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Artono Raharjo
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Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Pengaruh Variasi Media Pendingin Terhadap Kekerasan dan Mikrostruktur Pada Pengecoran Aluminium 6061 Sigit Kristiadi; Unung Lesmanah; Artono Raharjo
RING ME Vol 2 No 2 (2022): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rm.v2i2.19906

Abstract

The casting and the cooling process on the metal can affect the mechanical properties and physical properties that are formed. Changes in metal properties are influenced by the type and cooling medium in the metal cooling process. This study aims to determine the effect of different cooling media (Water, Dromus, and Coolant radiator) in the Quenching process on the hardness and microstructure of Aluminum 6061 which has passed the casting stage. It can be concluded that the variations in the cooling media used affect the different levels of hardness and microstructure of the test specimens. From the test results, it was found that the Water cooling media specimen had the highest level of hardness, the smallest grain size, and the amount of α-Al matrix formed was lower than the Dromus cooling media specimen. The test object with Dromus cooling medium has a higher hardness level, smaller grain size, and the amount of α-Al matrix formed is lower than the Coolant radiator coolant media test object which has the lowest hardness level, the largest grain size, and the amount of α-Al matrix the most
PENGARUH VARIASI ORIENTASI dan FRAKSI VOLUME SERAT ECENG GONDOK TERHADAP KEKUATAN UJI IMPACT KOMPOSIT SERAT ECENG GONDOK Rosidi, Izza; Mochammad Basjir; Artono Raharjo
RING ME Vol 3 No 2 (2023): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rm.v3i2.21436

Abstract

Composite is a group of materials made from 2 or more materials and strengthened by certain treatments. To strengthen the composite, it can be done through Alkalization treatment, meaning that the fiber is soaked in a NaOH solution for a specified time to clean the surface of the fiber so that it will increase the cellulose content by reducing the lignin and hemicellulose content. Apart from alkalization, increasing the strength of the composite can be done by treating the layout of the fiber orientation and volume fraction. The research results show that the average impact price for water hyacinth fiber composites is water hyacinth fiber composite with a volume fraction of 30; 70 and 50 : 50, namely for volume fraction 30 : 70 is continuous vertical orientation: 2, 84 joules/mm, continuous horizontal orientation: 1.44 joules/mm, random orientation: 1, 88 joules/mm then for volume fraction 50: 50 is continuous vertical orientation: 3.69 joules/mm, continuous horizontal orientation: 2.26 joules/mm, random orientation: 3.1 joules/mm. From the data that has been obtained, it shows that the most optimal impact value is in the fiber orientation. continuous vertical with a volume fraction of 50 : 50, namely 3.69 joules/mm. In this study the volume fraction was 50; 50 has the highest impact price, fiber volume greatly influences the results of the impact test
ANALISIS PENGARUH PERLAKUAN PANAS HASIL PENGELASAN GMAW BAJA ST - 40 TERHADAP KEKERASAN DAN STRUKTUR MIKRO Muhammad Ikhwanul Munir; Priyagung Hartono; Artono Raharjo
RING ME Vol 3 No 2 (2023): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rm.v3i2.21502

Abstract

ABSTRACT Currently, many welding elements are involved in construction, especially in the field of design, because welding is one way of making connections, and to obtain good quality connections requires the skills of technically advanced welders. One welding method that is often used in the manufacturing industry is Gas Metal Arc Welding (GMAW). This welding uses noble gases and carbon dioxide gas as a shield for the arc and molten metal from atmospheric influences. After testing the micro Rockwell hardness and micro structure, data was obtained that could be analyzed further. In this study, the material was ST 40 steel with a thickness of 10 mm, welding was carried out using GMAW welding with butt join welding and 1G position. Hardness testing uses the micro rockwell method at each time variation of 60 minutes, 90 minutes and 120 minutes at the Weld metal point and HAZ (Heat Affected Zone) with a maximum load of 650 g. Micro Rockwell hardness test results from the three time variations, the highest hardness value was found in welding with a time of 120 minutes with a value for weld metal of 71.3 HRN and a HAZ of 62.3 HRN. The lowest hardness value was found in welding using a time of 60 minutes with a value for weld metal of 68.6 HRN and HAZ of 59.1 HRN. Keywords: GMAW Welding, Rockwell Hardness, Microstructure
PENAMBAHAN TONGKOL JAGUNG PADA BATUBARA TERHADAP PERFORMA PLTU 2X150 DENGAN PROSES CO-FIRING MENGGUNAKAN SIMULASI CYCLE-TEMPO Riyan Hidayat; Ena Marlina; Artono Raharjo
RING ME Vol 4 No 2 (2024): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rme.v4i2.22596

Abstract

Co-firing adalah proses pembakaran campuran dua jenis bahan bakar untuk mengurangi emisi gas buang. Penelitian ini menggunakan simulasi Cycle-Tempo berdasarkan neraca panas Perusahaan Listrik Tenaga Uap (PLTU) 2×150 MW. Bahan bakar utama adalah batubara highest heating value (HHV) 4200 kal/gram, dengan biomassa tongkol jagung yang memiliki kandungan sulfur rendah. Rasio campuran yang dianalisis adalah 0%, 25%, dan 50%. Hasil menunjukkan daya boiler tertinggi pada rasio 0% (28.702,97 kW, efisiensi 82%), sementara rasio 25% dan 50% menurun menjadi 28.427,09 kW (efisiensi 81%) dan 28.122,75 kW (efisiensi 79%). Daya bersih pembangkit juga menurun dari 15.625,9 kW (rasio 0%) menjadi 15.281,1 kW (rasio 50%). Penurunan performa disebabkan oleh pencampuran biomassa yang kurang optimal untuk pembangkit. Net Plant Heat Rate (NPHR) menunjukkan efisiensi terbaik pada rasio 0%, mendukung pembangkit menghasilkan energi dengan lebih mudah. Co-firing biomassa dapat mengurangi emisi tetapi menurunkan performa pembangkit secara keseluruhan.
Co-Authors Basjir, Mochammad Ena Marlina Muhammad Ikhwanul Munir Priyagung Hartono Riyan Hidayat Rosidi, Izza Sigit Kristiadi Unung Lesmanah