Jamhar, Achirul (2021) Pengaruh Variasi Lama Waktu Penembakan Pada Proses Shot Peening Terhadap Kekerasan dan Laju Korosi Sambungan Las SMAW Pipa ASTM A106 Gr. B. Sarjana thesis, Universitas Brawijaya.
Abstract
Peran penting dari minyak mentah untuk kebutuhan bahan bakar meningkatkan permintaan dari minyak mentah, sehingga meningkatkan laju istribusi minyak mentah dari sumur pengeboran menuju ke kilang yang dihubungkan dengan sistem pemipaan. Dalam sistem pemipaan, penambahan sambungan las SMAW banyak dipilih untuk menyambungkan pipa-pipanya. Dengan adanya proses pengelasan dapat menimbulkan tegangan sisa tarik yang memungkinkan terjadinya kegagalan pada material ketika berada pada lingkungan yang bersifat korosif. Untuk menghilangkan atau mengurangi tegangan sisa tarik akibat pengelasan, diberikan proses shot peening untuk meningkatkan kekerasan dan ketahanan korosi dari material. Proses shot peening dilakukan pada daerah HAZ dengan bola baja berdiameter 3 mm, tekanan 8 bar, jarak penembakan 6 cm, dan dengan memvariasikan lama waktu penembakan yaitu: 6 menit;8 menit;10 menit,12 menit;dan 14 menit. Pengujian kekerasan menggunakan alat microvickers dengan jarak 0,3mm;0,5mm;dan 0,7mm dari permukaan spesimen dan laju korosi diuji dengan alat potensiostat/ galvanostat/ impedance analyze (PalmSens). Data pendukung berupa foto makro yang digunakan dalam penelitian ini. Hasil dari penelitian ini menunjukkan bahwa semakin lama waktu penembakan maka nilai kekerasannya semakin meningkat dan nilai laju korosinya semakin menurun.
English Abstract
This research was carried out with the aim of finding the influence of shot peening time in the shot peening process and the most effective shot peening time for the hardness tested with Eseway EW-410AAT and corrosion rate tested with PalmsSens on SMAW welded joints of ASTM A106 Gr. B pipes with the electrolyte used is crude oil. The shot peening process is carried out in the HAZ (Heat Affected Zone) area because it is the welding area that is most susceptible to corrosion. The justification for this research was done by comparing the results of macroscopic photos using a digital microscope and SEM (Scanning Electron Microscope) photos using a Hitachi TM3000 Scanning electron microscope. The results showed that the longer the shot peening time in the shot peening process could increase the hardness of the HAZ region on the specimen with produced compressive residual stress and could reduce the corrosion rate of the specimen because there is an increase in grain density from the surface of the specimen exposed to the shot peening process so that it becomes a protective layer for the layer inside which is more resistant to corrosion. However, in testing the corrosion rate, it was found that the most effective shot peening time was 12 minutes. Macroscopic and SEM photos in this study can also be used as supporting data.
Other obstract
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| Item Type: | Thesis (Sarjana) |
|---|---|
| Identification Number: | 621.8 |
| Uncontrolled Keywords: | Shot peening time, Kekerasan, Laju korosi, ASTM A106 Gr. B-- Shot peening time, Hardness, Corrosion Rate. |
| Subjects: | 600 Technology (Applied sciences) > 621 Applied physics > 621.8 Machine engineering |
| Divisions: | Fakultas Teknik > Teknik Mesin |
| Depositing User: | Unnamed user with email gaby |
| Date Deposited: | 19 Oct 2021 06:28 |
| Last Modified: | 22 Feb 2022 07:13 |
| URI: | http://repository.ub.ac.id/id/eprint/184031 |
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Text (DALAM MASA EMBARGO)
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