PENGARUH JENIS KATALIS PADA PROSES CARBURIZING TERHADAP NILAI KEKERASAN DAN STRUKTUR MIKRO BAJA KARBON RENDAH

SARIPUDIN, DIDIN and Fusito, Fusito (2017) PENGARUH JENIS KATALIS PADA PROSES CARBURIZING TERHADAP NILAI KEKERASAN DAN STRUKTUR MIKRO BAJA KARBON RENDAH. Undergraduate thesis, Sriwijaya university.

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Abstract

Carburizing process is a surface treatment by adding carbon element on Steel surface through heating on critical temperature about between 800 °C -950 °C and Holding certain time range for getting high hardening on Steel surface. Steel on critical temperature has affinity or inclination to form Chemical bond towards carbon. Carbon which is absorbed into Steel forms (pack solution) carbon Steel, this case is caused carbon atoms on critical temperature has atom size (radius) smaller than iron atom size then carbon atoms will get into spaces among iron atom which caused increasing hardness on Steel. Carbon media which is used in this research is coconut shell charcoal powder 70 % by adding variation of calcium and sodium carbonate catalyst 30 % and heated by temperature 920 °C with Holding time 30 minutes. Specimen which is used in this research is low carbon Steel 0,267% C, it is type of Steel which has lower carbon than high and medium carbon Steel. In specimen, it is done experiment of vickers hardness and micro structure, then it is done data processing. From hardness experiment research on raw material specimen, it has harness value VHN about average 122,275. Then, specimen of calcium carbonate catalyst has hardness value about 134,892, while specimen of sodium carbonate has harness 148,377. On micro structure experiment seems from carburizing specimen with sodium carbonate catalyst is more optimal than calcium carbonate of higher hardness because water consumption as cooledfast reactor will give experimental result of sprayed surface hardness though it is done for an equal variation. Based on micro structure observation on perimeter area specimen with sodium carbonate catalyst has more martensite structure than specimen of sodium carbonate catalyst, but after observing in middle area of specimen, there is no martensite structure, it caused some factors which influence is not so long in holding time. Quenching media used, catalyst used, surface of dirty specimen, potential carbon gets into unavailable Steel. Generally, adding 30 % calcium and sodium carbonate catalyst doesn 7 give significant difference, it is caused by adding 30 % catalyst weight, it has lower case depth by giving maximal thic/cening with calcium carbonate catalyst 0,0261 mm, and sodium carbonate 0,0266 mm, this case is caused by pressure of CO gas formation and affected carbon atom removing out, and high gas pressure causes CO gas out from tube and pack media burnt perfectly being ash Keywords: Carburizing, low carbon Steel, hardness test, microstructures test.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Carburizing., Baja karbon rendah, uji kekerasan, struktur mikro
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ227-240 Machine design and drawing
Divisions:	03-Faculty of Engineering > 21201-Mechanical Engineering (S1)
Depositing User:	Ichlasyah Aisyah
Date Deposited:	09 Sep 2025 03:27
Last Modified:	09 Sep 2025 03:27
URI:	http://repository.unsri.ac.id/id/eprint/183749

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