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All Journal Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Jurnal Konversi Energi dan Manufaktur
Muhammad Fatihuddin
Universitas Negeri Jakarta
Aerospace Engineering Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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EFEK POLARITAS DAN MEDIA PENDINGIN TERHADAP NILAI KEKERASAN PERMUKAAN HARDFACING BAJA KARBON RENDAH Ferry Budhi Susetyo; Ahmad Kholil; Muhammad Fatihuddin
Jurnal Konversi Energi dan Manufaktur Vol. 6 No. 1 (2019)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (462.758 KB) | DOI: 10.21009/JKEM.6.1.1

Abstract

Penelitian ini menggunakan material baja karbon rendah yang di lapis dengan elektroda HV 450 dengan proses SMAW. Stelah selesai di las kemudian diheat treatment dengan temperatur 1000oC dengan penahanan waktu selama 60 menit kemudian dilakukan quenching. Media quenching yang digunakan dalam penelitian yaitu oli dan air. Hasil penelitian ini menunjukan polaritas DC+ menghasilkan kekerasan yang lebih tinggi pada semua spesimen yang diuji dengan nilai 418,66 VHN quenching air, 402,8 VHN quenching oli, 348 VHN non treatment jika dibandingkan polaritas DC- dengan nilai 405,92 VHN quenching air, 374,02 VHN quenching oli dan 323,38 VHN non treatment. Media quenching dengan air menghasilkan kekerasan yang paling tinggi dengan nilai 405,92 VHN untuk polaritas DC- dan 418,66 VHN untuk polaritas DC+ jika dibandingkan dengan oli.
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.
Co-Authors Ahmad Kholil Basori Basori Lukman Arhami Muhammad Yunan Hasbi Muhammad Yunan Hasbi Reza febriano Armas Satrio Dwifatan Sulistio Susetyo, Ferry Budhi Syamsuir