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STRUKTUR MIKRO DAN KARAKTERISTIK MEKANIK PEB U3Si2-AI TMU 2,96 g/cm3 DAN PASCA PERLAKUAN PANAS SUHU 500°C Maman Kartaman A.; Yusuf Nampira; Junaedi Junaedi; Sri Ismarwanti
Jurnal Forum Nuklir JFN Vol 7 No 2 November 2013
Publisher : BATAN

STRUKTUR MIKRO DAN KARAKTERISTIK MEKANIK PEB U3Si2-AI TMU 2,96 g/cm3 PASCA PERLAKUAN PANAS SUHU 500°C. Telah dilakukan karakterisasi struktur mikro dan kekerasan terhadap PEB U3Si2-Al TMU 2,96 g/cm3 yang dikenakan perlakuan panas pada suhu 500°C selama 1, 3, 5 dan 7 jam. Pengamatan struktur mikro dilakukan menggunakan mikroskop optik dan SEM serta pengujian kekerasan terhadap baban kelongsong PEB U3Si2-Al menggunakan alat kekerasan makro vickers pada beban 2 Kgf. Mikrograf yang dihasilkan memiliki kualitas cukup baik yaitu bersih dari endapan pengotor baik pada kelongsong maupun inti elemen bakar bakar nuklir dan goresan amplas relatif sedikit sehingga interpretasi atau analisis hasil struktur mikro dapat dilakukan secara benar. Struktur mikro PEB U3Si2/Al kondisi aspolished memperlihatkan adanya deformasi plastis pada bagian tepi akibat pemotongan sedangkan pada bagian inti elemen bakar tidak ada perubahan signifikan. Dispersan U3Si2 memiliki bentuk tidak beraturan dengan ukuran bervariasi dari (21,2-115) µm dan tersebar relatif merata pada matrik Al. Pada dispersan teramati retakan mikro dan kenaikan waktu pemanasan tidak menyebabkan pembesaran retakan tersebut. Pengamatan struktur mikro PEB U3Si2-Al pada bagian kelongsong yang telah di etsa menunjukkan adanya perubahan ukuran butir. Semakin lama waktu pemanasan maka ukuran butir relatif semakin membesar dan berdampak pada menurunnya nilai kekerasan kelongsong AlMg2 . Hasil uji kekerasan PEB U3Si2-Al yang telah diberi perlakuan panas pada suhu 500°C selama 0, 1, 3, 5 dan 7 jam berturut-turut 44,62 HV, 34,05 HV, 34,05 HV, 31,47 HV dan 32,07 HV.

PERILAKU TARIK DAN STRUKTUR MIKRO BAJA TAHAN KARAT AISI 304 PASCA PERLAKUAN PANAS PADA DAERAH SENSITISASI 600 – 700 °C Sungkono Sungkono; Sri Ismarwanti
Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol 27, No 3 (2021): Oktober, 2021
Publisher : website

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2021.27.3.6570

PERILAKU TARIK DAN STRUKTUR MIKRO BAJA TAHAN KARAT AISI 304 PASCA PERLAKUAN PANAS PADA DAERAH SENSITISASI 600 – 700 °C. Baja tahan karat AISI 304 digunakan sebagai komponen struktur reaktor daya tipe LWR. Dalam pembuatan komponen struktur, kualitas sambungan lasan SS 304 ditentukan oleh proses pendinginan dari temperatur austenit ke sensitisasi. Tujuan penelitian adalah mengetahui karakter kekuatan tarik, kekerasan dan struktur mikro SS 304 pada daerah sensitisasi 600-700 °C. Metoda penelitian yang digunakan adalah pengujian komposisi kimia, tarik, kekerasan, dan struktur mikro yang mengacu pada ASTM. Hasil penelitian menunjukkan bahwa kekuatan tarik SS 304 pasca perlakuan sensitisasi pada (600 °C, 30- 60 menit) dan (700 °C, 30-90 menit) relatif sama dan lebih rendah dibandingkan tanpa perlakuan panas, sedangkan pada (600 °C, 90 menit) relatif sama dengan sampel tanpa perlakuan panas. Struktur mikro SS 304 terdiri atas fasa ferit-d dan austenit serta presipitat khrom karbida. Kuantitas presipitat di batas butir menurun dengan bertambahnya temperatur dan waktu penahanan. Kekerasan pasca perlakuan sensitisasi pada 600 - 700°C relatif sama di base metal, dekat patahan dan daerah patahan. Ketangguhan retak terbaik diperoleh pada sampel SS 304 dengan perlakuan (700 °C, 90 menit).Kata kunci: baja tahan karat, sensitisasi, kekuatan tarik, kekerasan, struktur mikro, presipitat.

