Pengaruh Proses Pendinginan Solution Treatment pada Material Zircaloy-4 terhadap Struktur Mikro, Sifat Mekanik, dan Ketahanan Korosi Temperatur Tinggi

Ramadhani, Muhammad Rafly (2024) Pengaruh Proses Pendinginan Solution Treatment pada Material Zircaloy-4 terhadap Struktur Mikro, Sifat Mekanik, dan Ketahanan Korosi Temperatur Tinggi. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Proses pemilihan material cladding yang digunakan pada industri nuklir harus sesuai dengan standar untuk menjamin keselamatan kerja. Zirconium alloys atau zircaloy adalah salah satu material yang umum digunakan dalam cladding. Material ini dipilih dikarenakan telah memenuhi berbagai kriteria seleksi yang ada seperti nilai neutron cross section yang kecil dan juga ketahanan korosi yang bagus. Penelitian ini bertujuan untuk menganalisis pengaruh metode quenching dan juga media pendingin dalam proses β-heat treatment terhadap zircaloy-4. Spesimen dipanaskan hingga temperatur transformasi β lalu dilakukan metode quench berupa direct-quench, step-quench, dan up-quench pada media air dan oli. Diamati bahwa semakin cepat laju pendinginan, semakin banyak fasa β-Zr yang bertransformasi, dan grain berbentuk jarum berukuran kecil terbentuk. Sifat mekanik diuji menggunakan metode Hardness Vickers dengan hasil kekerasan tertinggi ditunjukkan oleh direct quench water dengan hasil 282.58±4.124 VHN. Proses korosi temperatur tinggi dilakukan pada 400°C dan 500°C selama 24 jam dengan pengujian TGA pada 500℃ selama 30 menit. Hasil korosi adalah spesimen as received memiliki permukaan hitam dengan adanya nodul, mengindikasi oksida ZrO2 terbentuk. Sedangkan pada spesimen perlakuan panas, oksida ZrO2 bertransformasi dari warna hitam menuju putih. Hal tersebut disebabkan oleh proses β-transformasi yang terjadi selama proses quenching dan dikombinasikan dengan oksidasi berkelanjutan. Efek tersebut terlihat lebih jelas pada temperatur 500℃. Hasil TGA dengan laju penambahan berat terendah adalah spesimen up quench water dengan nilai laju 2.234 gr/m2/jam.
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The process of selecting cladding materials used in the nuclear industry must comply with standards to ensure work safety. Zirconium alloys or zircaloy is one of the materials used in cladding. It was chosen because it meets various selection criteria, such as its small thermal neutron cross-section value and its corrosion resistance. This study aims to analyze the influence of quenching method and media in β-heat treatment process of zircaloy-4 material. The specimens were heated until β transformation temperature and then quenched with direct-quench, up-quench, and step quench method in the water and oil media. It was observed that the faster the cooling rate, the more β-Zr phase was transformed, and the smaller, needle shaped grain was formed. The mechanical properties were investigated using the Hardness Vickers Test, in which the highest hardness result was shown by direct quench water with 282.58±4.124 VHN. The high temperature corrosion process was done at 400°C and 500°C for 24 hours with TGA test at 500°C with holding time for 30 minutes. The result of the corrosion test is the as-received specimen had all black surface with nodules, indicating the ZrO2 oxide formed. Meanwhile for heat treatment specimen, ZrO2 transformed into white color from black color. This is due to the β-transformation process that was taking place during quenching process influencing the ZrO2 formed combined with continuous oxidation. The effect is more apparent at higher temperature 500℃ than 400℃ The thermogravimetry analysis shows that the result with the lowest rate of increase in weight is up-quench water specimen with value of 2.234 gr/m2/hour.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Korosi Temperatur Tinggi, Media Pendingin, Metode Quench, Zircaloy-4, High Temperature Corrosion, Quench Media, Quench Method, Zircaloy-4
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA418.42 Hardness properties and tests. Hardness--Testing. T Technology > TA Engineering (General). Civil engineering (General) > TA418.75 Corrosion-resistant materials T Technology > TN Mining engineering. Metallurgy > TN690 Metallography. Physical metallurgy T Technology > TN Mining engineering. Metallurgy > TN752.Q4 Metals--Quenching
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 27101-(S2) Master Thesis
Depositing User:	Muhammad Rafly Ramadhani
Date Deposited:	02 Aug 2024 07:03
Last Modified:	02 Aug 2024 07:03
URI:	http://repository.its.ac.id/id/eprint/111661

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