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Trisbenheiser Trisbenheiser
Politeknik Negeri Ujung Pandang
Energy Mechanical Engineering

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Pengaruh Variasi Suhu dan Waktu Pada Proses Nitridasi Terhadap Perubahan Sifat Mekanis Baja St 40 Trisbenheiser Trisbenheiser
Jurnal Teknik Mesin Sinergi Vol 20, No 1 (2022): April 2022
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (359.964 KB) | DOI: 10.31963/sinergi.v20i1.3474

Abstract

This research aimed to determine the changes of strength, micro structure, and wearing out of  St 40 after nitriding process using the urea fertilizers as the sourcse of nitrogen. In this research, the process of nitridation was carried out using the variation of temperature of 4500C, 5000C, and 5500C, and the variation of endurance time of 1 hour, then 3 hours, and 5 hours. The experiment results indicated that the highest hardness value of the steel ST 40 at the temperature of 5500C were consecutively for the endurance time of 1 hour, 3 hours, and 5 hours were 115,46 HB, 116,30 HB, and 116,51 HB.  The increase in the surface hardness of the specimen is affected by the increase in temperature and holding time. Meanwhile, the results of the smallest wearing out of the steel ST 40 at temperature of 5500C with the endurance time 5 hours were consecutively at the wearing out time of 60 minutes, 90 minutes, and 120 minutes were 0,38 mm3/ minute, 0,44 mm3/minute, and 0,57 mm3/minute. The value of the wearing out on the specimen is affected by temperatue and holding time during nitriding.  As for the results of the obsevation using the microscope at the micro structure of stell St 40 after undergoing nitiridation, showed an increase of number of fasa perlite at the specimen surface, the higher the heating temperature the more the fasa perlits formed, this is directly roportional with the hardness of the specimen surface.The fasa perlite formed has better hardness than of fasa ferrite.
Pengaruh Proses Nitriding Terhadap Perubahan Kekerasan Dan Keausan Permukaan Baja St 40 Dengan Variasi Waktu Dan Suhu Trisbenheiser Trisbenheiser
Jurnal Teknik Mesin Sinergi Vol 18, No 2 (2020): Oktober 2020
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (534.171 KB) | DOI: 10.31963/sinergi.v18i2.2310

Abstract

Nitridasi adalah pengerasan permukaan yang bertujuan  untuk meningkatkan sifat mekanik baja terhadap korosi serta keausan. Pada penelitian ini, proses nitriding dilakukan dengan mendifusikan atom-atom nitrida  ke dalam permukaan spesimen melalui proses pemanasan spesimen dengan pupuk urea sebagai penghasil nitrogen. Proses nitriding ini menggunakan variasi suhu pemanasan 4500C, 5000C, dan 5500C dengan variasi waktu penahanan selama 1 jam, 3 jam, dan 5 jam. Dari hasil penelitian serta pengujian didapatkan nilai kekerasan tertinggi 116,30 kg/mm2 HB pada temperatur 550oC dengan lama waktu penahanan 5 jam. Dan untuk hasil keausan material dengan variasi waktu pengausan berbanding lurus nilai kekerasan spesimen. Hasil pengujian struktur mikro speeimen setelah dinitridasi, menunjukkan kenaikan jumlah perlit pada spesimen, yang mana semakin meningkat suhu pemanasannya maka semakin banyak fasa perlit yang terjadi, hal ini berbanding lurus dengan hasil kedalaman difusi yang terjadi. 
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