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All Journal Jurnal Konversi Energi dan Manufaktur JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir
Syamsuir
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Aerospace Engineering Automotive Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Efek waktu tahan baja AISI 4140 terhadap struktur mikro, kekerasan, dan korosi Syamsuir; Syaripuddin; Sopiyan; Indriasti, Zulfah; Anggrainy, Rani; Lubi, Ahmad; Susetyo, Ferry Budhi
Jurnal Permadi : Perancangan, Manufaktur, Material dan Energi Vol 7 No 02 (2025): JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI
Publisher : Universitas Nusa Putra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52005/permadi.v7i02.197

Abstract

Baja AISI 4140 merupakan baja paduan menengah yang sering digunakan dalam aplikasi teknik, termasuk pada komponen kapal, karena memiliki kekuatan tinggi dan potensi untuk ditingkatkan sifat mekaniknya melalui perlakuan panas. Penelitian ini bertujuan untuk mengkaji pengaruh variasi waktu tahan pada proses perlakuan panas terhadap perubahan struktur mikro, kekerasan, dan laju korosi baja AISI 4140. Perlakuan panas dilakukan dengan memanaskan spesimen pada suhu 800°C selama 30 menit dan 45 menit, kemudian diikuti proses quenching menggunakan oli SAE 10W-40. Spesimen tanpa perlakuan panas digunakan sebagai pembanding. Struktur mikro diamati menggunakan mikroskop optik Olympus BX51M, kekerasan diuji dengan metode Vickers menggunakan beban 5 kg, dan korosi diuji dengan metode kehilangan berat dalam larutan NaCl 3,5%. Hasil pengamatan menunjukkan bahwa semakin lama waktu penahanan, struktur mikro didominasi oleh fasa martensit yang lebih halus dan homogen. Hal ini berdampak langsung pada peningkatan kekerasan material, di mana spesimen dengan waktu tahan 45 menit menunjukkan nilai kekerasan tertinggi 658,14 HV dibandingkan spesimen lainnya. Nilai laju korosi tertinggi diperoleh Q-30 melalui pengujian selama 96 jam sebesar 38,02 mpy
SISTEM RESIRKULASI AIR OTOMATIS UNTUK PENGHEMATAN AIR BERSIH DAN ENERGI PADA BUDIDAYA IKAN NILA: The Automatic Water Recirculation System for Clean Water and Energy Saving in Tilapia Farming Sukarno, Ragil; Ramadhan , Muhammad Fajar; Andriansyah, Farezi; Adigutama, Yudha; Syamsuir; Sampurno , Hari
Jurnal Konversi Energi dan Manufaktur Vol. 9 No. 1 (2024)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.9.1.5

Abstract

The acidity and turbidity of water are essential factors in tilapia farming, so it is necessary to control the acidity (pH) and turbidity (NTU) of water. This research aims to develop an automatic water recirculation system to save the use of clean water and energy consumption in tilapia fish farming using a microcontroller based on pH and turbidity (NTU) values. The research method used is experimental, starting with design and manfacture an Experimental apparatus in the form of a fish pond from a box-shaped tarpaulin, a filter system, a water circulation system consisting of pipes and a pump that has a suction power of 25 lpm, an Arduino-based microcontroller water quality controller. Tests were carried out by comparing water's pH and NTU values before and after filtering. The results showed that using a water recirculation system in a fish pond equipped with a filter system and an Arduino-based microcontroller system can significantly maintain the pH value and reduce the turbidity level (NTU). Using a recirculation system provides energy savings for pump consumption of 51.4% at a water flow rate of 15 lpm and 32.3% at a water flow rate of 25 lpm compared to conventional systems. Overall, the recirculation system provides the benefits of energy savings in pump operation, savings in water usage, and controlled water quality.
PENGARUH MEDIA PENDINGIN TERHADAP KARAKTERISTIK MEKANIK DAN STRUKTUR MIKRO PADA PELAT BAJA KARBON RENDAH Iskandarsyah Wicaksono; Sri Ismarwanti; Jan Setiawan; Ferry Budhi Susetyo; Syamsuir
Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol. 27 No. 1 (2021): Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir
Publisher : Badan Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2021.27.1.6187

Abstract

Low carbon steel has high ductility and is easy to shape, so it is widely used in industry and construction. However, this material has low mechanical strength and hardness, so it is easy to wear. Mechanical properties can be improved by heat treatment, namely heating at a specific temperature and holding it for some time and then cooling. Cooling media will affect the level of enhancement in its mechanical properties. Therefore, in this study, observations were done on the mechanical characteristics and microstructure of low carbon steel after heat treatment and cooling on various cooling media. The heating process was carried out at a temperature of 950 °C with a holding time of 15 minutes. The sample is then cooled with a variety of coolants (aqua dest, cooking oil, oil and open-door furnace). The results of the observations on samples of low carbon steel plates (0.0524%) shows that the sample without heat treatment has the highest stress value of 375.75 MPa and the open furnace door cooling has the lowest stress value of 200.53 MPa. The highest strain value occurred in the open-door cooling of 38.77% and the lowest strain value of 25.49% occurred in the cooling with cooking oil. Observation on the material's microstructure before and after heat treatment shows ferrite and pearlite.
Co-Authors Adigutama, Yudha Andriansyah, Farezi Anggrainy, Rani Ferry Budhi Susetyo Ferry Budhi Susetyo Indriasti, Zulfah Iskandarsyah Wicaksono Jan Setiawan Lubi, Ahmad Ramadhan , Muhammad Fajar Sampurno , Hari Sopiyan Sri Ismarwanti Sukarno, Ragil Syaripuddin