Analisis Struktur Mikro dan Sifat Mekanik Pelapisan Flame Spray Dengan Variasi Rasio NiCrBSi/Al2O3 Dan Temperatur Post-Annealing Pada Stainless Steel 304

Sa'id, Achmad Umar (2024) Analisis Struktur Mikro dan Sifat Mekanik Pelapisan Flame Spray Dengan Variasi Rasio NiCrBSi/Al2O3 Dan Temperatur Post-Annealing Pada Stainless Steel 304. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pelapisan flame spray masih sering digunakan karena biayanya yang rendah, penggunaan yang lebih praktis, tingkat deposisi dan efisiensi yang tinggi, dan penggunaan material yang bervariasi, tanpa terbatas bentuk dan ukuran komponen. Sifat mekanik dan ketahanan material pelapis dengan paduan berbasis nikel, terutama pada kondisi temperatur tinggi, dapat ditingkatkan dengan penambahan keramik. Penelitian terkait pengembangan modifikasi komposit material coating NiCrBSi/Al2O3 terus berlanjut. Perlakuan post-annealing yang diberikan pada pelapisan flame spray dapat mengubah sifat struktur dan mekaniknya dengan cara meningkatkan sifat adhesi dan kekerasan, mengurangi jumlah porositas, dan memberikan pengaruh terhadap sifat ketahanan aus. Tujuan penelitian ini adalah untuk menganalisis pengaruh rasio komposisi material umpan dalam pelapis flame spray powder NiCrBSi/Al2O3 pada stainless steel 304. Variasi rasio NiCrBSi/Al2O3 (wt.%) yang digunakan adalah 80/20, 70/30, dan 60/40. Perlakuan post-annealing juga dilakukan untuk menganalisis perubahan struktur mikro dan sifat mekanik dari hasil proses pelapisan. Variasi temperatur didasarkan pada hasil analisis pengujian DSC dari pelapisan flame spray NiCrBSi, yaitu pada temperatur 890 ℃ dan 970 ℃. Dalam penelitian ini proses perlakuan post-annealing dilakukan menggunakan furnace dengan waktu tahan 30 menit. Hasil aplikasi pelapisan secara as-sprayed dan post-annealed dilakukan pengujian untuk mengetahui sifat struktur dan morfologi dengan pengujian metalografi, SEM-EDX, dan XRD, serta pengujian mekanik berupa pengujian kekerasan mikro vickers, pull-off, dan ketahanan aus. Hasil pengamatan struktur mikro menunjukkan pengaruh yang tidak signifikan pada variasi penambahan keramik Al2O3. Struktur hasil pelapisan terlihat karakter yang beragam dan tidak homogen. Pada pemberian perlakuan post-annealing, terjadi perubahan struktur yang lebih homogen dan terjadi proses difusi pada lapisan interface. Hasil pengujian mekanik terjadi perubahan seiring dengan perubahan struktur mikro. Peningkatan kekerasan tertinggi diperoleh pada hasil pelapisan as-sprayed dengan komposisi penambahan 40% Al2O3 sebesar 955,71 HV0,3. Nilai kekuatan adhesi paling tinggi diperoleh pada hasil perlakuan post-annealing 970 °C sebesar 11,21 ± 1,42 MPa.
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Flame spray coating is still frequently used due to its low cost, more practical use, high deposition rate and efficiency, and the use of a variety of materials, without being limited to the shape and size of components. The mechanical properties and durability of coating materials with nickel-based alloys, especially at high temperature conditions, can be improved by the addition of ceramics. Research related to the development of modified NiCrBSi/Al2O3 composite coating materials continues. The post-annealing treatment given to the flame spray coating can change its microstructure and mechanical properties by increasing adhesion and hardness properties, reducing the amount of porosity, and influencing wear resistance properties. The purpose of this study is to analyze the effect of the composition ratio of feed material in NiCrBSi/Al2O3 flame spray powder coatings on 304 stainless steel. The NiCrBSi/Al2O3 ratio variations (wt.%) used were 80/20, 70/30, and 60/40. Post-annealing treatment was also carried out to analyze changes in the microstructure and mechanical properties of the coating process results. The temperature variation is based on the results of DSC test analysis of NiCrBSi flame spray coating, which were at temperatures of 890℃ and 970℃. In this study, the post-annealing treatment process was carried out using a furnace with a holding time of 30 minutes. The results of as-sprayed and post-annealed coating applications were tested to determine structural and morphological properties with metallographic, SEM-EDX, and XRD testing, as well as mechanical testing in the form of Vickers microhardness, pull-off, and wear resistance testing. The results of microstructure observations show an insignificant effect on the variation of Al2O3 ceramic additions. The structure of the coating results looks diverse and inhomogeneous character. In the case of post-annealing treatment, a more homogeneous structure changes and a diffusion process occurs in the interface layer. The results of mechanical testing changes along with changes in microstructure. The highest increase in hardness was obtained in the as-sprayed coating results with the composition of adding 40% Al2O3 of 955.71 HV0.3. The highest adhesion strength value was obtained at 970°C post-annealing treatment of 11.21 ± 1.42 MPa.

Item Type: Thesis (Other)
Uncontrolled Keywords: Al2O3, Flame Spray Coating, NiCrBSi, Post-Annealing Al2O3, Flame Spray Coating, NiCrBSi, Post-Annealing
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA418.16 Materials--Testing.
T Technology > TA Engineering (General). Civil engineering (General) > TA418.42 Hardness properties and tests. Hardness--Testing.
T Technology > TA Engineering (General). Civil engineering (General) > TA418.9.C57 Coatings
T Technology > TA Engineering (General). Civil engineering (General) > TA433 Strength of materials.
T Technology > TA Engineering (General). Civil engineering (General) > TA455.A34 Adhesives
T Technology > TA Engineering (General). Civil engineering (General) > TA491 Metal coating.
T Technology > TJ Mechanical engineering and machinery > TJ263.5 Boilers (general)
T Technology > TJ Mechanical engineering and machinery > TJ561 Surface
Divisions: Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User: Achmad Umar Sa'id
Date Deposited: 02 Aug 2024 08:49
Last Modified: 24 Sep 2024 01:41
URI: http://repository.its.ac.id/id/eprint/111022

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