Cahyono, Rian Dwi (2025) ANALISA PENGARUH VARIABEL SUMBER KARBON DAN HOLDING TIME PADA PROSES PACK CARBURIZING PADA BAJA AISI 1020 TERHADAP KEKERASAN, KETANGGUHAN DAN STRUKTUR MIKRO. Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.
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Abstract
Penelitian ini bertujuan untuk menganalisis pengaruh variasi waktu penahanan (holding time) dan jenis media karbon terhadap sifat mekanik dan struktur mikro baja karbon rendah AISI 1020 yang telah mengalami proses pack carburizing. Perlakuan dilakukan pada suhu 875°C dengan waktu penahanan 1 jam, 2 jam, dan 3 jam. Media karbon yang digunakan adalah arang tempurung kelapa dan arang tongkol jagung. Proses quenching dilakukan dengan media pendingin air. Pengujian yang dilakukan meliputi uji kekerasan Rockwell, uji impak Charpy, dan pengamatan struktur mikro menggunakan mikroskop metalurgi. Hasil penelitian menunjukkan bahwa proses pack carburizing dapat meningkatkan kekerasan dan ketangguhan baja AISI 1020 secara signifikan. Nilai kekerasan tertinggi sebesar 72,5 HRC diperoleh pada spesimen dengan media karbon arang tongkol jagung dan holding time 3 jam, sementara nilai impak tertinggi sebesar 222,358 Joule (2,7 J/mm²) diperoleh pada media karbon yang sama dengan holding time 2 jam. Arang tongkol jagung menghasilkan sifat mekanik yang lebih unggul dibandingkan arang tempurung kelapa meskipun memiliki kandungan karbon yang relatif lebih rendah. Hal ini disebabkan oleh struktur pori arang tongkol jagung yang lebih halus dan luas permukaan lebih besar, serta kandungan unsur katalis alami seperti kalium (K) dan kalsium (Ca) yang mempercepat difusi karbon. Pengamatan struktur mikro menunjukkan peningkatan formasi fasa martensit seiring bertambahnya waktu penahanan dan efektivitas media karbon. Spesimen dengan waktu penahanan lebih lama menghasilkan lebih banyak martensit yang berkontribusi terhadap peningkatan kekerasan. Namun, waktu penahanan yang terlalu lama juga dapat menyebabkan over-carburizing yang menurunkan ketangguhan material. Dengan demikian, waktu penahanan optimal pada proses carburizing baja AISI 1020 adalah 2 jam, dengan media karbon terbaik adalah arang tongkol jagung, karena menghasilkan keseimbangan terbaik antara kekerasan dan ketangguhan. Kata kunci: AISI 1020, pack carburizing, arang tempurung kelapa, arang tongkol jagung, kekerasan, impact, struktur mikro
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Kata kunci: AISI 1020, pack carburizing, arang tempurung kelapa, arang tongkol jagung, kekerasan, impact, struktur mikro |
| Subjects: | T Technology > TJ Mechanical engineering and machinery |
| Divisions: | Fakultas Teknik > Program Studi Teknik Mesin |
| Depositing User: | 1422100074 Rian Dwi Cahyono |
| Date Deposited: | 24 Jun 2026 07:45 |
| Last Modified: | 24 Jun 2026 07:45 |
| URI: | http://repository.untag-sby.ac.id/id/eprint/41370 |
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