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All Journal Jurnal Rekayasa Mesin Infotekmesin
Ilham Azmy
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Computer Science & IT Electrical & Electronics Engineering Mechanical Engineering

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Pengaruh Variasi Media Pendingin Proses Quenching Terhadap Mikrostruktur dan Sifat Mekanik Baja Hadfield Ilham Azmy
Infotekmesin Vol 13 No 2 (2022): Infotekmesin: Juli, 2022
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v13i2.1532

Abstract

Manganese steel contains 1,2% C and 12% Mn generally recognized as Hadfield steel. Based on the high composition of C and Mn elements, the main structure of this steel is dominated by an austenite matrix that surrounded the carbide phase on the grain boundary. This structure is usually brittle which leads to improper high-loading conditions. To overcome this problem, the experimental method was carried out by heating Hadfield steel to a temperature of 1000 oC, then followed by a quenching process using cooling media variations namely water and salt bath (20 wt.% NaCl solution). These cooling media variations aim to determine the level of carbide formation which affects the microstructure and mechanical properties. From the test results, it was obtained that Hadfield steel with salt bath (20 wt.% NaCl) quenching variation has significant microstructure transformation which affects enhancement of the value of tensile and yield strength (809,5 and 542,4 MPa), hardness (238 HV), ductility and toughness.
Effect of Magnesium Variation on Microstructure and Mechanical Properties of Aluminum Recycled Alloys Destri Muliastri; Mahir Ruardhian; Ilham Azmy
Jurnal Rekayasa Mesin Vol. 20 No. 3 (2025): Volume 20, Nomor 3, December 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i3.6664

Abstract

The use of recycled aluminum (scrap) as a lightweight material in the automotive industry continues to grow, especially through the addition of magnesium elements to improve mechanical properties. This study analyzes the effect of adding magnesium of 5 Wt% and 10 Wt% on the mechanical properties and microstructure of aluminum scrap melting results using the sand casting method at a temperature of 707°C. The test results show that the addition of magnesium increases the hardness from 39.4 HV to 94.6 HV, and the tensile strength from 49.5 MPa to 181.5 MPa. Microstructural analysis shows the formation of more Mg phases in the aluminum matrix, resulting in a stronger and more homogeneous structure. The addition of 10 Wt% magnesium gives the most optimal results, proving that recycled aluminum has great potential to be used as a high-value engineering material through an alloying process.
Co-Authors Destri Muliastri Mahir Ruardhian