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Syahbuddin Syahbuddin
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Journal : Makara Journal of Technology

 1 
Effect of Arc Plasma Sintering on the Structural and Microstructural Properties of Fe-Cr-Ni Austenitic Stainless Steels Parikin, Parikin; Dani, M.; Dimyati, A.; Purnamasari, N. D.; Sugeng, B.; Panitra, M.; Insani, A.; Priyanto, T. H.; Mustofa, S.; Syahbuddin, Syahbuddin; Huang, A.
Makara Journal of Technology Vol. 25, No. 2
Publisher : UI Scholars Hub

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X-ray diffraction techniques were performed to determine the actual crystal structure of A2 austenitic stainless steel (ASS) as-cast and A2 ASS after arc plasma sintering (APS) for 2 s. Computations were conducted on the basis of the Bragg arithmetic formula by comparing the S2 arithmetic with the interplanar spacing. The Bragg arithmetic formula is a simple series for the determination of the crystalline phase of materials based on the Miller indices of cubic shapes or other shapes. A2 ASS as-cast was identified to have a crystal structure of face-centered cubic with lattice parameter a = 3.58 Å. A similar crystal structure can still be detected in A2 ASS after APS for 2 s with lattice parameter a = 3.60 Å. This finding was confirmed by neutron diffraction measurements and optical–electron microscopy observations. Under the same conditions, both A2 ASS as-cast and A2 ASS after APS for 2 s have similar cast structures. The grain boundary formed in A2 ASS as-cast is thinner than that in A2 ASS after APS for 2 s, which is visible in its boundaries. Moreover, the grain structure of A2 ASS after APS for 2 s, which was originally elongated particles, became globular particles. Similarly, granular precipitates became concentrated and encompassed the steel matrix along the grain boundaries. Furthermore, scanning electron microscopy with energy-dispersive X-ray analysis showed that particles and islands in steel are distributed in the grains and at the grain boundaries, respectively. Precipitates are composed of C, Cr, Fe, and Ni. The elemental contents of Cr and C are dominant; thus, Cr23C6 precipitate is formed at the grain boundaries.
Effects of Plasma Sintering on the Post TIG Weld Joint of Fe-15Cr-25Ni Austenitic Stainless Steel Parikin, Parikin; Dani, Mohammad; Dimyati, Arbi; Insani, Andon; Deswita, Deswita; Aziz, Ferhat; Mardiyanto, Mardiyanto; Mustofa, Salim; Purwanto, Setyo; Adhika, Damar Rastri; Syahbuddin, Syahbuddin; Huang, Ching An
Makara Journal of Technology Vol. 26, No. 1
Publisher : UI Scholars Hub

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Arc-plasma sintering (APS) for 5 s has been applied to the post tungsten inert gas (TIG) weld joint of Fe–15Cr–25Ni austenitic stainless steel (ASS). The treatment is intended to observe the effect of heat generated by plasma on micro-crystal structures around the fusion zone (FZ), especially internal stress relief in steel after being subjected to welding. The effect of stress relief in weld was measured using the neutron diffraction technique. ASS that is predominantly composed of Fe, Cr, and Ni elements, with contents of 57%, 15%, and 25%wt. respectively, was cut into two parts. Both parts were then welded with TIG without filler with a current and voltage of 60 A and 50 V, respectively. After APS for 5 s, the sample was characterized and analyzed using high-resolution powder neutron diffractometer at a high-temperature laboratory facility. The results show that the tensile residual stress decreased with the APS heat input. The residual stresses significantly decreased from 82.40 MPa to 1.21 MPa in the FZ and continued almost evenly from 65.92 MPa to 1.24 MPa in the heat-affected zone (HAZ). The residual stress is a tensile stress that can reduce the mechanical strength of materials. This condition is also applicable to applied loads. A microstructure gives a confirmation that the C element migrates from the FZ to HAZ. The content was very high in dark traces. The C element reacts to Cr and O to form chromium carbide (Cr23C6) and chromium carbonyl (CrC6O6), respectively. It rapidly migrates among its grain boundaries. It may also weaken materials and probably initiate intergranular cracks.
Co-Authors A, Salimin A. Dimyati, A. A. Gafar Hidayat A. Insani Aji Digdoyo Andon Insani Angkit Sabekti Arbi Dimyati Arie Kurniawan Arifin, Sofyan Ashriany, Ratna Yulida Baiq Wahidah Bambang Pamungkas Betha Apreanda Bernadus Budi Briyatmoko Chichi, Chichi Damar Rastri Adhika Darma, Afif Arya Nugraha Deswita Deswita Dimas Permana Dyah Anggraini Edy Suparjan Elbi Wiseno Elsyami, Jihad Ferhat Aziz HANDAYANI, GEMY NASTITY hari Iswanto Hasrianto, Beni Hidayat Hidayat Huang, A. Huang, Ching An Johan Mahyudi Karsadi, Karsadi Kasim, Noval La Aba La Iru M. Dani Mahmudi Efendi Mardiyanto Mardiyanto Mattalatta, Wisra Mistriyani, Mistriyani Mohammad Dani Muh Yusuf Muh. Syahrul Qodri Murahim, Murahim Mustofa, S. Nani Kurniawati Natsir Abdullah Nerlin, Nerlin Noridhah Noridhah Nuranisa, Nuranisa Nurfiati, Nurfiati nursani, nursani P, Andi Syahrir Padaro, Wilna Dg. Panitra, M. Paridi, Khairul Parikin Parikin Priyanto, T. H. Purnamasari, N. D. Reni, Wa Ode Rosida P. Adam Rosnita Rosnita Rudy Yulianto Rusdiawan Rusdiawan Ruslin, Ruslin Sahumena, Muhamad Handoyo Salim Mustofa Setyo Purwanto Siti Rafiah Sitti Aminah Hamzah Karim Suaib, Fadila H. Sudika, I Nyoman Sugeng, B. Sugiarto S SYAFAR, A. MUHAMMAD Taslin, Sabri Tati Haryati Tri Surawan Yamin, La Ode Zahari Zen Zainuddin, Fatlina Zulyanti, Mutiara Zuriatin Zuriatin