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All Journal INTERNATIONAL JOURNAL OF MECHANICAL COMPUTATIONAL AND MANUFACTURING RESEARCH International Journal of Applied Mathematics, Sciences, and Technology for National Defense
Imastuti, Imastuti
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Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Mathematics Mechanical Engineering Physics

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Development of magnetic materials for cobalt titanium oxide using mechanical milling and the characterization methods Imastuti, Imastuti; Ari, Adi Wisnu; Mutmainnah, Mutmainnah; Putri, Haziza Elsa; Pratiwi, Raditya Faradina; Atmadi, Atmadi
International Journal of Applied Mathematics, Sciences, and Technology for National Defense Vol 1, No 2 (2023): International Journal of Applied Mathematics, Sciences, and Technology for Natio
Publisher : FoundAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/app.sci.def.v1i2.224

Abstract

In the synthesis of magnetic materials for absorbing radar waves, it is necessary to have a base material that has unique magnetic properties that can reach the broadband characteristics of radar frequencies. Cobalt titanium oxide is synthesized using mechanical milling. The phase formed by calcination at 1000℃ with a holding time of 5 hours. Sample characterization was carried out by XRD, VSM and VNA. Based on the research results, it was found that the material obtained had semiparamagnetic properties. From the SEM measurements, it is reactive to the sintering temperature. Radar wave absorption measured by VNA shows that cobalt titanium oxide shows a value with uniform absorption in the X-band wave.
Effect of Filler Metal Selection on Microstructure and Hardness of MIL-DTL 46100E Armor Steel Welded by Gas Metal Arc Welding (GMAW) Setiawan, Anang; Imastuti, Imastuti; Puspita, Maura Indah
International Journal of Mechanical Computational and Manufacturing Research Vol. 14 No. 2 (2025): August: Mechanical Computational And Manufacturing Research
Publisher : Trigin Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35335/computational.v14i2.272

Abstract

Welding is one of the manufacturing processes widely used in engineering fields such as vehicles, bridges, and others, including in the construction of combat vehicles (military) that have special materials with high hardness (Armor Steel). This study examines the effect of filler type on the welding process on the microstructure and hardness of MIL-DTL 46100E Armor Steel using the Gas Metal Arc Welding (GMAW) method. The fillers used were ER-110, ER-307, and ER-70S.  The tests were carried out using metallographic analysis to study microstructural changes in the Weld Metal (WM) and HAZ areas and Vickers hardness testing. Macro testing results showed that the ER-307 filler produced a wider weld zone, while ER-70S produced a narrower weld zone. Microstructure testing revealed that ER-307 produced a finer and more stable structure, with a predominance of pearlite and ferrite phases in the Weld Metal and martensite in the HAZ. Hardness test results show that ER-307 has the highest hardness in the WM area at 411.9 HV and in the HAZ (501.6 HV), followed by the lowest hardness produced by the ER-70S filler at 297.5 HV and an HAZ value of 500 HV. Overall, ER-307 demonstrated the best performance for welding MIL-DTL 46100E steel, with stable hardness and optimal microstructure throughout the weld zone. This study provides guidance in selecting filler for welding armor steel, which can be applied to the development of combat vehicle technology.
Co-Authors Anang Setiawan Ari, Adi Wisnu Atmadi, Atmadi Mutmainnah Mutmainnah Pratiwi, Raditya Faradina Puspita, Maura Indah Putri, Haziza Elsa