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All Journal Jurnal Metalurgi dan Material Indonesia Specta Journal of Technology
Riska Rachmantyo
Kelompok Keahlian Ilmu Dan Teknik Material, Fakultas Teknik Mesin Dan Dirgantara, Institut Teknologi Bandung
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering

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Pengaruh Temperatur dan Rapat Arus Terhadap Kekerasan dan Distorsi Kisi pada Hard Chromium Plating pada Baja Karbon Rendah Riska Rachmantyo; Aditianto Ramelan; Akhmad Zein Eko Mustofa; Asep Ridwan Setiawan
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 2 (2019): Agustus
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

Hard Chromium Plating is one of several coating techniques that has been applied to engineering components. The hard chromium layers have several properties such as, hardness, high corrosion and wear resistance. In fact the quality is determined by several process parameters during electro deposition. In this experiment temperature and current density were varied to observe the effect on the quality of hard chromium layer deposited on a steel base plate. This was to find the appropriate combination of producing deposited layer with the optimum quality. The electroplating process was carried out for 60 minutes at 50, 55 and 60 oC with current density variation of 70, 80 and 90 A/dm2. The specimen were then undergone hardness test and XRD characterization. Maximum hardness measured was 1128 HV this was plated at 55°C with a current density of 80 A/dm2. XRD analysis shown that the increasing hardness of hard chromium plating is related with an increase of microstrain calculated from the diffractogram pattern.
Komposit Aluminium 1100 ‐ Nano Alumina Metode Dispersi Mekanik Screen Printing dan Ultrasonic Fogger Accumulated Roll Bonding: Aluminum 1100 - Nano Alumina Composite with Mechanical Screen Printing and Ultrasonic Fogger Dispersion Method on Accumulated Roll Bonding Process Riska Rachmantyo; Aditianto Ramelan; Firmansyah Sasmita
Jurnal Metalurgi dan Material Indonesia Vol. 3 No. 1 (2020): April
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Aluminum material that is commonly used in life. This material is lightweight, corrosion resistant, tough and good working process. However, strength and hardness are lower than other metals such as steel. Processing needs to be done to get better aluminum mechanical properties. In this study, making a metal matrix composite in which aluminum 1100 as a substrate and 10 nm nano alumina (Al2O3) powder as a reinforcement. The process of making composites uses the method of accumulated roll bonding. The distribution of alumina powder on the aluminum matrix greatly influences the mechanical properties produced, namely its strength and hardness. The distribution process of nano alumina is carried out using screen printing, spray and ultrasonic spray methods. Besides the distribution method, the amount of alumina is also used as a research parameter. Improved optimum mechanical properties were obtained from the ultrasonic spray spray distribution method with the addition of 5 w/0 alumina.
Studi Pengujian Tidak Merusak Ultrasonik pada Frekuensi 50 kHz untuk Modulus Elastisitas, Porositas, dan Kekuatan Tekan Beton Rachmantyo, Riska; Nur Aziiz, Muhammad Sefano
SPECTA Journal of Technology Vol. 7 No. 2 (2023): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/specta.v7i2.869

Abstract

Important properties of structural materials, especially ceramics and concrete, are modulus of elasticity, porosity, and compressive strength. In the case of concrete, the modulus of elasticity of each material varies widely. The porosity created during the manufacturing process cannot be separated from the elastic modulus. Specimen testing methods typically involve compression testing, but only know the mechanical properties, not the porosity. The porosity of concrete materials can be measured using the non-destructive ultrasonic testing method. The modulus of elasticity to compressive strength can be measured froaamiim the resulting porosity value. Besides porosity, concrete properties are also affected by the water/cement ratio or w/c composition. Data from existing research results, which have certain limitations, were used in this research. The modulus of elasticity and compressive strength were calculated from the data of 39 ultrasonic tests of concrete samples with water/cement ratio variations ranging from 0.27 to 0.9 at a frequency of 50 kHz. Porosity ranged from 2.210% to 16.324% in the test results. According to the calculation, the average modulus of elasticity is 16.011 GPa and the average compressive strength is 13.36 MPa. As a result, porosity rises, reducing modulus of elasticity and compressive strength.
Co-Authors Akhmad Zein Eko Mustofa Asep Ridwan Setiawan Firmansyah Sasmita Nur Aziiz, Muhammad Sefano Ramelan, Aditianto