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All Journal JURNAL CRANKSHAFT Journal of Metallurgical Engineering and Processing Technology
Bahiy, Oktavian Khayyan
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Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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Pengaruh Proses Post Weld Heat Treatment pada Hasil Pengelasan Baja S355J2 terhadap Kekuatan Tarik dan Struktur Mikro Shaleh, Mansyur Abdul; Bahiy, Oktavian Khayyan; Alfin, Muhammad; Remon, Aulia Irelin Sekar
JURNAL CRANKSHAFT Vol 8, No 1 (2025): Jurnal Crankshaft Vol.8 No.1 (2025)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/cra.v8i1.14036

Abstract

Post weld heat treatment merupakan sebuah perlakuan panas pasca pengelasan yang bertujuan untuk mengubah sifat fisik atau mekanik logam. Dalam penelitian ini post weld heat treatment yang digunakan berupa stress relief annealing pada 2 baja S355J2 yang salah satunya tidak mengalami PWHT dan mengalami PWHT serta proses pengelasan dilakukan dengan metode GMAW. Proses stress relief annealing ini dilakukan dengan temperatur 635ºC dengan holding time selama 1 jam dan diikuti dengan pendinginan lambat di dalam tungku. Kekuatan tarik yang dimiliki pada baja yang tidak mengalami stress relief annealing sebesar 530 MPa dan 431,3 MPa pada baja yang mengalami stress relief annealing. Terdapat perubahan bentuk pada struktur mikro material yang mengalami post weld heat treatment, dimana pada baja yang tidak mengalami stress relief annealing memiliki batas butir yang nampak lebih tegas menjadi lebih meregang pada tiap butirnya. Selain itu juga fasa pearlite yang terkandung pada material yang mengalami stress relief annealing lebih sedikit dan didominasi oleh fasa ferrite.
Analysis of the Effect of Tuyere Angle on Velocity and Temperature Distribution in a Blast Furnace Using Computational Fluid Dynamics Method Bahiy, Oktavian Khayyan; Abdul Shaleh, Mansyur
Journal of Metallurgical Engineering and Processing Technology (August 2025)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

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Abstract

This study aims to explore the impact of tuyere angle variation on velocity and temperature distribution in a blast furnace using Computational Fluid Dynamics (CFD) methods. The tuyere angles analyzed in this research include 4°, 6°, 8°, and 10°. Understanding the resulting velocity and temperature distributions from these variations is crucial in metallurgical processes, as it directly affects thermal efficiency and the quality of the end product. Simulation results revealed that increasing the tuyere angle from 4° to 8° led to more stable and uniform airflow patterns, as well as optimal heat distribution. However, when the tuyere angle was further increased to 10°, there was a noticeable instability in airflow and temperature distribution, which resulted in a decrease in process efficiency. This indicates a direct correlation between the increase in tuyere angle and flow stability up to the optimal point at 8°, beyond which performance declines. The study concludes that an 8° tuyere angle is the most ideal for use in blast furnaces, as it provides the most efficient heat distribution and airflow.
Co-Authors Abdul Shaleh, Mansyur Alfin, Muhammad Remon, Aulia Irelin Sekar Shaleh, Mansyur Abdul