KEMAS, TAUFIK (2026) PENGARUH CAMPURAN MINYAK JARAK DENGAN Al2O3 TERHADAP SIFAT MEKANIK BAJA S45C. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
This study aims to analyze the effect of adding alumina (Al₂O₃) nanoparticles to castor oil as a quenching medium on the mechanical properties and microstructural characteristics of S45C steel. The independent variable was the Al2O3 concentration of 0%, 0.01%, 0.05%, 0.1%, and 0.5%, while the dependent variables included tensile strength, Vickers hardness, microstructure, and surface characteristics based on Fourier Transform Infrared Spectroscopy (FTIR). Six S45C steel specimens were used, consisting of one raw material specimen and five specimens hardened at 850°C for 120 minutes, followed by quenching in castor oil with various Al2O3 concentrations. Tensile, Vickers hardness, microstructure, and FTIR tests were conducted, and the data were analyzed using a comparative descriptive analysis method. The results showed that quenching in castor oil increased the tensile strength from 244 MPa to 309 MPa and the hardness from 222.3 HV to 291.5 HV. The addition of 0.1% Al2O3 produced the highest tensile strength of 361 MPa, while 0.5% Al2O3 produced the highest hardness value of 323.3 HV. The microstructure changed from ferrite–pearlite to predominantly martensite and bainite, while FTIR analysis indicated changes in absorption peak intensity without the formation of new functional groups. Keywords: S45C Steel, Castor Oil, Alumina (Al₂O₃), Quenching, Mechanical Properties Penelitian ini bertujuan untuk menganalisis pengaruh penambahan nanopartikel alumina (Al2O3) pada media quenching minyak jarak terhadap sifat mekanik dan karakteristik mikrostruktur baja S45C. Variabel bebas penelitian adalah konsentrasi Al2O3 sebesar 0%, 0,01%, 0,05%, 0,1%, dan 0,5%, sedangkan variabel terikat meliputi kekuatan tarik, kekerasan Vickers, struktur mikro, dan karakteristik permukaan berdasarkan pengujian Fourier Transform Infrared Spectroscopy (FTIR). Penelitian menggunakan enam spesimen baja S45C yang terdiri atas satu spesimen raw material dan lima spesimen yang diberi perlakuan panas pada suhu 850°C selama 120 menit, kemudian didinginkan menggunakan media quenching minyak jarak dengan variasi konsentrasi Al2O3. Pengujian yang dilakukan meliputi uji tarik, uji kekerasan Vickers, pengamatan struktur mikro, dan FTIR. Data dianalisis menggunakan metode analisis deskriptif komparatif. Hasil penelitian menunjukkan bahwa proses quenching menggunakan minyak jarak meningkatkan kekuatan tarik dari 244 MPa menjadi 309 MPa dan kekerasan dari 222,3 HV menjadi 291,5 HV. Penambahan Al2O3 sebesar 0,1% menghasilkan kekuatan tarik tertinggi sebesar 361 MPa, sedangkan konsentrasi 0,5% menghasilkan nilai kekerasan tertinggi sebesar 323,3 HV. Struktur mikro berubah dari ferit–perlit menjadi dominan martensit dan bainit, sedangkan hasil FTIR menunjukkan perubahan intensitas pita serapan tanpa terbentuknya gugus fungsi baru. Kata kunci: Baja S45C, Minyak Jarak, Alumina (Al₂O₃), Quenching, Sifat Mekanik.
| Item Type: | Thesis (S1) |
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| NIM/NIDN Creators: | 41322010003 |
| Uncontrolled Keywords: | Baja S45C, Minyak Jarak, Alumina (Al₂O₃), Quenching, Sifat Mekanik. |
| Subjects: | 600 Technology/Teknologi > 620 Engineering and Applied Operations/Ilmu Teknik dan operasi Terapan > 621 Applied Physics/Fisika terapan > 621.8 Machine Engineering, Machinery/Teknik Mesin 600 Technology/Teknologi > 660 Chemical Engineering and Related Technologies/Teknologi Kimia dan Ilmu yang Berkaitan > 661 Technology of Industrial Chemicals/Teknologi Industri Kimia > 661.1 Non Metallic Elements/Elemen Non Logam |
| Divisions: | Fakultas Teknik > Teknik Mesin |
| Depositing User: | khalimah |
| Date Deposited: | 03 Sep 2026 13:44 |
| Last Modified: | 03 Sep 2026 13:44 |
| URI: | http://repository.mercubuana.ac.id/id/eprint/103607 |
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