Rizkyta, Ara Gradiniar (2026) Analisis Pengaruh Temperatur Perlakuan Panas Terhadap Transformasi Fasa, Mikrostruktur, Ketahanan Korosi, dan Permeasi Hidrogen pada Martensitic Stainless Steel. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Baja tahan karat martensitik (MSS) memiliki kekuatan, kekerasan, dan ketahanan aus yang tinggi, dengan sifat yang sangat dipengaruhi oleh perlakuan panas. Variasi temperatur perlakuan panas mengendalikan transformasi fasa, presipitasi karbida, dan pembentukan austenit sisa, yang selanjutnya memengaruhi sifat mekanik, ketahanan korosi, serta karakteristik difusi hidrogen. Evolusi mikrostruktur akibat tempering, khususnya presipitasi karbida kaya kromium, berperan penting dalam menentukan kemampuan pasivasi dan ketahanan MSS terhadap degradasi akibat hidrogen. Pengaruh perlakuan panas terhadap transformasi fasa, perubahan mikrostruktur, serta interaksi hidrogen pada baja tahan karat martensitik AISI 420 dievaluasi melalui proses austenitisasi pada 1000 °C selama 90 menit, diikuti oil quenching, serta tempering pada temperatur 200, 300, 400, 550, dan 650 °C selama 60 menit dengan pendinginan udara. Karakterisasi material dilakukan melalui pengujian kekerasan mikro Vickers, pengamatan mikrostruktur menggunakan mikroskop optik, analisis fasa menggunakan X-ray diffraction (XRD), serta pengujian permeasi hidrogen dengan metode elektrokimia Devanathan–Stachurski. Hasil pengujian menunjukkan bahwa temperatur tempering berpengaruh signifikan terhadap kekerasan, ketahanan korosi, dan perilaku permeasi hidrogen pada AISI 420. Tempering pada suhu 300 °C memberikan resistansi terbaik terhadap permeasi hidrogen, dengan waktu tunda permeasi terpanjang sebesar 1890 s dan energi aktivasi sebesar 7,9 kJ/mol. Sementara itu, tempering pada suhu 400 °C menghasilkan kekerasan maksimum sebesar 491 HV, meningkat sebesar 31,6% dibandingkan spesimen as-received yang memiliki kekerasan 373 HV, akibat mekanisme secondary hardening. Di sisi lain, tempering pada suhu 650 °C menunjukkan ketahanan korosi terbaik dengan laju korosi sebesar 0,153 mm/tahun. Temuan ini menegaskan pentingnya pemilihan suhu tempering yang sesuai dengan prioritas kinerja pada aplikasi material.
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Martensitic stainless steels (MSS) exhibit high strength, hardness, and wear resistance, with properties that are strongly influenced by heat treatment. Variations in heat-treatment temperature govern phase transformations, carbide precipitation, and the formation of retained austenite, which in turn affect mechanical properties, corrosion resistance, and hydrogen diffusion characteristics. Microstructural evolution induced by tempering, particularly the precipitation of chromium-rich carbides, plays a critical role in determining passivation behavior and the resistance of MSS to hydrogen-induced degradation. The effects of heat treatment on phase transformation, microstructural evolution, and hydrogen interaction in AISI 420 martensitic stainless steel were evaluated through austenitization at 1000 °C for 90 min, followed by oil quenching and tempering at 200, 300, 400, 550, and 650 °C for 60 min with air cooling. Material characterization was conducted using Vickers microhardness testing, microstructural observation by optical microscopy, phase analysis by X-ray diffraction (XRD), and hydrogen permeation testing using the electrochemical Devanathan–Stachurski method. The test results indicate that tempering temperature has a significant effect on the hardness, corrosion resistance, and hydrogen permeation behavior of AISI 420. Tempering at 300 °C provides the best resistance to hydrogen permeation, with the longest permeation lag time of 1890 s and an activation energy of 7.9 kJ/mol. Meanwhile, tempering at 400 °C produces the maximum hardness of 491 HV, representing a 31.6% increase compared to the as-received specimen with a hardness of 373 HV, due to the secondary hardening mechanism. On the other hand, tempering at 650 °C exhibits the best corrosion resistance, with a corrosion rate of 0.153 mm/year. These findings emphasize the importance of selecting an appropriate tempering temperature based on the performance priorities of the material application.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Baja Tahan Karat Martensitik, Perlakuan panas, Struktur Mikro, Permeasi Hidrogen, Martensitic stainless steel, Heat Treatment, Microstructure, Hydrogen Permeation |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA169.5 Failure analysis T Technology > TA Engineering (General). Civil engineering (General) > TA418.42 Hardness properties and tests. Hardness--Testing. T Technology > TA Engineering (General). Civil engineering (General) > TA418.75 Corrosion-resistant materials |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21101-(S2) Master Thesis |
| Depositing User: | Ara Gradiniar Rizkyta |
| Date Deposited: | 03 Feb 2026 07:25 |
| Last Modified: | 03 Feb 2026 07:25 |
| URI: | http://repository.its.ac.id/id/eprint/131976 |
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