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Sabtun Ismi Khasanah
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Computer Science & IT Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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PENGARUH PENAMBAHAN PROSES INOKULASI TERHADAP STRUKTUR MIKRO DAN KEKERASAN PRODUK COR DENGAN MATERIAL FC 250 Sabtun Ismi Khasanah; Zikri Niamillah, Muhammad; Aditya Mardani, Danis; Suparni, Suparni
JURNAL FOUNDRY Vol. 7 No. 1 (2024): JURNAL FOUNDRY
Publisher : LPPM Politeknik Manufaktur Ceper

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62944/jf.v7i1.102

Abstract

The inoculation process in metal casting is needed to make grey cast iron or nodular cast iron. Inoculation aims to increase the number of freezing nuclei and promotes the formation of a homogeneous microstructure. This research aims to determine the effect of the inoculation addition process on the microstructure and hardness of PP products with FC-250 material. The changes made include changes to the inoculation process and changes to the chemical composition of the induction furnace. Changes in the inoculation process include changing the inoculation process which was initially only carried out on ladles with an inoculation material weight of 0.5 kg to 2 processes, namely on ladles with an additional weight of 0.8 kg of inoculation material and an inoculation process on crucible (kowi) with an additional material weight of 0.4 kg. The results of the metallography test after the additional inoculation process showed that the pearlite and ferrite graphite spread evenly and fell into Type-A graphite. The hardness test results show that the effect of adding inoculation changes the level of hardness so that it complies with ASTM 40 specifications/standards, namely 180 – 302 HB. The hardness value after the addition of the inoculation process was 190 HB.
PENGARUH PENAMBAHAN INOKULASI TERHADAP STRUKTUR MIKRO DAN KEKERASAN PRODUK COR DENGAN MATERIAL FC 250 Sabtun Ismi Khasanah; Muhammad Zikri Niamillah; Danis Aditya Mardani; Suparni
Journal Foundry Vol. 7 No. 1 (2024): Journal Foundry
Publisher : Journal Foundry

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Abstract

Proses inokulasi dalam pengecoran logam diperlukan pada pembuatan besi cor kelabu ataupun besi cor nodular. Inokulasi bertujuan untuk meningkatkan jumlah inti pembekuan dan menyegeramkan struktur mikro. Tujuan dari penelitian ini adalah mengetahui pengaruh pada proses penambahan inokulasi terhadap strukturmikro dan kekerasan pada produk pressure plate dengan material FC-250. Perubahan yang dilakukan berupa perubahan proses inokulasi dan perubahan komposisi kimia pada tanur induksi. Perubahan proses inokulasi meliputi perubahan proses inokulasi yang awalnya hanya dilakukan pada ladle dengan berat material inokulasi 0.5 kg menjadi 2 kali proses yaitu pada ladle dengan berat penambahan material inokulasi 0.8 kg dan proses inokulasi pada kowi dengan berat penambahan material 0.4 kg. Hasil pengujian metalografi setelah dilakukan penambahan inokulasi menunjukan bahwa grafit perlit dan ferit menyebar secara merata dan masuk kedalam grafit Type-A. Hasil pengujian kekerasan menunjukan bahwa pengaruh penambahan inokulasi merubah tingkat kekerasan sehingga sesuai spesifikasi/standar ASTM 40 yaitu 180 – 302 HB. Nilai kekerasan setelah penambahan proses inokulasi pada area body sebesar 191,7 HB dan pada area ear sebesar 191,85 HB.
Co-Authors Aditya Mardani, Danis Dian Prabowo Hamid Abdillah Mardani, Danis Aditya Muhammad Zikri Niamillah Radhi Ariawan suparni Suparni Suparni Ulikaryani, Ulikaryani Unggul Satria Jati Zikri Niamillah, Muhammad