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All Journal Jurnal Ilmiah Teknik Mesin
Harnowo Supriadi
Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung
Mechanical Engineering

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Pengaruh Variasi Media Pendingin Bersirkulasi dan Pembukaan Katup pada Proses Quenching Terhadap Nilai Impak Baja AISI 1045 Bastiyan Dwi Julian; Harnowo Supriadi; Sugiyanto
Jurnal Ilmiah Teknik Mesin FEMA Vol. 3 No. 1 (2025)
Publisher : FT UNILA

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Abstract

Baja AISI 1045 merupakan baja karbon sedang dengan kadar karbon 0,45%. Karakteristik baja ini dapat dimodifikasi melalui perlakuan panas, salah satunya proses quenching. Proses ini melibatkan pemanasan hingga 800°C dengan waktu tahan 15 menit, kemudian didinginkan cepat menggunakan variasi media pendingin tersirkulasi dan bukaan katup yang berbeda. Media pendingin yang digunakan meliputi air, larutan garam, dan solar, masing-masing dengan bukaan katup 180°, 90°, dan 45°. Pengujian sifat mekanik dilakukan menggunakan metode Charpy impact test. Hasil pengujian menunjukkan nilai impak raw material sebesar 0,154 J/mm². Setelah proses quenching, nilai impak pada media air berturut-turut sebesar 0,558; 0,570; dan 0,591 J/mm², pada larutan garam sebesar 0,504; 0,516; dan 0,525 J/mm², serta pada solar sebesar 0,637; 0,660; dan 0,670 J/mm². Struktur makro hasil fraktografi menunjukkan patahan crystalline dan fibrous. Hasil ini menegaskan bahwa media pendingin solar dengan bukaan katup 45° menghasilkan nilai impak tertinggi, sehingga direkomendasikan untuk meningkatkan ketangguhan baja AISI 1045.
PENGARUH PEMANFAATAN ZEOLIT PELET TERAKTIVASI NaOH-FISIK DENGAN NORMALITAS TINGGI TERHADAP PRESTASI MESIN DIESEL 4-LANGKAH Eko Hermawan; Herry Wardono; Harnowo Supriadi
Jurnal Ilmiah Teknik Mesin FEMA Vol. 4 No. 1 (2026)
Publisher : FT UNILA

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Abstract

Zeolites are alumina silicate compounds which have the ability as adsorbents. In this study, the ability of zeolite was used to filter air for the combustion process in order to improve the performance of a 4-strokes diesel engine. The zeolite activated by NaOH was used to clean the surface of the pores and get rid of impurities, so that the zeolite could bind nitrogen gas dan water vapor when used. In these tests, zeolites were activated by NaOH using 1N;2N;3N;4N normality and physical activation at 200OC for 1 hour. The zeolites were then formed into tablets and packaged in a frame that was placed on diesel engine air filter. The experiments were operated at engine speeds of 1500, 2000, 2500, 3000 rpm. It is found that chemically and physically activated zeolites could improve the performance of the engine. The results showed that the best increase of  averagebrake power was 1.6605% occurring at zeolite activated using NaOH 1N and the best decrease of avarage brake specific fuel consumption was 2.836% using also NaOH 1N – physical activated zeolite. Both occurred at dense zeolites arrangement.
Co-Authors Bastiyan Dwi Julian Eko Hermawan Herry Wardono Sugiyanto