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All Journal Jurnal Rekayasa Mesin Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Jurnal Teknologi dan Rekayasa Alat Berat (JTRAB)
Reza febriano Armas
Universitas Negeri Jakarta
Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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The Effect of Quenching Methods Using Various Concentrations of Saltwater Solutions on the Hardness and Corrosion Rate of Low Carbon Steel After the Hardfacing Process Reza febriano Armas; Muhammad Fatihuddin; Basori; Ferry Budhi Susetyo; Muhammad Yunan Hasbi; Lukman Arhami; Satrio Dwifatan Sulistio
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 8 Number 1 (2026)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v8i1.9461

Abstract

This study analyzes the effect of different saltwater (NaCl) concentrations in the quenching medium on the microstructure, hardness, and corrosion rate of low-carbon steel after the hardfacing process. Hardfacing was performed using a DF2A-450-R electrode, followed by rapid cooling in distilled water containing 3.5%, 7%, and 10.5% NaCl. Microstructure was observed using an Olympus BX51M optical microscope, hardness was tested by the Vickers method, and corrosion behavior was evaluated via electrochemical Open Circuit Potential (OCP) and Linear Sweep Voltammetry (LSV). The results show that higher NaCl concentrations accelerate cooling and promote a more dominant martensitic structure. The 10.5% NaCl specimen achieved the highest hardness of 582.1 HV and exhibited a more positive corrosion potential with the lowest corrosion current. Therefore, the 10.5% NaCl quenching medium provides the optimal balance between hardness improvement and corrosion resistance, making it suitable for post-hardfacing heat treatment of low-carbon steel in demanding industrial applications.
Effect of Oil Viscosity as a Quenching Medium on Hardness and Corrosion Rate of Mild Steel After Hardfacing Muhammad Fatihuddin; Reza Febriano Armas; Ferry Budhi Susetyo; Syamsuir; Basori; Muhammad Yunan Hasbi
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 8 Number 1 (2026)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v8i1.9464

Abstract

This study investigates the effect of oil viscosity as a quenching medium on the hardness and corrosion rate of mild steel after hardfacing. The specimens were quenched using oils of different viscosities (SAE 30, SAE 40, and SAE 50) after hardfacing treatment. Microstructural analysis using an Olympus BX51M optical microscope revealed that lower-viscosity oil produced a more dominant martensitic phase, while higher-viscosity oils resulted in greater formation of ferrite and pearlite due to slower cooling rates. The Vickers hardness test showed the highest hardness value of 460.44 VHN for SAE 30, decreasing to 415.18 VHN for SAE 50. Electrochemical testing indicated that the corrosion current density (Icorr) and corrosion rate increased with oil viscosity, from 95.2 µA/cm² and 1.114 mmpy (SAE 30) to 129.1 µA/cm² and 1.511 mmpy (SAE 50). The results demonstrate that lower-viscosity oils enhance martensitic transformation, improve hardness, and reduce corrosion rate, highlighting viscosity control as a key factor in optimizing post-hardfacing heat treatment performance.
Effect of NaCl Concentration in Quenching Medium on Microstructure, Hardness, and Corrosion Behavior of AISI 4140 Steel Syaripuddin; Sopiyan; Rany Anggraini; Adi Tri Tyassmadi; Silalahi Jose Jan Filder; Muhammad Dhafa Irziansyah; Syamsuir; Ahmad Lubi; Muhammad Fatihuddin; Reza Febriano Armas; Ferry Budhi Susetyo
Jurnal ASIIMETRIK Jurnal Ilmiah Rekayasa & Inovasi Volume 8 Number 2 (2026)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v8i2.9970

