Article Per Year (5 Year)
p-Index From 2020 - 2025
0
P-Index
This Author published in this journals
All Journal Semesta Teknika JMPM (Jurnal Material dan Proses Manufaktur)
Mudjijana Mudjijana
Universitas Gadjah Mada
Engineering Mechanical Engineering

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Peningkatan Ketahanan Korosi Pada Material Biomedik Plat Penyambung Tulang SS 304 Dengan Gabungan Metode Shot peening dan Electroplating Ni-Cr Sunardi Sunardi; Priyo Tri Iswanto; Mudjijana Mudjijana
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v18i2.1817

Abstract

Stainless steel (SS) 304 is widely used as biomedical materials because of its lower cost and its availability. However its corrosion resistance is lower than that of the SS 316L. The purpose of this study is to determine the influence of the combination surface treatment i.e. shot peening treatment and electroplating Ni-Cr on the corrosion resistance in simulated body fluid (SBF) of SS 304 material. The shot peening treatments were carried out using a variable period of 5, 15 and 30 minutes. Diameter steel balls of 0.6 mm with a hardness of 40-50 HRc, was applied. Pressure compressor was maintained in the range of 6 -7 kg / cm2 with nozzle diameter and the distance between nozzle and the specimen of 5 mm and 10 cm respectively. After shot peening process, the specimens were nickel-electroplated using a voltage of 2 V at current of 0.03 A with the distance between the electrode of 4 cm for 15 minutes. After nickel-electroplated process the specimens were chrome-electroplated using a voltage of 4.5 V at current 0.3 A with the distance between the electrode of 15 cm for 5 minutes. The specimen was then tested its corrosion rate in the test medium SBF using Galvanostat M 273 in the range of -20 mV s / d 20 mV. The corrosion test results show that SS 316L and SS 304 without treatment have corrosion rate respectively 1.212 X 10-3 mm / year and 4,003 x 10-3 mm / year. Which means that corrosion rate of SS 304 is 333% higher than SS 316L. The corrosion rate after treatment shot peening 5, 15 and 30 minutes followed by Ni-Cr electroplating is respectively 2.121 x 10-3 mm / year, 0.554 x 10-3 mm / year and 0 mm / year (not detected by the measurement instrument).
Physical and mechanical properties of semi-automatic MIG welding of AA5083H116 materials Mudjijana Mudjijana
JMPM (Jurnal Material dan Proses Manufaktur) Vol 2, No 1 (2018): Juni
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jmpm.2116

Abstract

Metal inert gas (MIG) welding speed can be carried out manually for complicated components and can also be controlled using computer numerical control (CNC). The purpose of the research is to investigate the effect of CNC welding speed on physical and mechanical properties of AA5083H116. AA5083H116 base metal, ER5356 electrodes, welding speeds of 8, 10, 12 mm/s, current of 120 A, voltage of 19 V, filling speed of 27 mm/s, argon gas rate of 15 liter/minute were used. Distortions after welding were measured using dial indicators, thermal cycles was recorded using type-K thermocouple using National instruments NI USB-9162 apparatus connected to a CPU. The physical properties was analyzed using SEM and EDS for only the best mechanical properties, and the mechanical properties were evaluated using Vickers microhardness, and tensile and bending universal testing machine. The results show that at the welding speed of 8 mm/s automatic regulated was the best mechanical properties compare to previous study at the welding speed of 10 mm/s manually regulated. However, SEM images show that there were several micro cracks at its grain, and several magnesium precipitates can be noticed from the EDS analysis.
Co-Authors Priyo Tri Iswanto Sunardi, Sunardi