Pengaruh Variasi Tekanan Shot Peening dengan Kombinasi Implantasi Ion Nitrogen dan Sputtering TiN terhadap Sifat Fisis, Mekanis dan Ketahanan Korosi Stainless Steel 316L
MUHAMMAD HUSSEIN DAHLAN, Dr. Eng. Priyo Tri Iswanto, S.T. M.Eng.
2020 | Skripsi | S1 TEKNIK MESINStainless steel 316L telah banyak digunakan sebagai material dalam pembuatan implan tulang. Namun, SS 316L masih perlu untuk diberikan peningkatkan sifat fisis, mekanis dan wettabilitynya. Shot peening merupakan metode perlakuan permukaan yang dapat meningkatkan kualitas material. Kombinasi implantasi ion nitrogen dan sputtering TiN akan menambah kekerasan material SS 316L. Perlakuan shot peening dilakukan pada permukaan spesimen raw material SS 316L menggunakan 3 variasi tekanan noozle yaitu 8, 12, dan 15 bar dengan durasi 30 menit, diameter steel ball 0,6 mm dengan kekerasan 40-50 HRc, diameter nozzle 5 mm, dan jarak tembak 6 cm. Implantasi ion nitrogen dilakukan dengan energi 60 KeV, arus 30 �¼A selama 100 menit. Proses sputtering dilakukan pada permukaan spesimen dengan variasi gas 20% N2 dan 30% N2 selama 120 menit menggunakan tegangan 5 kV dan arus 5-10 mA pada tekanan 7,9 x 10-2 mbar. Hasil penelitian menunjukan bahwa semakin tinggi tekanan pada nozzle pada proses shot peening akan membuat permukaan SS 316L menjadi semakin halus, terjadi perbedaan yang tidak signifikan pada variasi perbandingan tekanan gas N2 20% dan 30% pada proses sputtering. Perlakuan kombinasi shot peening, implantasi ion nitrogen dan sputtering TiN meningkatkan nilai kekerasan permukaan hingga 150-300%. Nilai kekerasan permukaan terbesar terjadi pada spesimen hasil shot peening dengan tekanan nozzle 15 bar dan sputtering dengan perbandingan gas N2 30% sebesar 1146,71 kgf/mm2. Perlakuan kombinasi shot peening, implantasi ion nitrogen dan sputtering TiN menambah sifat hydrophilic material. Perlakuan kombinasi shot peening, implantasi ion nitrogen dan sputtering TiN meningkatkan ketahanan korosi permukaan dan korosi sumuran.
Stainless steel 316 L has been widely used as a material in the manufacture of bone implants. However, SS 316 L still needs to be given an increase in physical, mechanical and wettability. Shot peening is a surface treatment method that can improve material quality. The combination of nitrogen ion implantation and TiN sputtering will increase the hardness of SS 316 L material. Shot peening method is carried out on the surface of SS 316 L raw material specimens with nozzle pressure variations at 8, 12, and 15 bar with duration of 30 minutes, steel ball diameter 0.6 mm with hardness of 40-50 HRc, nozzle diameter 5 mm, and 6 cm shooting range. Nitrogen ion implantation is carried out with 60 KeV energy, 30 �¼A current and 100 minutes ion implantation time. The sputtering process is caried out on the surface of the specimen with a ratio of gas variations of 20% N2 and 30% N2 for 120 minutes, using a voltage of 5 kV and the current of 5-10 mA at a pressure of 7.9 x 10-2 mbar. The results showed that the higher the pressure on the nozzle in the shot peening process will make the surface of SS 316 L become smoother, there is an insignificant difference in the variation of the N2 gas pressure ratio of 20% and 30% in the sputtering process. The combination of shot peening, nitrogen ion implantation and TiN sputtering increase the surface hardness value up to 150-300%. The highest value of surface hardness occurs in the specimen shot peening results with nozzle pressure of 15 bar and sputtering with a gas pressure ratio of 30% N2 at 1146.71 kgf/mm2. The combination of shot peening, nitrogen ion implantation and TiN sputtering increase the hydrophilic properties of the material. The combination of shot peening, nitrogen ion implantation and TiN sputtering increase surface and pitting corrosion resistance. Keywords : shot peening, stainless steel 316 L, ion implantation, TiN sputtering
Kata Kunci : shot peening, stainless steel 316 L, implantasi ion, sputtering TiN
