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Akhlis Rahman Sari Nurhidayat
Universitas Jendral Soedirman
Computer Science & IT Electrical & Electronics Engineering Mechanical Engineering

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Pengaruh Metode Quenching dan Tempering Terhadap Kekerasan Material Hot rolled Plate (HRP) Steel Akhlis Rahman Sari Nurhidayat; Nur Akhlis Sarihidaya Laksana; Yurianto Yurianto
Infotekmesin Vol 14 No 2 (2023): Infotekmesin: Juli, 2023
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v14i2.1927

Abstract

Hot rolled plate steel as a material to be used for steel armor needs to have the characteristics of a high hardness value. Medium carbon steel as the basic material is quenched at a temperature of 900 oC and tempering is carried out at a temperature of 125 oC and 175 oC with a holding time of 30 minutes. The Ms value is a benchmark for changes in martensite which is influenced by the constituent elements of the material. The use of water as a quench medium changes the structure of austenite to martensite. The martensite structure that occurs increases the optimum hardness value in HRP Steel material. The tempering process carried out above the Ms value causes a decrease in the hardness value. The highest hardness value was obtained in the quenching process with 542 HV which was influenced by the distribution of martensite. The decrease in hardness value occurs due to the tempering process, the average hardness value at temper 125 oC is 524.4 HV and 175 oC is 524 HV.
Analisis Performa dan Studi Konsumsi Energi Kendaraan Listrik Sepeda Motor Listrik SEMOLI Nur Akhlis Sarihidaya Laksana; Radhi Ariawan; Bayu Aji Girawan; Akhlis Rahman Sari Nurhidayat
Infotekmesin Vol 15 No 1 (2024): Infotekmesin: Januari, 2024
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v15i1.2093

Abstract

In this article the author conducts research related to energy consumption studies on electric motorbike vehicles (SEMOLI) made and developed by the author. The purpose of the energy consumption study is to determine the energy consumption of electric motorbike vehicles that have been made for further improvement and development. The method used is experimentation with the first phase testing on a straight flat road for one kilometer with flat road conditions, this phase of experimental results shows an average energy consumption of 30 Wh, for an average uphill road consumption of 40 km / h and for the second phase of experimental data using experimental methods with speed parameters 30 - 35 km energy consumption has an average of 30 Wh, at speeds of 40 - 45 km / h energy consumption has an average of 28 Wh, and 50-55 km / h average energy consumption of 27 Wh. The test results show that on flat road conditions and the increasing speed, the energy consumption will decrease.
Effect of Binder, Concentration, and Particle Size on Spent Coffee Grounds Briquette Akhlis Rahman Sari Nurhidayat; Ameliyana Rizky Syamara Putri Akhmad Yani; Ghaniyya Dzihni Jayanti; Cahya Widya Wati; Nur Akhlis Sarihidaya Laksana
Infotekmesin Vol 17 No 2 (2026): Infotekmesin: Juli 2026
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/

Abstract

Spent coffee grounds are organic waste that have the potential to be developed as raw material for biomass briquettes. This study aims to examine the effect of binder type, mixture ratio, and particle size on the characteristics of spent coffee grounds briquettes. Testing included calorific value using the Bomb Calorimeter method based on ASTM D 240-02, as well as moisture and ash content using the Gravimetric method. Results show that binder type was the most dominant factor. Briquettes with guar gum binder produced the highest average calorific value of 17,043.5 J/g (specimen 1) and the lowest ash content of 1.27 %wt, far superior to combustion residue briquettes, which yielded only 10,352.5 J/g with 28.78 %wt ash content. Fine particle size (<200 mesh) was shown to improve calorific value, while increasing the proportion of spent coffee grounds in residue-based briquettes effectively reduced ash content. All specimens exhibited moisture content below 15 %wt.
Co-Authors Ameliyana Rizky Syamara Putri Akhmad Yani Bayu Aji Girawan Cahya Widya Wati Ghaniyya Dzihni Jayanti Nur Akhlis Sarihidaya Laksana Nur Akhlis Sarihidaya Laksana Radhi Ariawan Yurianto Yurianto