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All Journal JOURNAL OF ELECTRICAL AND SYSTEM CONTROL ENGINEERING Journal Dynamic SainT
Yafet Bontong
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Pengaruh Temperatur Austenit dengan Holding Time 2 Jam Terhadap Kekerasan dan Ketangguhan Baja ST 42 Nitha; Yafet Bontong; Petrus Sampelawang; Lantana Dioren Rumpa; Nofrianto Pasae; Fikran
JOURNAL OF ELECTRICAL AND SYSTEM CONTROL ENGINEERING Vol. 7 No. 2 (2024): Journal of Electrical and System Control Engineering
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jesce.v7i2.11332

Abstract

Steel is an alloy metal with iron as the basic element and carbon as the main alloying element. The carbon content in steel ranges from 0.2% to 2.1% by weight according to the grade. The function of carbon in steel is as a hardening element. This research aims to determine the effect of austenite temperature with a holding time of 2 hours on the hardness and toughness of ST 42 steel. The material for this research is ST 42 steel. This research was carried out experimentally using the Vickers method and impact method, with temperature variations of 950℃, 960℃, 970℃, 980℃. From the results of the hardness research, it can be concluded that the higher the austenite temperature variation with a holding time of 2 hours, the higher the hardness value in ST 42 steel, where the highest value at a temperature of 980℃ is 204.8 kg/mm2, and the lowest is in a normal specimen with a value of 186.6 kg/mm2, and from the toughness research results it can be concluded that the higher the austenite temperature variation with a holding time of 2 hours, the lower the toughness value of ST 42 steel, where the highest value at an austenite temperature of 960°C is 2,023 Joules/mm2 and the lowest in normal specimens it is 0.866 Joules/mm2.
PERILAKU MEKANIS BAJA KARBON AKIBAT PACK CARBURIZING DENGAN MEDIA ARANG TULANG KERBAU Yafet Bontong; Nitha; Mius Barto Belopadang
Jurnal Dynamic Saint Vol 7 No 1 (2022): Jurnal Dynamic Saint
Publisher : Publikasi dan UKI Press UKI Toraja.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47178/dynamicsaint.v7i1.2391

Abstract

Arang Tulang Kerbau merupakan salah satu energizer yang dapat digunakan pada proses carburizing khususnya pada karburasi padat. Mengingat ketersediaan tulang kerbau terlebih di daerah Toraja dari rumah potong hewan dan dari pesta pemakaman masyarakat Toraja. Hal ini sangat menunjang pemanfaataan tulang kerbau dalam penelitian pack carburizing ini. Arang tulang kerbau yang digunakan dengan ukuran arang mesh 20 dan 30 dengan persentase volume arang dan Barium Carbonat 60%ATK+40%BaCO3, 70%ATK+30%BaCO3, 80%ATK+20%BaCO3 yang dipanaskan dalam tungku pada suhu 8500C dan 9500C digunakan untuk sumber karbon pada baja karbon rendah untuk mengetahui pengaruhnya proses karburasi padat terhadap kekerasan baja karbon rendah tersebut. Penelitian kekerasan untuk bahan normal atau tanpa perlakuan untuk baja karbon rendah 92,7 Kg/mm2 dan setelah mengalami proses karburasi padat diperoleh kekerasan tertinggi pada baja karbon rendah pada mesh 20 dan temperatur pemanasan 8500C dengan persentase arang tulang kerbau 80%ATK+20%BaCO3 yakni 318,749 kg/mm2. Dari hasil penelitian diperoleh bahwa proses karburasi padat dengan media arang tulang kerbau meningkatkan nilai kekerasan baja karbon rendah.
Analisis Permukaan Baja ST 42 dalam Pengaruh Variasi Kecepatan Spindel dan Kedalaman Pemotongan pada Kekasaran Hasil Teknologi Pemesinan Chendri Johan; Alfendi Ranteallo; Yafet Bontong; Sallolo Suluh; Pineng, Martina
JOURNAL OF ELECTRICAL AND SYSTEM CONTROL ENGINEERING Vol. 8 No. 2 (2025): Journal of Electrical and System Control Engineering
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jesce.v8i2.13159

Abstract

Surface roughness is an important aspect in machining that affects the appearance and function of the product. This study examines the effect of spindle speed and depth of cut on the surface roughness of ST 42 steel using HSS tools. Workpieces with a length of 300 mm and a diameter of 25 mm were processed with variations in spindle speed of 250, 350, and 450 rpm and depths of cut of 0.6, 0.7, and 0.8 mm. Roughness measurements were carried out using a surface tester. The results showed that at 250 rpm, the surface roughness was 0.0554 μm, at 350 rpm, 0.0517 μm, and at 450 rpm, 0.0416 μm. For the depth of cut, the roughness values were 0.0509 μm (0.6 mm), 0.0523 μm (0.7 mm), and 0.0542 μm (0.8 mm), respectively. The conclusion shows that increasing spindle speed reduces surface roughness, while depth of cut has a less significant effect.
Co-Authors Alfendi Ranteallo Chendri Johan Fikran Martina Pineng Mius Barto Belopadang Nitha Nitha Nofrianto Pasae Rumpa, Lantana Dioren Sallolo Suluh Sampelawang, Petrus