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Utama, Dedi Pria
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Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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EFFECT OF HOT ROLLING AND SOLUTION TREATMENT ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF FE-MN-SI-CR-NI SHAPE MEMORY ALLOY Rohmah, Miftakhur -; Sendouw, Emmanoela Carissa; Tanjung, Rifqi Aulia; Utama, Dedi Pria; Mabruri, Efendi
Metalurgi Vol 38, No 2 (2023): Metalurgi Vol. 38 No. 2 2023
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/metalurgi.2023.708

Abstract

Fe-14Mn-4Si-8Ni-11Cr SMA (shape memory alloy) was designed as a smart material because of its specific properties, which can memorize the original shape, so it has the potential to dampen vibration in seismic structures. Memory effect is triggered by SIM (stress-induced martensitic) transformation from γ-austenite to ε-martensite (hexagonal close-packed / HCP) structure, and it is recovered by heating after unloading. This study investigated the effect of hot rolling and solution treatment on the microstructure and its relationship with hardness and SME (shape memory effect) properties. The as cast of Fe-14Mn-4Si-8Ni-11Cr was hot rolled (900 and 1000 ℃) and solution treated (1000 and 1100 ℃). After the thermomechanical process, all microstructures consist of γ-FCC (face-centered cubic), the annealing twins, and a fine band of ε-martensite. The grain size of the γ-phase is 29.43, 41.96, 42.44, and 45.57 μm for samples B, C, D, and E, respectively. The higher the temperature of hot rolling and solution treatment applied, the larger the grain size obtained, indirectly reducing the hardness to 299.93 BHN and 286.52 BHN for samples D and E. The coarsened austenite grain, a lower number of annealing twins, and the pre-existing line band of ε-martensite are favorable to obtain the enormous recovery strain, up to 8.26% for sample E.
EFFECT NICKEL AND QUENCH-TEMPER PROCESS ON MECHANICAL AND CORROSION PROPERTIES OF ASTM A588 WAETHERING STEEL Rohmah, Miftakhur -; Ramadhan, Gilang; Irawan, Dedi; Utama, Dedi Pria; Romijarso, Toni Bambang
Metalurgi Vol 37, No 3 (2022): Metalurgi Vol. 37 No. 3 Desember 2022
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2540.411 KB) | DOI: 10.14203/metalurgi.v37i3.630

Abstract

The mechanical improvement and "self-protection" properties are mainly needed to develop weather-resistant steel materials. In this study, A588 steel was given thermomechanical treatment (hot-rolling) followed by a quench-tempering process. The A588 is modified by adding 1, 2, and 3 wt% nickel to the primary alloy. Steel is made using a hot rolling process at 750 ℃ for 1 hour with 70% thickness reduction. The sample is heat-treated at 850 ℃ for 1 hour and quenched in water, oil, and open air. The tempering process is conducted at 400 ℃ for 30 minutes. Metallography test is confirmed final microstructural and compared with CCT simulation result. The fast cooling (water and oil quenchant) produces tempered martensite, ferrite, and pearlite, while the air-cooled forms a ferrite-pearlite. The cooling rate significantly affects strength and hardness and the nickel addition on hardness, and both factors have no significant on ductility. The sample owns the highest tensile strength value (~1226 MPa) with 1 %Ni, and the highest ductility value (around 17.1–27.43%) is obtained by air cooling. With 3% Ni, the corrosion rate decreases to 0072 mpy with -432.5 mV for corrosion potential and 0.12µA/cm-2 for current density. 
Pengaruh Perlakuan Termomekanik pada Paduan Titanium Ti-5Mo-9Nb Sutowo, Cahya; Rokhmanto, Fendy; Prasetyo, Agus Budi; Utama, Dedi Pria
Jurnal Inovasi Ilmu Pengetahuan dan Teknologi (JIPTEK) Vol. 7 No. 1 (2025): Jurnal Inovasi Ilmu Pengetahuan dan Teknologi (JIPTEK)
Publisher : Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Until now, more than 95% of the material needs for medical devices are still imported, independent mastery of technology can at least reduce dependence on imported implant materials. On the one hand, the increase in the welfare of the population in Indonesia today is directly proportional to the increase in life expectancy of the population. The above conditions will have an impact on the increase in the number of elderly people. The increase in the elderly population will potentially increase the occurrence of degenerative bone diseases suffered by the elderly. This study aims to analyze the effect of the thermomechanical process through hot rolling. The added Mo and Nb elements function as beta phase stabilizers which will certainly affect the microstructure and mechanical properties of titanium alloys. The thermomechanical heat treatment process is an advanced process where the homogenized ingot is then hot rolled at a temperature of 1100 °C in 3 rolling stages until it reaches a 50% reduction. Then characterized by observing the microstructure and mechanical properties. The thermomechanical process involves plastic deformation at high temperatures that affect changes in microstructure and mechanical properties. Plastic deformation combined with recrystallization results in smaller grain sizes, which improves mechanical properties with a relatively uniform increase of 429–450 VHN. Therefore, this thermomechanical processed Ti-5Mo-9Nb-based alloy has the potential for improved medical implant material applications. Abstrak: Sampai saat ini kebutuhan material untuk alat kesehatan lebih dari 95% masih impor, penguasaan teknologi secara mandiri setidaknya dapat mengurangi ketergantungan impor material implan. Di satu sisi, peningkatan kesejahteraan penduduk di Indonesia dewasa ini berbanding lurus dengan meningkatnya usia harapan hidup penduduk. Kondisi tersebut di atas akan berdampak terhadap peningkatan jumlah penduduk usia lanjut. Meningkatnya penduduk usia lanjut akan berpotensi pada terjadinya penyakit tulang degeneratif yang diderita oleh para lanjut usia akan semakin meningkat. Penelitian ini bertujuan untuk menganalisis pengaruh proses termomekanik melalui pengerolan panas. Unsur Mo dan Nb yang ditambahkan berfungsi sebagai penstabil fasa beta yang tentunya akan memengaruhi struktur mikro dan sifat mekanis paduan titanium. Proses perlakuan panas termomekanik merupakan proses lanjutan di mana ingot yang telah dihomogenisasi kemudian dilakukan pengerolan panas pada temperatur 1100 °C sebanyak 3 tahapan pengerolan sampai mencapai reduksi 50%. Kemudian dikarakterisasi melalui pengamatan struktur mikro dan sifat mekanik. Proses termomekanik melibatkan deformasi plastis pada suhu tinggi yang memengaruhi perubahan mikrostruktur dan sifat mekanis. Deformasi plastis yang dikombinasikan dengan rekristalisasi menyebabkan ukuran butir menjadi lebih kecil, yang meningkatkan sifat mekanis dengan peningkatan yang relatif seragam 429–450 VHN. Sehingga paduan berbasis Ti-5Mo-9Nb melalui proses termomekanik ini berpotensi untuk aplikasi material implan medis yang lebih baik.
Co-Authors Cahya Sutowo dedi irawan Gilang Ramadhan Mabruri, Efendi Prasetyo, Agus Budi Rohmah, Miftakhur - Rokhmanto, Fendy Romijarso, Toni Bambang Sendouw, Emmanoela Carissa Tanjung, Rifqi Aulia