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All Journal Journal of Engineering and Scientific Research (JESR) RING Mechanical Engineering
Harnowo Supriadi
University of Lampung
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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The Effect of Barite Addition and Graphite Particle Size on The Specific Abrasion of Fly-Ash/Phenolic Composite for Brake Lining Application Shirley Savetlana; Zulhanif Zulhanif; Harnowo Supriadi; Irvan Ramadhan; Teten Beliantara
Journal of Engineering and Scientific Research Vol. 4 No. 1 (2022)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (888.599 KB) | DOI: 10.23960/jesr.v4i1.102

Abstract

Annually, million tons of fly-ash and bottom fly-ash is a waste of coal power plant. Fly ash contains Iron-oxide, alumina and silica. Those hard particle makes fly-ash can be used as a reinforcement in polymer composite. This composite is a wear resistance material and can be used as material for brake lining application. Fly ash reinforced phenolic composite has a low specific abrasion. The composite for brake lining material consisted of the reinforcement, friction modifier, solid lubricant and filler. Graphite is used as solid lubricant while barite is used as filler. Many research were carried out research on the particle size effect on the composite mechanical properties. However the size different between the constituent in composite has not investigated. Also the optimal barite weight fraction has not being observed. The composite was made by mixing all of the constituent, pressing in the mold and curing. The result show that the graphite particle size ? 150 mm has the lowest specific abrasion. The observation using scanning electron microscope shows that the composite contained small particle of ? 56 mm tends to agglomerate than the composite contained larger particle of ? 150 mm. the composite contained 15% barite has the lowest specific abrasion. The micrograph of scanning electron microscope shows the mixed of phenolic and barite evenly covered the graphite and fly-ash particles.
Experimental Study on the Effect of Single and Double Quenching-Tempering on the Mechanical Properties of AISI 1045 Steel Syaipudin Anwar; Harnowo Supriadi; Nafrizal; Rizal Adi Saputra; Andree Agasy Nofma
RING ME Vol 6 No 1 (2026): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rme.v6i1.25379

Abstract

This study examined the effects of quenching, single quenching–tempering (SQT), and double quenching–tempering (DQT) on the microstructure and mechanical properties of AISI 1045 medium-carbon steel (0.54% C, 0.32% Si, 0.65% Mn, 0.015% P, 0.0112% S, balance Fe). All specimens were heated to 850°C for 25 minutes and quenched in coconut oil at 100°C. Tempering was subsequently performed at 650°C for the SQT and DQT treatments. Hardness testing revealed that quenching produced the highest hardness value of 242.38 kg/mm² due to the formation of martensite. The SQT treatment reduced hardness to 198.46 kg/mm², indicating improved toughness while maintaining relatively high hardness. Further reduction in hardness was observed in the DQT-treated specimens, reaching 158.13 kg/mm², reflecting a more ductile and tougher microstructure. Impact properties were evaluated using the Charpy method. Heat-treated specimens exhibited significantly higher impact strength than the untreated material. The SQT process increased impact strength to 1.5792 J/mm², demonstrating the beneficial effect of tempering on toughness. The highest impact strength was achieved through DQT, reaching 1.8542 J/mm², indicating superior energy absorption capability. The results show that repeated quenching and tempering cycles effectively enhance the toughness of AISI 1045 steel, although accompanied by a reduction in hardness. Overall, DQT provided the best improvement in impact resistance and toughness among the heat treatment conditions investigated.
Co-Authors Andree Agasy Nofma Irvan Ramadhan Nafrizal Rizal Adi Saputra Shirley Savetlana Syaipudin Anwar Teten Beliantara Zulhanif Zulhanif