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Sobron Yamin Lubis
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Mechanical Engineering

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KARAKTERISTIK SIFAT MEKANIS DAN STRUKTUR MIKRO PROSES AUSTEMPER PADA BAJA KARBON S 45 C DAN S 60 C Lim Richie Stifler; Sobron Yamin Lubis; Erwin Siahaan
Jurnal Ilmiah Teknik Mesin POROS Vol 14, No 1 (2016): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (837.596 KB) | DOI: 10.24912/poros.v14i1.827

Abstract

Abstract: Steel is an iron-carbon alloys containing concentrations of other alloys having a different composition and treatment materials, steel properties can be changed by heat treatment. The heat treatment process serves to increase the strength of a steel material. The nature of the material can be turned into a more robust and resilient heat treatment process, if done properly and correctly. Austempering process is just one example of the heat treatment process at steel that aims to improve the mechanical properties of the steel S 45 C and S 60 C. austempering process performed on the steel S 45 C and S 60 C aims to increase the hardness and toughness of the steel. Austempering process is done by austenisasi advance with temperature 8500C and held for 60 minutes, after which the process is carried out with 3 election austempering temperature of 3500C, 4500C, 5500C and held for 30 minutes. The method used to test the results of austempering is tensile testing using ASTM A370- 12a, Vickers hardness test and microstructure observation using a digital microscope. In the test results tensile steel S 45 C and S 60 C values obtained an increase in ductility and toughness of 17.1 % on steel S 45 C and 17 % on steel S 60 C. This value is obtained from the calculation of ultimate tensile strength test specimens that have not been in austempering process with a specimen that has been in the process of austempering at 3500C , and the results of testing hardness of the steel S 45 C and S 60 C obtained hardness value of 44% increase in steel S 45 C and 46 % on steel S 60 C. value this is obtained from the calculation of the average value of the test specimen is not in the process of austempering with a specimen that has been in the process of austempering at 3500C . 
STRUKTUR MIKRO DAN SIFAT MEKANIS ALUMINIUM PADUAN SERI 6063 HASIL COR DARI CETAKAN LOGAM, PASIR RESIN FURAN DAN PASIR KOMOSSA Chris Marvin; Eddy S Siradj; Sobron Yamin Lubis
Jurnal Ilmiah Teknik Mesin POROS Vol 14, No 1 (2016): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (512.502 KB) | DOI: 10.24912/poros.v14i1.833

Abstract

Abstract: Material developments in Indonesia is already very advanced rapidly certainly need high level of violence but has a mass of light. Aluminum should be developed because it possesses a lightweight and available in the land of our country that is rich in agricultural products. As an alternative to strengthen aluminum alloy that is with Si and Mg, as well as the rapid cooling process when smelting. This study was conducted to observe the microstructure and mechanical properties of the raw material of aluminum alloy series 6063. Tests conducted with metal mold, furan resin sand mold, commossa sand mold, the cooling rate of each mold will affect the hardness of the material which can be seen microstructure with microstructural observations. The survey results revealed that the aluminum with a metal mold casting has a hardness of 54 HRB, furan resin sand has a hardness of 40 HRB, sand commossa has a hardness of 33 HRB. Metal mold has a shock force of 0,316 J/mm2, particularly a furan resin sand shock force of 0,265 J/mm2, commossa sand has a shock force of 0.206 J/mm2. Metal mold has a high hardness compared with furan resin sand rated second, while the sand was rated commossa end but increasingly harsh mean tenacity of a material value will increase. According to the test micro structure, the aluminum is brittle, the distance or the distribution of grain will be a meeting or a lot. 
PENGARUH MEDIA PENDINGIN PADA PROSES HARDENING MATERIAL BAJA S45C Syaifudin Yuri; Sofyan Djamil; Sobron Yamin Lubis
Jurnal Ilmiah Teknik Mesin POROS Vol 14, No 2 (2016): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (798.193 KB) | DOI: 10.24912/poros.v14i2.838

Abstract

Abstract: Hardening is the process of heating the steel to a temperature of austenite and then dyeing is done quickly, the process is carried out to improve the properties of steel hardness. The method used in this research using books and journal literature .The purpose of this study to determine the mechanical properties of the steel that is cooled by the cooling medium brine , oil, water and air in the cooling medium to the level of violence after the S45C steel is hardened in a hardening process and microstructure . The study starts from the cutting hardness test specimen with a diameter of 65 mm x 7 mm x 10 mm and impact test with a diameter of 10 mm x 10 mm x 55 mm . The results obtained hardness test salt water has the average value of hardness 95 BHN , the average value of hardness oli 89 BHN , the average value of water hardness 94 BHN , the average value of hardness air 87 BHN and hardness values without in hardening 88 BHN , impact test on the air has an average value 1.175 J/
ANALISIS KEKUATAN RANGKA BATANG KOMPONEN MESIN PRESS KEMASAN MINUMAN LOGAM NON FERRO Mikael Sean Hendito; Daniel Joachim; Harto Tanujaya; Sobron Yamin Lubis
POROS Vol. 17 No. 2 (2021): Jurnal Ilmiah Teknik Mesin Poros
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/poros.v17i2.20044

Abstract

Beverage cans is a sheet coated of steel with tin (Sn). It is a steel sheet container coated with thin white tin that has a content value of 1.00% to 1.25% of the total weight of that can. The method used in this design is to make a truss design using special design software then determine the constituent materials and dimensions of the truss then do a strength analysis of the truss. The purpose of this design is to determine the maximum strength of the press machine truss that can be accepted with a certain force. This design starts from making a truss design with dimensions of length, width, and height are 260 mm, 100 mm, and 500 mm, respectively. The result obtained from this design are that the bending moment obtained is 43.8 MPa, the total moment of inertia is 38,286.9 mm4, the maximum stress in the truss is 23 MPa while the allowable stress according to the frame material made of Hollow iron is 124 MPa.
Co-Authors Chris Marvin Daniel Joachim Eddy S Siradj Erwin Siahaan Harto Tanujaya Lim Richie Stifler Mikael Sean Hendito Sofyan Djamil Syaifudin Yuri