FUAD ANSORI, . (2025) PENGARUH VARIASI TEMPERATUR PEMANASAN PADA PROSES QUENCHING MENGGUNAKAN MEDIA OLI MESIN TERHADAP STRUKTUR MIKRO, NILAI KEKERASAN DAN LAJU KOROSI BAJA AISI 4140. Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.
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Abstract
Baja AISI 4140 merupakan baja paduan menengah yang banyak digunakan karena kekuatan, ketangguhan, dan ketahanan aus yang baik. Namun, untuk aplikasi maritim yang bersifat korosif, diperlukan optimasi melalui perlakuan panas. Penelitian ini bertujuan mengkaji pengaruh temperatur austenisasi terhadap struktur mikro, kekerasan, dan laju korosi baja AISI 4140 yang didinginkan menggunakan oli SAE 10W-40. Sampel dipanaskan pada temperatur 800°C, 850°C, dan 900°C selama 25 menit, lalu didinginkan cepat. Karakterisasi dilakukan melalui uji struktur mikro, kekerasan Vickers, dan uji korosi metode weight loss dalam larutan NaCl 3,5% selama 96 jam. Hasil menunjukkan bahwa kenaikan temperatur austenisasi memengaruhi pembentukan martensit dan ukuran butir. Temperatur 800°C menghasilkan kekerasan tertinggi (586,36 HV) dan korosi lebih rendah dibandingkan temperatur 900°C (508,54 HV dan 92,12202 mpy). Temperatur austenisasi terbukti berpengaruh terhadap kekerasan dan ketahanan korosi. Temperatur 800°C dinilai paling optimal karena menghasilkan martensit dominan dengan kekerasan tinggi dan laju korosi yang lebih rendah, sehingga direkomendasikan untuk penggunaan baja AISI 4140 di lingkungan maritim. ***** AISI 4140 steel is a medium alloy steel that is widely used because of its good strength, toughness, and wear resistance. However, for corrosive maritime applications, optimization through heat treatment is required. This study aims to examine the effect of austenitizing temperature on the microstructure, hardness, and corrosion rate of AISI 4140 steel cooled using SAE 10W-40 oil. The samples were heated at temperatures of 800°C, 850°C, and 900°C for 25 minutes, then rapidly cooled. Characterization was carried out through microstructure tests, Vickers hardness, and weight loss corrosion tests in 3.5% NaCl solution for 96 hours. The results showed that increasing austenitizing temperature affected the formation of martensite and grain size. A temperature of 800°C produced the highest hardness (586.36 HV) and lower corrosion compared to a temperature of 900°C (508.54 HV and 92.12202 mpy). Austenicization temperature has been shown to affect hardness and corrosion resistance. The temperature of 800°C is considered the most optimal because it produces dominant martensite with high hardness and lower corrosion rate, so it is recommended for the use of AISI 4140 steel in maritime environments.
| Item Type: | Thesis (Sarjana) |
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| Additional Information: | 1). Drs. Sopiyan, M.Pd. ; 2). Dr. Ferry Budhi Susetyo, M.T., M.Si. |
| Subjects: | Teknologi dan Ilmu Terapan > Teknologi (umum) Teknologi dan Ilmu Terapan > Teknik Mesin, Mekanika Teknik Teknologi dan Ilmu Terapan > Otomotif, Astronotika Teknologi dan Ilmu Terapan > Teknik Pertambangan, Metalurgi |
| Divisions: | FT > S1 Pendidikan Teknik Mesin |
| Depositing User: | Users 28141 not found. |
| Date Deposited: | 04 Aug 2025 03:31 |
| Last Modified: | 04 Aug 2025 03:31 |
| URI: | http://repository.unj.ac.id/id/eprint/57379 |
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