : LENVARI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61105/jieti.v3i2.360

Abstract

This research analyzes the effect of cooling media types on the hardness of carbon steel through the quenching process using water, oil, and air. Variations of cooling media are selected based on differences in cooling rates that theoretically affect the transformation of microstructures, especially the formation of martensite. The research method is experimental by heating carbon steel to 850 °C, followed by quenching on three different media. The Rockwell C hardness test shows a significant difference between the three media. Water-cooled samples have the highest hardness value, followed by oil, while air cooling produces the lowest hardness. This result is in line with the cooling rate theory and phase transformation kinetics (TTT/CCT diagram). Research findings contribute to the optimization of the heat treatment process in the manufacturing industry to choose a cooling medium that is suitable for the strength and toughness of the components.
Analisis Sifat Mekanik dan Penyerapan Air Komposit Polyester Berbasis Serat Alami Kus Andrianto, Sis Nanda; Maulana, Jibril; Sentosa Riyanto, Obaja Eden; Tsamroh, Dewi Izzatus; Nur Sasongko, Muhammad Ilman; Andromeda, Tata; Simangunsong, Rahel; Fahrozy, Muhammad Micho
Jurnal Mekanik Terapan Vol 6 No 3 (2025): Desember 2025
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/jmt.v6i3.7978

Abstract

Natural fibers are increasingly utilized as reinforcing materials in the modern materials industry. In this study, composites comprising 15% untreated coconut fiber, pineapple leaf fiber, palm fiber, corn husk fiber, or sugar cane fiber and 85% polyester were fabricated. Water absorption was evaluated by immersing the composites for 3, 7, 14, and 21 days. The tensile strength and morphology of unsoaked composites were also assessed to determine the influence of fiber type. Water absorption increased with immersion time for all composites, although the trends varied among fiber types. The coconut fiber composite exhibited the highest water absorption rate, whereas the pineapple leaf fiber composite demonstrated the lowest. The pineapple leaf fiber composite also achieved the highest tensile strength. In contrast, composites containing coconut fiber, palm fiber, corn husk fiber, and sugar cane fiber displayed lower tensile strength, attributed to imperfect interfacial bonding between the fibers and the polyester matrix.
Co-Authors Andrianto, Sis Nanda Kus Dewi Izzatus Tsamroh Fahrozy, Muhammad Micho Jibril Maulana Kus Andrianto, Sis Nanda Muhammad Ilman Nur Sasongko Sentosa Riyanto, Obaja Eden Simangunsong, Rahel Yazirin, Cepi