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All Journal Rekayasa Mesin Jurnal Rekayasa Mesin International Journal of Applied Sciences and Smart Technologies Prosiding Seminar Nasional Sains Teknologi dan Inovasi Indonesia (Senastindo) Jurnal Polimesin
I Made Wicaksana Ekaputra
Universitas Sanata Dharma
Automotive Engineering Computer Science & IT Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Other

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CARBON SIZE AND TEMPERATURE EFFECTS TO JIS S45C CARBURIZED STEEL Ekaputra, I Made Wicaksana; Wibisono, Yustinus Akas; Haryadi, Gunawan Dwi
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1499

Abstract

Wear on a metal can be naturally found in components that operate in a friction environment, such as in a transmission system. However, it can be a substantial problem when the wear rate is not within the permitted limit. Surface hardening is a popular way to improve surface wear resistance for metals with various parameters that can be controlled during the process. In this study, pack carburizing was conducted for plain carbon steel JIS S45C. The carburizing process is conducted on the steel by varying the carbon size and temperature during the heating process. The carbon size consisted of mesh sizes of 5 and 15. The heating process was conducted for 2 hours at 800oC and 900oC. The carbon media and catalyst used in this study were coconut charcoal and calcium carbonate (CaCO3). In addition, the hardness Vickers test was conducted to evaluate the surface hardness. It was found that the hardness of Vickers increased with an increase in heating temperature and mesh size of carbon.
INVESTIGASI LAJU REGANGAN CREEP BAJA TAHAN KARAT FERRITIC PADA TEMPERATUR 570 °C Ekaputra, I Made Wicaksana
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1848

Abstract

The probabilistic assessment of failure due to the creep phenomenon must be determined with the minimum deviation. Since the creep failure took years before rupture, laboratory experiments were conducted to represent the failure time. However, the laboratory results are only an empirical approach; therefore, the probabilistic assessment can be deviated. A huge number of variables in creep experiments must be conducted to minimize the deviation. This study investigated the creep strain rate for the 9Cr-1Mo ferritic stainless steel. The lever-arm creep machine was used for the creep rupture test, and the test followed the standard of ASTM E139. The constant loads were applied in the range of 250 – 170 MPa with the homologous temperature of 570 °C. The curve of strain to time was recorded from each constant load condition. The creep strain rate was then calculated and presented in the curve of the creep strain rate to the applied load. The linear regression was drawn from the curve by applying Norton’s equation. By obtaining the creep strain hardening coefficient and exponent, an initial probabilistic assessment of creep failure at a temperature of 570 °C can be predicted.  
Evaluation of stress–relieving heat treatment on mechanical properties and microstructure of friction-welded JIS S45C steel Susanto, Alexander Eka; Haryadi, Gunawan Dwi; Haryanto, Ismoyo; Sulardjaka, Sulardjaka; Nugroho, Sri; Ekaputra, I Made Wicaksana
Jurnal Polimesin Vol 23, No 3 (2025): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i3.6522

Abstract

This research evaluates the effect of stress-relieving post-weld heat treatment (PWHT) on the mechanical properties and microstructure of friction-welded JIS S45C steel joints. The PWHT was conducted at 500 °C for 1 hour. Tensile and Vickers microhardness tests were performed on both as-welded and heat-treated specimens. The tensile tests showed that fracture consistently occurred in the base metal, confirming good weld quality. Stress-relieved specimens showed a 3% increase in elongation compared to the as-welded condition, indicating improved plasticity. The Vickers microhardness tests revealed around 10% decrease in hardness at the weld center zone (from 293 HV to 267 HV) and heat-affected zone (from 245 HV to 224 HV) after treatment. Metallographic observation indicated coarsening of the pearlite phase due to thermal exposure.
Comparative Analysis of Creep Deformation in Ferritic Martensitic Steel Across BM, WJ, and HAZ Regions at 570°C Ekaputra, I Made Wicaksana
Jurnal Rekayasa Mesin Vol. 17 No. 1 (2026)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v17i1.2071

Abstract

Creep is a time-dependent deformation in which failure can occur in years. The probabilistic assessment was a typical method for predicting creep deformation. The prediction was conducted by extrapolating the short-time creep laboratory test to the long-time data. A small deviation of extrapolation data was expected. Hence, a large number of creep tests were needed, since deviations in material properties cannot be avoided, especially in welded materials. In this study, the creep strain rate of Gr-91 steel was compared among the base metal (BM), weld joint (WJ), and heat-affected zone (HAZ). Welded steel was manufactured by the tungsten inert gas welding method. The creep test was conducted for each of the BM, WJ, and HAZ specimens using a lever-arm-type creep machine, following ASTM E139. The homologous creep temperature was set at 570 °C for a series of constant load ranges from 250 to 160 MPa. The strain-time curves of BM, WJ, and HAZ were generated after the specimens were fractured. The trend line of the creep strain rate is then determined using Norton’s equation. The creep mechanism of BM, WJ, and HAZ was investigated based on the creep exponent and strain hardening coefficient obtained from Norton’s equation.
Co-Authors Arnold A.I. Litaay Budi Setyahandana Deka Setyawan Freddy Saputra Romamti-Ezer Taebenu Gunawan Dwi Haryadi Heryoga Winarbawa Ismoyo Haryanto Joga Dharma Setiawan Litaay, Arnold A. I. Rando Tungga Dewa Rines Rines Sri Nugroho Sulardjaka Sulardjaka Susanto, Alexander Eka Utomo, Angelius Fredy Wibisono, Yustinus Akas