Ponyharsa, I Putu Hegard (2008) Karakteristik fracture toughness pada baja strenght AH36 akibat las-lasan melalui diversifikasi heat treatment. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pada penelitian ini dilakukan pengujian pada baja _high strength_ AH36 yang telah mengalami proses pengelasan, kemudian dilakukan proses perlakuan panas pasca pengelasan dengan variasi temperatur pemanasan dan ketebalan. Variasi ketebalan yang digunakan adalah 10 mm dan 20 mm. Pemanasan dilakukan dengan proses _tempering_, dengan variasi temperatur pemanasan yang digunakan adalah 450°C, 550°C, dan 650°C, kemudian temperatur ditahan selama enam puluh menit dan selanjutnya dilakukan pendinginan dengan udara. Penelitian ini ditujukan untuk mengetahui pengaruh temperatur dan ketebalan dalam proses perlakuan panas pasca pengelasan terhadap _fracture toughness_ dan sifat ketangguhan dengan menggunakan uji _impact Charpy_.
Dari hasil percobaan diketahui bahwa perlakuan panas dapat meningkatkan _fracture toughness_ dan kuat _impact_ pada sambungan las. Namun, pada beberapa daerah temperatur _temper_ dapat terjadi penurunan ketangguhan akibat terjadinya penggetasan _temper_ (_temper brittleness_). Pada perlakuan panas 650°C, terjadi penurunan ketangguhan pada sambungan las baja _high strength_ AH36 yang merupakan kondisi ketika material mengalami penggetasan (_temper brittleness_).
Nilai _fracture toughness_ tertinggi terdapat pada suhu pemanasan 550°C dengan tebal 20 mm, yaitu sebesar 25,97 kN·cm¹. Nilai kuat _impact_ tertinggi terdapat pada spesimen dengan perlakuan panas pada suhu 550°C, yaitu sebesar 2,238 J/mm² dengan ukuran spesimen 7,5 mm × 10 mm.
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This final project examines the fracture toughness of HTS AH36 after the welding process, in which post-weld heat treatment was conducted with variations in heating temperature and thickness. The thickness variations used were 10 mm and 20 mm. The heat treatment method used a tempering process with heating temperature variations of 450°C, 550°C, and 650°C, followed by air cooling. The holding time for each specimen was 60 minutes. This final project aims to determine the effect of temperature and thickness in post-weld heat treatment on fracture toughness, obtain the fracture toughness of the weld metal of HTS AH36, and determine the tendency of the effect of heat treatment on fracture toughness using the Charpy impact test.
According to the test results, higher heating temperatures can improve the impact strength of the weld metal. However, in certain tempering temperature ranges, toughness degradation can occur due to temper brittleness. At a heating temperature of 650°C, toughness degradation occurred in the HTS AH36 weld metal, indicating a condition in which the material experienced temper brittleness.
Heating the specimen to 550°C resulted in the highest fracture toughness value of 25.97 kN·cm¹ for the 20 mm-thick specimen and the highest impact strength value of 2.238 J/mm² for a specimen size of 7.5 mm × 10 mm.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | 620.112 6 Pon k |
| Uncontrolled Keywords: | Perlakuan panas, tempering, fracture toughness, baja strenght AH36, uji impact Charpy,kuatbnpact, Heat Treatment, tempering, fracture toughness, HTS AH36,impact charpy test, impact strenght |
| Subjects: | T Technology > TS Manufactures > TS227 Welding. |
| Divisions: | Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis |
| Depositing User: | magang . |
| Date Deposited: | 08 Oct 2026 02:19 |
| Last Modified: | 08 Oct 2026 02:19 |
| URI: | http://repository.its.ac.id/id/eprint/145421 |
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