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PENGARUH PERLAKUAN PANAS ANNEALING TERHADAP UJI FATIK PUNTIR PADA BAJA ST 41 DENGAN VARIASI SUDUT PUNTIR 4°, 5° DAN 6°

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Technological developments that have undergone progress have increasingly triggered people's mindsets to improve the quality of these modern tools to be more sophisticated. Especially tools that use metal materials and have good mechanical properties. ST 41 steel is a type of low carbon steel that is widely used in machine components because it combines strength, toughness, and affordability. However, in real-world applications, machine components often experience repeated dynamic loads that can cause fatigue failure. Therefore, research on the effect of heat treatment on the torsional fatigue resistance of ST 41 steel is important to understand changes in its mechanical properties. This study aims to determine the effect of annealing heat treatment on the fatigue life of ST 41 steel with twist angles of 4°, 5°, and 6°. Annealing heat treatment was carried out at a temperature of 875°C with a holding time of 60 minutes, then slowly cooled in the furnace. Testing was carried out using a Repeated Torsion and Bending Fatigue machine in accordance with the JIS Z 2273 standard. In addition, tensile testing was carried out to determine changes in tensile strength and material ductility due to heat treatment. The results of the study show that annealing heat treatment on ST 41 steel increases ductility, as seen from the elongation value in the tensile test, but does not provide a significant increase in torsion fatigue life. In fatigue testing, the number of fracture cycles decreased as the torsion angle increased. At an angle of 4°, the non-annealed (NHT) spesimen showed the best fatigue life with the highest number of cycles at 129,550, while at an angle of 5° the highest number of cycles dropped to 23,450, and at an angle of 6° it only reached 13,600. In the annealed (HT) spesimens, the same pattern emerged, with the 4° angle having the highest number of cycles at 45,050, while the 5° angle decreased to 20,400, and the 6° angle only reached 13,200. This shows that the twist angle is the dominant factor determining fatigue life; the greater the loading angle, the faster the material fails. Based on data analysis, annealing heat treatment does not consistently increase the fatigue resistance of ST 41 steel, and variations in the twist angle have a much greater effect on the fatigue life of the material.

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Detail Information

Series Title

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Call Number

T1894482025

Publisher

Indralaya : Prodi Teknik Mesin, Fakultas Teknik Universitas Sriwijaya., 2025

Collation

xvii, 75 hlm.; ilus.; tab.; 29 cm

Language

Indonesia

ISBN/ISSN

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Classification

620.112 607

Content Type

Text

Media Type

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Carrier Type

-

Edition

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Subject(s)

Prodi Teknik Mesin
Sudut Puntir

Specific Detail Info

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Statement of Responsibility

MI

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