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All Journal Jurnal Engine: Energi, Manufaktur, dan Material Applied Research and Smart Technology (ARSTech)
Sukarjo, Heribertus
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Automotive Engineering Computer Science & IT Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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The effectivity of used-oil as quenching medium of 42-CrMo4 steel for automotive materials Hariningsih, Hariningsih; Sumpena, Sumpena; Sukarjo, Heribertus
Applied Research and Smart Technology (ARSTech) Vol. 1 No. 1 (2020): Applied Research and Smart Technology (ARSTech)
Publisher : Department of Mechanical Engineering Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/arstech.v1i1.11

Abstract

The research aims to investigate the effect of the cooling medium on the hardness characteristic and microstructure of the 42CrMo4 steel due to hardening treatment at a temperature of 830°C and holding time of 30 minutes. Various oil such as SAE-10W40, SAE-20W50, SAE-40, and used oil was used in the cooling medium. The changes in product size, hardness, and microstructure have been carefully assessed. The results indicated that the viscosity of the coolant medium strongly influenced the cooling rate of the cooling medium, hardness, and microstructure. SAE-10W40 oil and SAE-20W50 oil only needed 2 hours to return within room temperatures before quenching, whereas SAE-40 oil and used oil took 3 hours. The sample size did not change after hardening-quenching. However, there was a residual carbon layer on the sample surfaces. Quenching caused the changes of microstructure from pearlite and ferrite to ultrafine double phase, consisting of martensite and austenite, which were unable to transform during rapid cooling. The highest hardness value was achieved by the treated product, which was quenched in SAE-10W40, which had 54.59 HRC. The high hardness was attributed to the content of 95% martensite. However, used-oil caused in similar hardness as SAE-20W50.
Model Pengembangan Pembangkit Listrik Tenaga Panas Bumi (PLTPB) untuk Industri Pariwisata di Daerah Lereng Gunung Ungaran Jawa Tengah Juwitasari, Rena; Sukarjo, Heribertus; Setiadi, Hari
Jurnal Engine: Energi, Manufaktur, dan Material Vol. 8 No. 1 (2024)
Publisher : Proklamasi 45 University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30588/jeemm.v8i1.1460

Abstract

Mount Ungaran which is located in Central Java province potential for utilization of geothermal energy. Seen the discovery several geothermal manifestations example fumarole and hot springs. The temperature of the reservoir reached > 2250 C allows to do utilization of electrical energy around the area. In addition to its geothermal energy area around Mount Ungaran is the natural tourism potential, there are five object tourism around Mount Ungaran namely hot springs consist of Temple Gedongsongo, Nglimut, Umbul Sidomukti, Kendalisodo and Diwak . To reduce the burden of the Government against a coal-fired power supply as well as increase the independence of the energy sector for the industry, then the existence of this energy source can be utilized more broadly to support the activities of the industry, in particular the tourist industry that area around the slopes of Mount Ungaran. The results of the analysis showed that geothermal Gedongsongo worth in subtitution of  the Power of  Plant coal. Geothermal power plant scale pico (5kWe - 10 kWe) can be utilized in geothermal field Gedongsongo and can reach out to the surrounding area five object tourism slopes of Mount Ungaran.
The effectivity of used-oil as quenching medium of 42-CrMo4 steel for automotive materials Hariningsih, Hariningsih; Sumpena, Sumpena; Sukarjo, Heribertus
Applied Research and Smart Technology (ARSTech) Vol. 1 No. 1 (2020): Applied Research and Smart Technology
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/arstech.v1i1.11

Abstract

The research aims to investigate the effect of the cooling medium on the hardness characteristic and microstructure of the 42CrMo4 steel due to hardening treatment at a temperature of 830°C and holding time of 30 minutes. Various oil such as SAE-10W40, SAE-20W50, SAE-40, and used oil was used in the cooling medium. The changes in product size, hardness, and microstructure have been carefully assessed. The results indicated that the viscosity of the coolant medium strongly influenced the cooling rate of the cooling medium, hardness, and microstructure. SAE-10W40 oil and SAE-20W50 oil only needed 2 hours to return within room temperatures before quenching, whereas SAE-40 oil and used oil took 3 hours. The sample size did not change after hardening-quenching. However, there was a residual carbon layer on the sample surfaces. Quenching caused the changes of microstructure from pearlite and ferrite to ultrafine double phase, consisting of martensite and austenite, which were unable to transform during rapid cooling. The highest hardness value was achieved by the treated product, which was quenched in SAE-10W40, which had 54.59 HRC. The high hardness was attributed to the content of 95% martensite. However, used-oil caused in similar hardness as SAE-20W50.
Co-Authors Hari Setiadi, Hari Hariningsih, Hariningsih Rena Juwita Sari Sumpena, Sumpena