KARAKTERISASI MIKROSTRUKTUR, KEKERASAN, KOMPOSISI KIMIA DAN STRUKTUR KRISTAL LAPISAN PADA PERMUKAAN BAJA Sungkono; Maman Kartaman Ajiriyanto; Sri Ismarwanti; Rohmad Sigit
Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol. 25 No. 3 (2019): Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir
Publisher : Badan Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2019.25.3.5708

Steel and alloys are used as structural material for nuclear reactor components and supporting equipments of hot cells. During the operation of nuclear reactors or hot cell facilities, structural materials suffer from tensile, compressive, and frictional stresses in high radiation environments and thus reduce the life time of the components. One solution for this issue is surface coating of steel with materials having high hardness, corrosion and wear resistance. The aim of this research is to obtain the characteristics of microstructure, thickness, hardness, chemical composition and crystal structure of layers on steel surface. The method used was observation with optical microscope for microstructure, vickers microhardness tester for hardness, spark spectrometry for chemical composition and X-ray diffractometry for crystal structure. The results shows that the base metal microstructure consists of fine equiaxial grains with ferrite and pearlite phases, where the metal-layer interface is clearly visible, and the compact and homogeneous layer has an average thickness of 624.071 µm. The hardness of the layer is 943 VHN. From the chemical composition it is identified that the base metal is S45C carbon steel, and the surface layer is a stable compound of chromium oxide (Cr2O3) with hexagonal crystal structure.

KARAKTERISTIK MEKANIK KELONGSONG BAHAN BAKAR NUKLIR TEMPERATUR TINGGI DALAM ATMOSFER GAS NITROGEN Rohmad Sigit; Sri Ismarwanti; Guswardani; Yatno Dwi Agus Susanto; Jan Setiawan
Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol. 24 No. 2 (2018): Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir
Publisher : Badan Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2018.24.2.4422

At Loss of Cooling Accident (LOCA) scenario, Zr-2 and Zr-4 as nuclear fuel cladding potentially exposed to air which experimentally leads to mechanical properties degradation faster than in steam environment. This study aims to determine the impact of nitrogen on the mechanical strength of cladding by minimizing other environmental influences. The Zr-2 and Zr-4 cladding was annealed under vacuum at a temperature of 500°C for one hour. It was followed by nitriding with the pressure of 1500 mbar for two hours. It was followed by natural cooling to room temperature. The results of tensile strength and microhardness testing showed that tensile strength, ductility and microhardness values increase of 12.1%, 19.2% and 28.2% for Zr-2 and 5.1%, 25% and 22.6% for Zr-4, respectively. Nitride layer was formed on the cladding surface due to interaction with nitrogen and there is no mechanical properties degradation due to nitriding process. It was caused by nitriding processes that were not followed or accompanied by oxidation processes.

PERILAKU TARIK DAN STRUKTUR MIKRO BAJA TAHAN KARAT AISI 304 PASCA PERLAKUAN PANAS PADA DAERAH SENSITISASI 600 – 700 °C Sungkono; Sri Ismarwanti
Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol. 27 No. 3 (2021): Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir
Publisher : Badan Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2021.27.3.6570

