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Parikin Parikin, Research Center for Nuclear Reactor Technology, Nuclear Energy Research Organization, National Research and Innovation Agency, Puspiptek Area, Banten 15314, IndonesiaFollow
Mohammad Dani, Research Center for Nuclear Reactor Technology, Nuclear Energy Research Organization, National Research and Innovation Agency, Puspiptek Area, Banten 15314, Indonesia
Arbi Dimyati, Research Center for Nuclear Reactor Technology, Nuclear Energy Research Organization, National Research and Innovation Agency, Puspiptek Area, Banten 15314, Indonesia
Andon Insani, Research Center for Radiation Detection Technology and Nuclear Analysis, Nuclear Energy Research Organization, National Research and Innovation Agency, Puspiptek Area, Banten 15314, Indonesia
Deswita Deswita, Research Center for Radiation Detection Technology and Nuclear Analysis, Nuclear Energy Research Organization, National Research and Innovation Agency, Puspiptek Area, Banten 15314, Indonesia
Ferhat Aziz, Research Center for Nuclear Reactor Technology, Nuclear Energy Research Organization, National Research and Innovation Agency, Puspiptek Area, Banten 15314, Indonesia
Mardiyanto Mardiyanto, Research Center for Nuclear Reactor Technology, Nuclear Energy Research Organization, National Research and Innovation Agency, Puspiptek Area, Banten 15314, Indonesia
Salim Mustofa, Directorate of Research and Innovation Infrastructure Strengthening and Partnership, Deputy for Research and Innovation Infrastructure, National Research and Innovation Agency, Jakarta 10340, Indonesia
Setyo Purwanto, Research Center for Advanced Materials, Nanotechnology and Materials Research Organization, National Research and Innovation Agency, Puspiptek Area, Banten 15314, Indonesia
Damar Rastri Adhika, Research Center for Nanosciences and Nanotechnology, Institut Teknologi Bandung, Bandung 40132, Indonesia
Syahbuddin Syahbuddin, Department of Mechanical Engineering, Faculty of Engineering, Universitas Pancasila, Srengseng Sawah, Jakarta 12640, Indonesia
Ching An Huang, Department of Mechanical Engineering, Chang Gung University, Taoyuan 33302, Taiwan

Abstract

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.

Bahasa Abstract

Pengaruh Sintering Arc-Plasma pada Sambungan Baja Tahan Karat Austenitik Fe–15Cr–25Ni Pasca Las TIG. Sintering arc-plasma selama 5 detik telah diterapkan pada sambungan las tungsten inert gas (TIG) pada baja tahan karat austenitik Fe–15Cr–25Ni. Perlakuan ini dimaksudkan untuk mengamati pengaruh panas yang ditimbulkan oleh plasma pada struktur kristal mikro di sekitar zona fusi, terutama pelepasan tegangan internal pada baja setelah pengelasan TIG. Pengaruh pengurangan stres setelah perlakuan panas plasma pasca-sinter diukur dengan menggunakan teknik difraksi neutron. Baja tahan karat Austenitik yang didominasi unsur Fe, Cr dan Ni dengan kandungan 57%, 15% dan 25%wt. masing-masing dipotong menjadi dua. Kedua bagian tersebut kemudian dilas dengan TIG tanpa filler dengan arus 60 Ampere dan tegangan 50 volt. Setelah disinter dengan plasma arc selama 5 detik, sampel dikarakterisasi dan dianalisis menggunakan difraktometer neutron serbuk resolusi tinggi (HRPD), SEM dan TEM di fasilitas laboratorium suhu tinggi. Hasil percobaan menunjukkan bahwa tegangan sisa tarik menurun dengan masukan panas sintering plasma busur. Tegangan sisa menurun secara signifikan dari sekitar 82,40 MPa menjadi 1,21 MPa di zona fusi dan berlanjut hampir merata di zona yang terkena panas sekitar 65,92 MPa menjadi 1,24 MPa. Tegangan sisa merupakan tegangan tarik yang dapat menurunkan kekuatan mekanik material karena meningkatkan beban yang diterapkan. Mikrostruktur memberikan konfirmasi pengamatan. Elemen C bermigrasi dari fusi ke zona yang terpengaruh panas dan sangat tinggi di jalur gelap. Elemen C bereaksi dengan Cr dan O membentuk kromium karbida; Cr23C6 dan kromium karbonil; CrC6O6 masing-masing. Senyawa ini dapat dengan cepat bermigrasi di antara batas butir, sehingga dapat melemahkan bahan, bahkan boleh jadi memicu retakan intergranular.

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