PENGARUH PERLAKUAN PANAS AUSTEMPERING PADA BAJA AISI 1040 TERHADAP SIFAT MEKANIK DAN STRUKTUR MIKRO

Resa, Putra Setiawan (2026) PENGARUH PERLAKUAN PANAS AUSTEMPERING PADA BAJA AISI 1040 TERHADAP SIFAT MEKANIK DAN STRUKTUR MIKRO. S-1 thesis, 021008 Universitas Tridinanti.

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Abstract

The objective of this study was to investigate the effect of austenitizing heat treatments at various constant temperatures on the hardness and microstructure of AISI 1040 steel. Samples were first austenitized at 850°C for 15 minutes, followed by treatment in a salt bath at 250°C, 300°C, and 350°C for 10 minutes at each stage. Microstructures were examined using a metallographic microscope, and hardness was measured at five locations on each sample using the Rockwell B (HRB) scale. Untreated samples served as a reference. Test results indicated that the average hardness of the untreated samples was 80.8 HRB. After hardening, hardness increased to 86.2 HRB at 250°C, 85.7 HRB at 300°C, and 82.1 HRB at 350°C, with the maximum hardness achieved at 250°C. As the temperature increased from 250°C to 350°C, hardness tended to decrease. Microstructural analysis revealed the presence of ferrite and pearlite in the untreated samples, whereas structural changes indicating a bainite transformation were observed in the hardened samples. Therefore, temperature variations influence the hardness and microstructure of AISI 1040 steel. Keywords: AISI 1040, austempering, isothermal temperature, hardness, microstructure, bainite.

Item Type: Thesis (S-1)
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Fakultas Teknik > S1 Teknik Mesin
Depositing User: Tn RESA PUTRA SETIAWAN
Date Deposited: 17 Oct 2026 01:25
Last Modified: 17 Oct 2026 01:25
URI: http://repository.univ-tridinanti.ac.id/id/eprint/11557

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