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Utama, Dedi Pria
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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. 
Co-Authors dedi irawan Gilang Ramadhan Mabruri, Efendi Rohmah, Miftakhur - Romijarso, Toni Bambang Sendouw, Emmanoela Carissa Tanjung, Rifqi Aulia