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All Journal MACHINERY: Jurnal Teknologi Terapan Serambi Engineering
M. Rasid
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Control & Systems Engineering Earth & Planetary Sciences Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Pengaruh Variasi Pukulan terhadap Kekerasan Baja menggunakan Mesin Hammer Otomatis Kiki Qauri Valentino; M. Rasid; Dwi Arnoldi
Jurnal Serambi Engineering Vol. 10 No. 2 (2025): April 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

This study evaluates the effect of varying hammer strokes during the forging process using an automatic hammer machine on the hardness of ST 37 steel, ST 60 steel and automotive leaf springs. The experiments were carried out at a temperature of 600°C to analyse dimensional changes and material hardness resulting from plastic deformation. Data was obtained from thickness and hardness tests using the Vickers method. Variations in hammer strokes (0, 32 and 49 strokes) resulted in a significant increase in material hardness. For ST 37 steel the hardness increased from 137,964 kgf/mm² to 170,088 kgf/mm², for ST 60 steel from 158,781 kgf/mm² to 172,56 kgf/mm² and for automotive leaf springs from 198,442 kgf/mm² to 241,756 kgf/mm². This improvement is attributed to the strain hardening mechanism, which induces the accumulation of dislocations in the microstructure of the material, thereby increasing its resistance to further deformation. The variation in hammer strokes also influenced the changes in material thickness, with different levels of deformation depending on the mechanical properties of each material. ST 60 steel showed a more controlled deformation response compared to ST 37 steel, while automotive leaf springs showed greater deformation due to their more ductile nature. These results emphasise that forging process parameters, such as the number of hammer strokes, play a crucial role in enhancing the mechanical properties of materials to meet specific engineering application requirements.
ANALISA KEBOCORAN SAMBUNGAN LAS PIPA SANITARY SS 316L YANG DI RENDAM DALAM LARUTAN PH 4 Oktariady, Muhammad; M. Rasid; Ella Sundari
MACHINERY Jurnal Teknologi Terapan Vol. 6 No. 3 (2025): Machinery: Jurnal Teknologi Terapan
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.17505055

Abstract

The leak analysis test on the SS 316L sanitary pipe which was soaked in a pH 4 solution aims to determine the exact cause of the leak in the pipe. Pipes that are filled with acid with a pH of 4 will sometimes leak and according to the technician, the leak is caused by the acid in the pH 4 solution in the pipe. Therefore, this test is to confirm that the damage is caused by an acid with a pH of 4. It turns out that it is true that an acid with a pH of 4 can cause erosion of the pipe, which over time can cause the pipe to leak. This test uses a gravimetric test method which aims to find out how much weight the object erodes in 24 hours / 1440 minutes.
Co-Authors DWI ARNOLDI Ella Sundari Kiki Qauri Valentino Oktariady, Muhammad