The role of nitrogen gas in fluidized bed reactors on the nodular iron nitridation processs

Sujana, Wayan and Widi, Komang Astana and Pohan, Gerald A. and Prihatmi, Tutut Nani (2021) The role of nitrogen gas in fluidized bed reactors on the nodular iron nitridation processs. In: IOP Conf. Series: Materials Science and Engineering, 10-14 October 2021, Orlando.

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Abstract

Abstract. Nitriding process using ammonia gas as a nitrogen source has been carried out with the aim of improving the surface quality of nodular cast iron until the highest surface hardness reaches 426.2 HV. In this study, the nitriding process was carried out with a variety of advanced processes using nitrogen gas in the fluidized bed reactor and without using nitrogen gas in the muffle furnace with a constant variable nitriding time of 4 hours. The continued process is 2 hours each, while the gas composition used is 80% ammonia and 20% nitrogen with a total gas flow of 0.7 m2 hour-1. From the result of SEM test analysis obtained in the advanced process variations with nitrogen gas in the fluidized bed reactor and without nitrogen gas in the muffle furnace, on the surface of nodular cast iron a nitride layer was formed in the form of Fe3N and Fe4N. The largest average thickness formed in advanced process specimens using nitrogen gas in the fluidized bed reactor was 24.64 μm and without using nitrogen gas was 6.06 μm. The EDX test analysis showed that the specimens that received treatment with nitrogen gas had a nitrogen gas content of 43.7% higher than the specimens that did not receive the treatment. The hardness test results showed the distribution of hardness values in specimens that received treatment with nitrogen and without nitrogen. The highest surface hardness is 560.6 HV on the surface of the specimen with nitrogen gas while the specimen without nitrogen gas has a hardness of 426.2 HV. Keywords: nitriding, surface hardness, nitride layer, nitrogen gas role

Item Type:	Conference or Workshop Item (Paper)
Uncontrolled Keywords:	nitriding, surface hardness, nitride layer, nitrogen gas role
Subjects:	Engineering > Mechanical Engineering
Divisions:	Fakultas Teknologi Industri > Teknik Mesin S1
Depositing User:	Ms Nunuk Yuli
Date Deposited:	27 Sep 2021 02:44
Last Modified:	27 Sep 2021 02:44
URI:	http://eprints.itn.ac.id/id/eprint/5643

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