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All Journal Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Jurnal Teknologi Bahan dan Barang Teknik
Nasution, Fadlin Qisthi
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Computer Science & IT Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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ANALISIS MIKROSTRUKTUR DAN SIFAT MEKANIK DARI BAJA TAHAN KARAT BEBAS NIKEL Nasution, Fadlin Qisthi
Jurnal Teknologi Bahan dan Barang Teknik Vol 12, No 1 (2022)
Publisher : Balai Besar Bahan dan Barang Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37209/jtbbt.v12i1.235

Abstract

Baja tahan karat austenitik adalah jenis baja tahan karat yang paling banyak diproduksi di dunia. Akhir-akhir ini terjadi fluktuasi harga nikel mentah yang berdampak negatif pada produksi baja tahan karat austenitik. Dari penelitian awal, ditemukan paduan multikomponen BCC fase tunggal dalam sistem paduan Fe-Cr-X-Y yang berpotensi menggantikan baja tahan karat austenitik. Penelitian ini difokuskan untuk mempelajari lebih lanjut struktur mikro dan perubahan sifat mekanik pada sistem paduan Fe-Cr-X-Y. Ternyata bahwa peningkatan kandungan kromium meningkatkan kekerasan dan mengurangi keuletan paduan. Penambahan 5% elemen X dan Y masing-masing dalam sistem paduan telah dapat menghasilkan berbagai paduan yang tidak mengandung fase sigma, yang merusak sifat mekanik baja tahan karat feritik, bahkan setelah perlakuan panas yang lama pada 300-500 oC. Namun, masih ada peningkatan kekerasan ketika paduan diberi perlakuan panas pada suhu tersebut. Ini menandakan pemisahan fase α dan α’ karena immiscibility dalam larutan padat. Studi lebih lanjut diperlukan untuk memecahkan masalah pemisahan fase ini.
Decanter Brand Selection Using Multi-Criteria Decision Making: A Case Study Nasution, Fadlin Qisthi; Nasution, Muhammad Ansori; Rivani, Meta
Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri Vol. 26 No. 1 (2024): June 2024
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/jti.26.1.77-86

Abstract

Decanters play a crucial role in Palm Oil Mills by separating the oil phase from the sludge underflow in continuous settling tanks during the clarification process. Given the significance of decanters and the multitude of manufacturers, this study focuses on a comprehensive evaluation of three-phase decanter brands selection. Utilizing the analytic hierarchy process, the research explores the nuanced criteria of economics, technical aspects, and service quality for brand selection. Sub-criteria include operational cost, price, overhaul cost, emulsion content, oil losses, capacity, distance to buffer tank, electricity consumption, service scheme, guarantee, spare part availability, and workshop location. The alternatives considered are common decanter brands in Indonesia: Alfa Laval, IHI, Flottweg, and Westfalia. Using Expert Choice®, the analysis identifies Flottweg as the optimal decanter brand based on performance, particularly excelling in service criteria with a priority weight of 0.336. Sensitivity analysis indicates that for IHI to be considered the first option, technical and economic criteria must be prioritized above 56.5% and 50.0%, respectively. This study also concluded that technical and service aspects are equally important in decision-making for the decanter brand in POM A, surpassing economic ones, with service aspects as the critical factor in decanter brand decision-making.
Co-Authors Nasution, Muhammad Ansori Rivani, Meta