DOI: https://doi.org/10.14710/teknik.v44i1.49496

Pengaruh Variasi Temperatur Solution Treatment pada Kekerasan dan Presipitat Paduan Co-30Cr-5Mo-0,32C-0,23N

*Fendy Rokhmanto  -  Research Center for Metallurgy, Indonesia
Malau Daniel Panghihutan  -  Research Center for Metallurgy, National Research and Innovation Agency, Indonesia
Ariani Pradhita Putri  -  Departemen Teknik Mesin Sekolah Vokasi Universitas Gadjah Mada, Indonesia
Benidiktus Tulung Prayoga  -  Departemen Teknik Mesin Sekolah Vokasi Universitas Gadjah Mada, Indonesia
Ika Kartika  -  Research Center for Metallurgy, National Research and Innovation Agency, Indonesia
Aprilia Erryani  -  Research Center for Metallurgy, National Research and Innovation Agency, Indonesia
Made Subekti Dwijaya  -  Research Center for Metallurgy, National Research and Innovation Agency, Indonesia
Galih Senopati  -  Research Center for Metallurgy, National Research and Innovation Agency, Indonesia
Albertus Deny Heri Setyawan  -  Research Center for Metallurgy, National Research and Innovation Agency, Indonesia
Cahya Sutowo  -  Research Center for Metallurgy, National Research and Innovation Agency, Indonesia
Open Access Copyright (c) 2023 TEKNIK

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Abstract
Paduan kobal banyak digunakan sebagai material implan orthopaedi karena faktor biokompatibilitas material, ketahanan korosi, sifat mekanis yang baik, dan juga sifat mampu bentuknya. Pada penelitian ini nilai kekerasan dimodifikasi melalui proses heat treatment. Proses heat treatment diharapkan dapat menurunkan nilai kekerasan paduan. Paduan Co-30Cr-5Mo-0.32C-0.23N hasil coran dihomogenisasi pada temperatur 1200 ºC selama 12 jam dalam atmosfer argon. Kemudian paduan di-hot roll dengan preheat selama 1 jam pada temperatur 1250 ºC. Lalu dilakukan proses solution treatment dengan variasi temperatur 1200, 1250, 1300 ºC, selama 30 menit dalam atmosfer argon kemudian di-quenching. Karakterisasi paduan dengan pengamatan metalografi, SEM dan kekerasan memakai metode Vickers. Berdasarkan analisis dapat disimpulkan bahwa nilai kekerasan turun dan morfologi presipitat berubah dari starlike-dense pada kondisi setelah roll menjadi starlike-stripes pada kondisi setelah solution treatment dengan temperatur 1250 ºC, serta jenis presipitat dari M23X6 pada kondisi as cast menjadi M7X3 pada kondisi setelah solution treatment. Demikian halnya dengan nilai kekerasan, turun hingga 392,5 HV pada kondisi solution treatment dengan temperatur 1250 ºC
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Keywords: paduan kobal; material implan; perlakuan panas; solution treatment; presipitat

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