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All Journal JMPM (Jurnal Material dan Proses Manufaktur) International Journal of Innovation in Mechanical Engineering and Advanced Materials
Usman Sudjadi
Universitas Mercu Buana
Automotive Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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Studi Perbandingan tentang Sifat Mekanik dan Struktur Mikro Material Radiator Impor dan Material Radiator Lokal Rahmad Rahmad; Usman Sudjadi
JMPM (Jurnal Material dan Proses Manufaktur) Vol 5, No 1 (2021): Juni
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jmpm.v5i1.12040

Abstract

Pengujian pada studi ini menggunakan sampel core radiator impor dan core radiator lokal. Metode pengujian dilakukan dengan tiga tahapan yaitu sebelum heat treatment, sesudah heat treatment, dan uji korosi dengan direndam cairan yang berbeda yaitu H2SO4, NAOH, dan cairan radiator selama 15 hari. Sebelum heat treatment, dilakukan uji komposisi kimia semua sampel radiator dengan alat XRF, uji struktur mikro dengan mikroskop optik pembesaran 500x, dan uji kekerasan micro-vickers dengan beban 100gf dalam waktu 10 detik. Heat treatment dilakukan dengan suhu 850oc dalam waktu 3 jam, kemudian direndam dengan cairan kimia selama 15 hari. Dari pengujian tersebut didapat hasil uji struktur mikro baik sebelum maupun sesudah heat treatment pada kedua sampel radiator tidak terlihat kumpulan atom, matrix dan batas butirnya. Uji kekerasan pada sampel core radiator Mercedez sebelum dipanaskan sebesar 43,4 HV dan 39,2 HV sesudah heat treatment. Pada core radiator lokal, sebelum dipanaskan sebesar43,5 HV dan 38,2 HV sesudah dipanaskan. Hasil uji komposisi kimia menunjukan pada sampel core Mercedez didominasi unsur Ca, Mn, dan Fe dan pada sampel core radiator lokal didominasi unsur Ca, Cu dan Zn. Hasil pengamatan dan analisa setelah direndam cairan H2S04, NAOH, dan cairan radiator pada kedua sampel menunjukkan terjadinya perubahan warna karena adanya perubahan unsur akibat peningkatan konsentrasi atom.
MECHANICAL STUDY OF 9CR-SS316L-1MO MATERIAL FOR CLADDING NUCLEAR FUEL POWER REACTORS Mayda Purnama; Usman Sudjadi
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol. 4 No. 2 (2022)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v4i2.16832

Abstract

In this research, SS316 steel and modified 9Cr-1Mo steel were developed. The aim is to analyze the results of the hardness test, impact test, bending test, and microstructure. The Mo element was chosen because it has a relatively small microscopic cross-section of the neutron, which is 2.6 barn. The element Mo is in the same periodic period as Zr and Nb, so that the mechanical properties and so on are not much different. In this study, samples of SS316L steel and modified 9Cr-1Mo steel were made. Samples material of 90% SS316L + 9% Cr + 1% Mo were melted by electric arc melting. Tempering was carried out after the smelting process was completed. The sample consisted of 6 pieces, 1 sample did not receive tempering treatment while the other 5 samples received tempering treatment at 100°C, 200°C, 300°C, 400°C, and 500°C. The samples were tested using various methods including Rockwell hardness test, impact test, microstructure test, bending test, and examination of other properties of the material samples. Hardness, impact, and bending test results as well as the samples microstructure were analyzed. The highest decrease in hardness value was in specimen 1 (non-treatment) which was 21.33 HRc and the lowest decrease was in specimen 6 (heat treatment at 500°C) which was 16.66 HRc. For the results of the impact energy test (EI) with an average value, there was not too much difference, namely the highest value was 1.0034 joules/mm2 in specimen 2 (heat treatment at 100°C) and the lowest value was 1.0020 joules/mm2 in specimen 6 (heat treatment at 500°C). The results of the microstructure test showed that the ferrite and pearlite content is still present in the test object. The highest bending test result in sample 6 with 500°C tempering had a maximum load-bearing strength of 1050 Newton so that the bending strength was 7875 kgf/cm2 and the lowest result was in sample 1 without tempering having a maximum load-bearing strength of 670 Newton so that the bending strength was 5025 kgf/ cm2
Co-Authors Mayda Purnama Rahmad Rahmad