Zany, Aldy Faiz Tachta (2024) ANALISA PENGARUH VARIASI TEMPERATUR DAN HOLDING TIME PADA PROSES LAKU PANAS TEMPERING BAJA AISI 4340 TERHADAP SIFAT MEKANIS DAN STRUKTUR MIKRO. Undergraduate thesis, Universitas 17 Agustus 1945.
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Abstract
Baja AISI 4340 merupakan baja paduan rendah dengan kekuatan tinggi yang banyak digunakan dalam industri otomotif, dirgantara, dan permesinan. Penelitian ini bertujuan untuk menganalisis bagaimana variasi temperatur dan durasi holding time pada proses tempering mempengaruhi sifat mekanis dan struktur mikro baja AISI 4340 Untuk meningkatkan sifat mekanisnya, baja ini umumnya menjalani proses hardening dan tempering. Tujuan utama dari proses ini adalah meningkatkan karakteristik material seperti kekuatan, kekerasan, ketangguhan, dan ketahanan terhadap keausan. Selanjutnya dilakukan proses tempering untuk mengurangi kerapuhan dengan memanaskan baja pada suhu yang lebih rendah. Selain itu, waktu tertentu dalam setiap tahapan penting untuk memastikan transformasi struktur berlangsung sempurna dan konsisten. Temperatur hardening yaitu 850˚C waktu tahan 60 menit dilakukan pada semua material uji, Dilanjut dengan tempering dengan variasi suhu yaitu 150˚C 200˚C 300˚C dan waktu tahan 30 60 90 menit. Dari pengaruh perlakuan hardening dengan suhu 850˚C waktu tahan 60 menit pada material baja AISI 4340 media pendinginan air didapatkan nilai rata-rata kekerasan 45,6 HRC lebih tinggi di bandingkan dengan material perlakuan tempering 150˚C waktu tahan 90 menit menggunakan media pendingin suhu ruang yang memiliki nilai kekerasan paling tinggi 43,3 HRC di temperatur dan yang paling rendah 34,3 HRC dengan perlakuan tempering 250˚C waktu tahan 90 menit. Pada pengujian tarik nilai tegangan dan regangan paling tinggi di dapat pada perlakuan hardening 850˚C waktu tahan 60 menit menggunakan media pendingin air dengan nilai regangan sebesar 17,97% dan tegangan sebesar 87,64 N/mm2 dan pada perlakuan tempering 150˚C waktu tahan 30 menit dengan media pendingin suhu ruang diperoleh nilai tegangan paling tinggi sebesar 84,47 N/mm2 dan regangan paling tinggi sebesar 16,29% serta yang paling rendah adalah tempering tegangan dengan nilai 58,79 N/mm2 dan regangan dengan nilai 12,60%, Sedangkan untuk nilai elastisitas hardening 850˚C waktu tahan 90 menit adalah 5,32 N/mm2 dan untuk elastisitas terendah yaitu tempering 250˚C waktu tahan 90 menit nilai 4,59 N/mm2. Dapat disimpulkan bahwa material baja AISI 4340 dengan perlakuan Hardening suhu 850˚C media pendingin air akan mengalami penurunan nilai kekerasan, tegangan, keuletan, serta regangan setelah mengalami perlakuan tempering. Kata kunci: hardening, tempering, holding time, baja AISI 4340
| Item Type: | Thesis (Undergraduate) |
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| Uncontrolled Keywords: | hardening, tempering, holding time, baja AISI 4340 |
| Subjects: | T Technology > TJ Mechanical engineering and machinery |
| Divisions: | Fakultas Teknik > Program Studi Teknik Mesin |
| Depositing User: | 1421800124 Aldy Faiz Tachta Zany |
| Date Deposited: | 17 Jun 2026 06:50 |
| Last Modified: | 17 Jun 2026 06:50 |
| URI: | http://repository.untag-sby.ac.id/id/eprint/37614 |
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