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All Journal Journal of Metallurgical Engineering and Processing Technology
Imam Prabowo
Universitas Pembangunan Nasional Veteran Yogyakarta
Chemical Engineering, Chemistry & Bioengineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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Peningkatan Nilai Kekerasan Baja Karbon Rendah AISI 1018 melalui Proses Pack Karburizing dengan Media Batok Kelapa Imam Prabowo; Muhammad Ichsanudin; Abdu Halim Wibowo; Fajar Paundra; Eko Pujiyulianto
Journal of Metallurgical Engineering and Processing Technology Vol 3, No 2 (February 2023)
Publisher : UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v3i2.8701

Abstract

Low carbon materials are one of the steels which have a composition of carbon ranging from 0.005 to 0.3%. Generally, these materials have good ductility and flexibility so they are good enough to be applied for automotive industry’s components. Unfortunately, they do not possess an excellent hardness as well as wear resistance. Thus, in order to enhance the hardness and wear resistance, carburizing is obligatory required. The carburizing process is a diffusion of carbon from the higher to lower concentration in a high temperature condition, following the gradient concentration. In addition, the process demands a source of active carbons and energizer. In this study, the coconut shells are possibly harnessed as a high-rich carbon material besides charcoals due to its availability and environmentally-friendly materials. Hardness test is measured in ten distinct points by using vicker-hardness scale in accordance with ASTM E 384. The hardness of the AISI 1018 increases after pack carburizing process by nearly 20 HVN. It grows from 131 HVN before the process to 150 and 165 HVN after the heating by 900°C and 950°C respectively. The increase is affected by the diffusion of carbon from coconut shells into the layer of AISI 1018 in which the coconut shells are having a higher carbon content compared to the layer. Furthermore, the higher heating temperature will accelerate the diffusion rate of carbon. As a result, the hardness of AISI 1018 at the higher heating temperature will also become larger.
Analisis Sifat Mekanik Material Baja Karbon Rendah ST 37 Akibat Dari Pengujian Tarik Berdasarkan Data Manual dan Komputer Imam Prabowo; Muhammad Ichsanudin
Journal of Metallurgical Engineering and Processing Technology Vol 2, No 3 (July 2022) Special Edition
Publisher : UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v2i3.9386

Abstract

ST 37 Steel is categorized as a low carbon steel which has a composition of carbon around0.005 to 0.3% weight. It has good ductility, flexibility, weldability and formability so can be applied for automotive industry’s components as well as material constructions. Unfortunately, it does not possess an excellent hardness and wear resistance. In this research, ST 37 was subjected to tensile testing to understanding its mechanical properties of ST 37 Steel by comparing the data obtained from manual and computerized procedures. The tensile testing was conducted by Universal Testing Machine (Tarno Grocki), applying ASTM E8/E8M. The results of the experiments revealing the ultimate tensile strength of ST 37 Steel based on computerized and manual procedures are 524,03 MPa and 511,44 Mpa respectively. In addition, the Young modulus of ST 37 Steel based on computerized and manual procedures are 524,03 MPa and 511,44 Mpa respectively. In addition, the Young modulus of manual and computerized procedures are 16,338 GPa and 3,598 Gpa consecutively. Moreover, the yield strength was 411,03 Mpa. The differences between manual and computerized procedures were due to sampling time, parallax and cosine errors and the distinct number of data. Furthermore, the surface of the material after tensile testing showed ductile fracture mechanism in which the fracture was shaped like a cup and cone and formed an angle of 45o. The surface is also displaying a filamentous shape because of the tensile force.
Co-Authors Abdu Halim Wibowo Eko Pujiyulianto Fajar Paundra Muhammad Ichsanudin Muhammad Ichsanudin