Abstract

AISI 4140 steel is widely used in engineering and marine components due to its high strength and good hardenability. However, improving hardness through heat treatment may influence the corrosion behavior of the material in chloride containing environments. This study investigates the effect of NaCl concentration as a quenching medium on the microstructure, hardness, and corrosion behavior of AISI 4140 steel. The samples were austenitized at 1000 °C for 15 minutes and quenched in NaCl solutions with concentrations of 3.5%, 7%, and 10.5%. Microstructural observations were carried out using optical microscopy after etching with 3% Nital. Hardness testing was performed using the Vickers method with a 10 kg load, while corrosion behavior was evaluated using weight loss measurements and electrochemical tests in 3.5% NaCl solution. The results show that increasing NaCl concentration produces a finer martensitic structure and increases hardness from 673 VHN at 3.5% NaCl to 762 VHN at 10.5% NaCl. However, the corrosion rate also increases from 0.3688 mmpy to 0.3990 mmpy, indicating higher electrochemical activity at the material surface. These results demonstrate a trade-off between improved hardness and reduced corrosion resistance with increasing NaCl concentration.
Perancangan dan Pengembangan Alat Bantu Khusus untuk Pelepasan Filter Centrifugal Oil Cleaner pada Scania P410 Reza Febriano Armas; Ganjar Widayanto; Rasma; Muhammad Fatihuddin; Mochammad Hamdan Aziz; Andri Prasetyo
Jurnal Teknologi dan Rekayasa Alat Berat Vol 3 No 2 (2026): JTRAB Volume 3, No 2, 2026
Publisher : Department of Mechanical Engineering, Vocational College, Gadjah Mada University.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jtrab.v3i2.25497

Abstract

In mining operations, the maintenance of heavy duty trucks such as the Scania P410 is essential to ensure sustained performance and operational reliability. One critical component of this unit is the centrifugal oil cleaner filter, which maintains oil purity and extends engine lifespan. However, several practical issues arise during maintenance, notably the difficulty of removing the filter housing due to slack nuts and its limited accessibility. This study presents the design and implementation of a special auxiliary tool intended to overcome these challenges and improve maintenance efficiency. The research applied the 7Ups++ innovation method, encompassing problem mapping, root-cause analysis, idea exploration, design, and implementation. The newly developed tool was fabricated using steel materials and validated through field testing at PT United Tractors, Site Muara Teweh–Tuhup. Experimental results demonstrated that the tool effectively facilitates housing removal, reduces the risk of component damage, and shortens maintenance downtime. The solution also contributes to cost reduction, enhanced technician safety, and improved work quality. Standardization and operator training were identified as key elements for broader implementation across field service operations.
Design, Finite Element Analysis, and Experimental Validation of a Jig Holder for SinglecDisc Metallographic Polishing Machines Ahmad lubi; Niko Ade Saputra; Ferry Budhi Susetyo; Danar Hari Krisyono; Ichsan Arfan Timur; Reza Febriano Armas; Muhammad Fatihuddin
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, Agustus 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Specimen stability during metallographic polishing is critical to obtaining accurate microstructural observations, yet inconsistent pressure in single disc polishing machines often causes non-uniform surface finish and unreliable results. While previous studies have extensively addressed polishing parameters and machine performance, limited attention has been given to auxiliary fixtures that actively maintain specimen stability and pressure consistency, a gap this study addresses. This paper proposes a novel jig holder design that integrates finite element-based structural verification with experimental validation, offering a more consistent alternative to conventional manual polishing. The design methodology comprised requirement analysis, three-dimensional CAD modeling, structural simulation via finite element analysis (FEA) to evaluate von Mises stress, displacement, and factor of safety (FOS), followed by fabrication and experimental testing on Aluminum 6061 specimens under polishing loads of 50 g and 150 g, with manual polishing as a baseline. FEA results confirmed the structural safety of the jig holder, with a maximum von Mises stress of 0.103 MPa and a minimum factor of safety of 10. Experimentally, the jig holder consistently produced lower and more uniform surface roughness (0.220–0.225 μm) than manual polishing (0.235 μm), indicating that consistent, controlled pressure distribution rather than operator dependent manual force is the primary mechanism improving surface quality. These findings demonstrate that the proposed jig holder offers a practical, low cost solution for improving specimen preparation reliability in metallographic laboratories, with potential application in quality sensitive materials characterization workflows.
Co-Authors Adi Tri Tyassmadi Ahmad Lubi Andri Prasetyo Basori Basori Danar Hari Krisyono Ganjar Widayanto Ichsan Arfan Timur Lukman Arhami Mochammad Hamdan Aziz Muhammad Dhafa Irziansyah Muhammad Fatihuddin Muhammad Yunan Hasbi Muhammad Yunan Hasbi Niko Ade Saputra Rany Anggraini Rasma Satrio Dwifatan Sulistio Silalahi Jose Jan Filder Sopiyan Susetyo, Ferry Budhi Syamsuir Syaripuddin Syaripuddin