Pengaruh Transfer Time Pada Proses Austempering Terhadap Struktur Mikro, Kekerasan Dan Ketangguhan Material Besi Tuang Nodular Grade 500

Aminuddin, Muhammad Rizal (2008) Pengaruh Transfer Time Pada Proses Austempering Terhadap Struktur Mikro, Kekerasan Dan Ketangguhan Material Besi Tuang Nodular Grade 500. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Austempered ductile iron (ADI) merupakan material inovatif yang nilai produksinya murah, tetapi memiliki properties mekanik yang lebih baik dari material konvensional pada umumnya. Pada kenyataannya, pada pembuatan material ADI masih didapati properties yang tidak seperti diharapkan. Hal ini dikarenakan ada faktor yang masih belum dipahami oleh orang-orang, yaitu proses pemindahan material dari lingkungan austenisasi menuju lingkungan austempering. Pada penelitian ini dilakukan dengan proses Austempering. Mula-mula material Nodular Cast Iron dipanaskan sampai temperatur Austenisasi 900 °C, ditahan pada temperatur tersebut selama 60 menit. Selanjutnya material dipindahkan dari dapur austenisasi menuju dapur tempering menurut variasi transfer time yang diinginkan. Austempering pada temperatur 316 dan ditahan selama 60 menit, lalu di dinginkan normal di udara. Kemudian dilakukan pengujian metalografi, kekerasan dan ketangguhan untuk diamati dan dianalisa tentang pengaruh transfer time dalam austempering terhadap struktur mikro, kekerasan dan ketangguhan. Dari hasil yang didapat bahwa dengan semakin pendek transfer time menghasilkan kekerasan yang semakin tinggi, sedangkan ketangguhan tidak mengalami banyak perubahan dari material awal. Pengaruh ini dapat diakibatkan oleh terbentuknya struktur mikro bainite dan ferrite Sebaliknya, dengan transfer time yang lebih lama menghasilkan kekerasan yang lebih rendah juga ketangguhan yang rendah pula, kondisi ini diakibatkan oleh selain terbentuknya struktur mikro bainite danferrite juga terbentuk pearlite
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Austempered ductile iron (ADI) is an innovative material with low production cost but has better mechanical properties than conventional materials in general. In fact, in the manufacture of ADI material, properties are still found to be not as expected. This is because there are factors that are still not understood by people, namely the process of transferring material from the austenitizing environment to the austempering environment. In this study, the Austempering process was carried out. Initially, the Nodular Cast Iron material was heated to an austenitizing temperature of 900 °C, held at that temperature for 60 minutes. Next, the material was transferred from the austenitizing furnace to the tempering furnace according to the desired transfer time variation. Austempering at a temperature of 316 and held for 60 minutes, then cooled normally in air. Then, metallographic, hardness and toughness tests were carried out to observe and analyze the effect of transfer time in austempering on the microstructure, hardness and toughness. From the results obtained, the shorter the transfer time, the higher the hardness, while the toughness did not experience much change from the initial material. This effect can be caused by the formation of bainite and ferrite microstructures. Conversely, with a longer transfer time, lower hardness and low toughness are produced. This condition is caused by the formation of pearlite and ferrite microstructures in addition to the formation of bainite and ferrite microstructures

Item Type:	Thesis (Other)
Additional Information:	RSM 671.36 Ami p-1 2008 (weeding)
Uncontrolled Keywords:	austempered dJlctile iron, austempering, transfer time; austempered ductile iron, austempering, transfer time
Subjects:	T Technology > TN Mining engineering. Metallurgy > TN23 Metal cladding. T Technology > TN Mining engineering. Metallurgy > TN690 Metallography. Physical metallurgy
Divisions:	Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	EKO BUDI RAHARJO
Date Deposited:	23 Oct 2025 05:48
Last Modified:	23 Oct 2025 05:48
URI:	http://repository.its.ac.id/id/eprint/128668

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