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All Journal Jurnal Fisika Unand Jurnal Spektra Science and Technology Indonesia Jurnal Informatika Universitas Pamulang Jurnal Ilmu Fisika Jurnal Sistem Komputer & Kecerdasan Buatan Makara Journal of Technology IKRAM: Jurnal Ilmu Komputer Al Muslim Jurnal Ilmu Komputer
Abu Khalid Rivai
Pusat Sains dan Teknologi Bahan Maju, BATAN
Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Physics

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Journal : Makara Journal of Technology

 1 
High Temperature Corrosion of Aluminized AISI 4130 Steel with the Different Composition of NaCl/Na2SO4 Deposits Badaruddin, Mohammad; Wang, Chaur Jeng; Saputra, Yudhistyra; Rivai, Abu Khalid
Makara Journal of Technology Vol. 19, No. 2
Publisher : UI Scholars Hub

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The high temperature corrosion of AISI 4130 steel can be increased by hot-dip aluminizing coating. The aluminized steel specimens with the deposit composition of 100/0, 30/70, 50/50, 70/30, and 0/100 (wt.%) NaCl/Na2SO4 were oxidized at 750 °C for 1-49 h periods. According to a parabolic rate constant (kp) value, the aluminized steel with deposit composition of 70/30 NaCl/Na2SO4 shows the highest kp value (3.71 × 10-11 g2cm- 4s-1), later followed by the kp value of 3.35 × 10-11 g2cm-4s-1 for 100/0 and the lowest kp value is 7.731 × 10-12 g2cm-4s-1 for 0/100. Whereas, the kp value for the aluminized steel without NaCl/Na2SO4 deposit is around 2.23 × 10-13 g2cm-4s-1. The presence of both salts and their mixtures destroyed protective Al2O3 layer on the aluminized steel, leading to the Fe2O3 growth locally. Whereas, the penetration of sulfur into the Al2O3 scale lead to the formation of Al2S3 and FeS in the aluminide coating. Therefore, the kinetics rate was increased. Furthermore, mixtures of 70 wt. % NaCl in Na2SO4 depositing on the aluminized steel produced the highest parabolic rate constant because the aluminide layer on the steel substrate experienced severe corrosion attack, leading to fail in formation of protective Al2O3 layer.
Nano-Channels Early Formation Investigation on Stainless Steel 316Ti after Immersion in Molten Pb-Bi Rivai, Abu Khalid; Mardiyanto, Mardiyanto; Heinzel, Annette
Makara Journal of Technology Vol. 21, No. 1
Publisher : UI Scholars Hub

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Development of fuel cladding and structural materials in Pb-Bi environment, especially at high temperature, is a critical issue for the deployment of LFR (Lead alloy-cooled Fast Reactor) and ADS (Accelerator Driven Transmutation System). This is because of the corrosive characteristic of Pb-Bi to metals as constituent materials of fuel cladding and structural of the reactors. Corrosion test of a high-chromium austenitic stainless steel i.e. SS316Ti in molten Pb-Bi at 550 ºC has been carried out for about 300 hours continuously. The characterization using SEM-EDS (Scanning Electron Microscopy - Energy Dispersive X-ray Spectroscopy) showed that an iron oxide as the outer layer and a chromium oxide as the inner layer on the surface of the specimen were formed which in general have protected the steel specimen from corrosion and dissolution attack of Pb-Bi. However, small amount of Pb could penetrate into the iron oxide layer through ultra-narrow channels. Atomic Force Microscopy (AFM) with Electrostatic Force Microscopy (EFM) mode was employed to investigate the phenomena of the nano-channels early formation. The results of the nano-scale investigation showed clearly the formation of the channels at the early time of corrosion as the way of Pb to penetrate into iron oxide outer layer.
Microstructures and Hardness of TIG Welded Experimental 57Fe15Cr25Ni Steel Parikin, Parikin; Dani, Mohammad; Rivai, Abu Khalid; Ismoyo, Agus Hadi; Iskandar, Riza; Dimyati, Arbi
Makara Journal of Technology Vol. 22, No. 2
Publisher : UI Scholars Hub

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The microstructures and hardness of tungsten inert gas (TIG) welded experimental 57Fe15Cr25Ni steel were investigated through optical–scanning electron microscopy analyses and with a hardness tester, respectively. The welding process restructured the constituent atoms into regular and irregular crystal lattices. Rapid cooling of the weld metal allowed the formation of a dendritic (columnar) structure, with porous grains. By contrast, slow cooling influenced HAZ and led to the formation of grain structures. The crystal lattice became more organized and larger than other zones. Meanwhile, the base metal formed circular nets that covered large area inside thick and thin grain boundaries. The diffraction patterns revealed texturing in the weld metal. The crystallite orientation changed from (111) to (200) and (220) planes. The weld metal profile broadened (amorphous) and had full width at half maximum (fwhm) value larger than those in HAZ and the base metal. The weld metal possessed hardness of 121 HV, which is slightly lower than the hardness of the base metal (130 HV). HAZ exhibited the highest hardness value (152 HV). Hardening was influenced by carbon and outer oxygen migration to the grain boundaries, which formed colonies, i.e., chromium carbide, aluminum carbide, aluminum oxide, silicone oxide, and silicon carbide (precipitation hardening). Welding (heat) may change the microstructure and hardness of HAZ and the weld metal region, which would be brittle and very critical in responding to applied loads.
Co-Authors Agung Budi Susanto Agus Hadi Ismoyo Agusutrisno Agusutrisno, Agusutrisno Albert, Albert Setiawan Harijanto Anggai, Sajarwo Annette Heinzel Arbi Dimyati Bery, Winda Surya Chaur Jeng Wang, Chaur Jeng Dadang Kurnia, Dadang Dian Fitriyani Edi Suharyadi Elvaswer Elvaswer Evvy, Kartini Galih Putra Drantou Munggaran, Galih Putra Drantou Hadriani, Angelina Mardiansyah Mardiyanto Mardiyanto Mohammad Dani Nur Ika Puji Ayu Parikin Parikin Riza Iskandar Sudarno Sudarno Sulistioso G.S, Sulistioso Sulistioso Giat Sukaryo, Sulistioso Giat Tukiyat Yudhistyra Saputra, Yudhistyra Zain, Rafi Mahmud Zarvianti, Enny Zavianti, Enny