AISI 304 stainless steel is used as a structural component of the LWR type power reactors. In the manufacture of structural component, the quality of SS 304 welded joints is determined by cooling process from the austenite to sensitization temperature. The purposes of this study were to determine tensile strength, hardness and microstructure of SS 304 in the sensitization area of 600 – 700 °C. The research method was testing of the chemical composition, tensile, hardness and microstructural properties referring to ASTM. The results show that the tensile strength of SS 304 after sensitization treatment at 600 °C (30-60 minutes) and 700 °C (30-90 minutes) was relatively the same and lower than samples without heat treatment while the sample treated at 600 °C (90 minutes) was relatively the same as the sample without heat treatment. The microstructure of SS 304 consists of d-ferrite and austenite phases and chromium carbide precipitates. The quantity of precipitate at the grain boundaries decreases with increasing temperature and holding time. The hardness after sensitization treatment at 600 – 700 °C was relatively the same on the base metal, near the fracture and the fracture area. The most crack resistant was obtained on SS 304 samples with treatment at 700 °C (90 minutes).

ANALISIS KETIDAKPASTIAN PENGUKURAN KEKUATAN TARIK DAN ELONGASI SPESIMEN SS304 BERBENTUK RING Sri Ismarwanti; Jan Setiawan; Maman Kartaman Ajiriyanto; Rohmad Sigit
Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol. 27 No. 3 (2021): Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir
Publisher : Badan Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2021.27.3.6567

Uncertainty is a measure of the reliability of a measurement. One of the widely used uncertainty analysis approaches is the Guide to the expression of uncertainty in measurement (GUM). The steps for analyzing the uncertainty of a measurement have been described in detail by the GUM approach. Uncertainty analysis was carried out on tensile testing to determine the traceability of the data obtained. Tensile testing produces data in the form of tensile strength and elongation of the test material. Tensile strength is a quantity that involves the magnitude of the force and length. Elongation is the increase in length when pulling. The tensile strength of the ring-shaped sample will be affected by the cross-sectional area on both sides of the ring when a tensile stress is applied. So, to determine the uncertainty of the tensile test, an analysis of the contributors to the uncertainty is required. This paper provides an explanation of how to analyze the uncertainty of the measurement of tensile strength and elongation in a ring-shaped sample. In addition, the value of the uncertainty in the measurement of tensile strength and elongation of SS304 (in the form of a ring) will also be presented. The test results show that the average tensile strength of SS304 rings is 631.070 ± 26.976 Nmm-2 with an expanded uncertainty of 50.451 Nmm-2 at a 95% confidence level. In addition, at the same level of confidence, the average SS304 ring elongation result is 18.681% ± 2.425% with an expanded uncertainty of 2.867%. Data repetition or repeatability is the biggest contributor to the uncertainty in measuring the tensile strength and elongation of the SS304 ring.

PENGARUH MEDIA PENDINGIN TERHADAP KARAKTERISTIK MEKANIK DAN STRUKTUR MIKRO PADA PELAT BAJA KARBON RENDAH Iskandarsyah Wicaksono; Sri Ismarwanti; Jan Setiawan; Ferry Budhi Susetyo; Syamsuir
Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol. 27 No. 1 (2021): Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir
Publisher : Badan Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/urania.2021.27.1.6187

Low carbon steel has high ductility and is easy to shape, so it is widely used in industry and construction. However, this material has low mechanical strength and hardness, so it is easy to wear. Mechanical properties can be improved by heat treatment, namely heating at a specific temperature and holding it for some time and then cooling. Cooling media will affect the level of enhancement in its mechanical properties. Therefore, in this study, observations were done on the mechanical characteristics and microstructure of low carbon steel after heat treatment and cooling on various cooling media. The heating process was carried out at a temperature of 950 °C with a holding time of 15 minutes. The sample is then cooled with a variety of coolants (aqua dest, cooking oil, oil and open-door furnace). The results of the observations on samples of low carbon steel plates (0.0524%) shows that the sample without heat treatment has the highest stress value of 375.75 MPa and the open furnace door cooling has the lowest stress value of 200.53 MPa. The highest strain value occurred in the open-door cooling of 38.77% and the lowest strain value of 25.49% occurred in the cooling with cooking oil. Observation on the material's microstructure before and after heat treatment shows ferrite and pearlite.

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