Studi Pengaruh Proses Electrical Discharge Machining Terhadap Ketebalan Recast Layer dan HAZ Layer Pada Permukaan Blade Turbin Gas Menggunakan Scanning Electron Microscope

Jelita, Pinkan Tanika (2024) Studi Pengaruh Proses Electrical Discharge Machining Terhadap Ketebalan Recast Layer dan HAZ Layer Pada Permukaan Blade Turbin Gas Menggunakan Scanning Electron Microscope. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pemberian artificial defect (cacat buatan) berupa proses permesinan EDM pada permukaan blade turbin dapat menghilangkan dan memotong material melalui panas dari pelepasan listrik yang cepat. Ketika suatu material diberi proses EDM, terdapat panas yang menyebabkan munculnya lapisan baru pada permukaan material atau biasa disebut recast layer dan munculnya daerah terdampak panas (Heat Affected Zone). Dari uraian tersebut, perlu dilakukan penelitian mengenai ketebalan recast layer dan HAZ layer yang terbentuk, serta kandungan komposisi kimia dari material akibat proses EDM yang diberikan. Penelitian dilakukan dengan dengan pemberian proses EDM die-sink dan wirecut pada blade turbin yang selanjutnya sampel dianalisa menggunakan Scanning Electron Microscope (SEM) untuk melihat perubahan lapisan yang terjadi pada permukaan tiap sampel. Ketebalan recast layer serta HAZ layer yang terjadi akibat proses EDM die-sink dan wirecut dihitung dan dibandingkan untuk mengetahui pengaruh dari tiap proses EDM pada bagian airfoil dan dovetail. Setelah itu, dilakukan pula pengujian SEM-EDX untuk mendeteksi komposisi kimia dari sampel dengan lokasi yang berbeda. Hasil dari penelitian ini adalah sampel blade turbin yang diberi proses EDM, baik die-sink maupun wirecut, menunjukkan bahwa ketebalan recast layer dan HAZ layer pada bagian airfoil memiliki ketebalan yang lebih besar dibandingkan bagian dovetail karena proses EDM yang diberikan berlangsung lebih lama sehingga material yang melebur lebih banyak. Kemudian, hasil analisa dari SEM-EDX menunjukkan bahwa sampel blade turbin memiliki komposisi kimia yang didominasi dengan kandungan unsur Fe yang tinggi dan diikuti dengan kandungan Cr yang cukup tinggi. Dari perbandingan dua lokasi titik pengujian komposisi kimia, didapatkan bahwa terdapat beberapa unsur kimia dari material yang mengalami perubahan akibat adanya proses EDM.
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The provision of artificial defects in the form of EDM machining processes on the surface of turbine blades can remove and cut material through heat from rapid electrical discharges. When a material is given an EDM process, there is heat that causes a new layer to appear on the surface of the material or commonly called a recast layer and the appearance of a heat-affected area (Heat Affected Zone). From this explanation, it is necessary to conduct research on the thickness of the recast layer and the HAZ layer formed, as well as the chemical composition of the material due to the EDM process given. The research was carried out by providing the EDM die-sink and wirecut processes on the turbine blade, then the samples were analyzed using a Scanning Electron Microscope (SEM) to see the changes in the layers that occur on the surface of each sample. The thickness of the recast layer and the HAZ layer that occur due to the EDM die-sink and wirecut processes are calculated and compared to determine the effect of each EDM process on the airfoil and dovetail sections. After that, SEM-EDX testing was also carried out to detect the chemical composition of samples with different locations. The results of this study are turbine blade samples that are given the EDM process, both die-sink and wirecut, showing that the thickness of the recast layer and HAZ layer on the airfoil section has a greater thickness than the dovetail section because the EDM process given lasts longer so that more material is melted. Then, the results of the SEM-EDX analysis show that the turbine blade sample has a chemical composition dominated by a high Fe content and followed by a fairly high Cr content. From a comparison of the two locations of the chemical composition test points, it was found that there were several chemical elements of the material that changed due to the EDM process.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Blade turbin, EDM, SEM-EDX, Turbine Blade
Subjects:	T Technology > TN Mining engineering. Metallurgy > TN752.Q4 Metals--Quenching
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Pinkan Tanika Jelita
Date Deposited:	26 Aug 2024 02:32
Last Modified:	26 Aug 2024 02:32
URI:	http://repository.its.ac.id/id/eprint/113326

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