Pengaruh Waktu Tempering Terhadap Struktur Kristal, Kekerasan dan Kuat Tarik pada Baja Vcn 150

Haris, Hanrevo Fauzi (2023) Pengaruh Waktu Tempering Terhadap Struktur Kristal, Kekerasan dan Kuat Tarik pada Baja Vcn 150. S1 thesis, Universitas Kristen Indonesia.

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Abstract

Baja VCN 150 termasuk dalam kategori baja ultra high-strength yang memiliki kekuatan sangat tinggi dan memadukan antara hardenability yang baik, keuletan, ketangguhan, dan ketahanan terhadap fatigue dan creep yang tinggi. Penulisan ini memaparkan pengaruh waktu tempering mengenai struktur kristal, kekerasan, serta kuat tarik pada baja vcn 150. Penelitian memakai metode penelitian kuantitatif yang menggunakan metode deskriptif dan studi eksperimental. Pengujian dilakukan melalui pengamatan struktur kristal memakai Difraktometer Sinar-X, uji kekerasan dan kuat tarik dengan Brinell. Hasil menunjukkan bahwa sifat mekanik dan fisik sangat dipengaruhi oleh proses quenching maupun tempering. Kekerasan material mengalami peningkatan setelah proses quenching dari 203 HB ke 393 HB menggunakan media quenching oli. Pada media pendingin air garam dapat meningkatkan kekerasan secara maksimal yaitu dari 203 HB ke 445,3 HB dan mengalami penurunan yang tidak signifikan kembali setelah melalui proses tempering. Penurunan kekerasan dari 445,3 HB ke 324 HB setelah 5 jam tempering. Penurunan ukuran kristal terjadi setelah proses tempering selama 5 jam yaitu dari 0,5766 (nm) ke 0,4725 (nm). Terjadi kenaikan nilai kerapatan diskolasi setelah proses tempering selama 5 jam yaitu 3,0679 (garis/mm²) ke 6,8527 (garis/mm²) begitu pula kenaikan regangan mikro setelah proses tempering selama 5 jam yaitu dari 0,1254 (ε) ke 0,2148 (ε). Kata Kunci: baja vcn 150, tempering, quenching, kekerasan, kuat tarik, struktur kristal. / VCN 150 steel is included in the category of ultrahigh-strength steel which has very high strength and combines good hardenability, ductility, toughness, and resistance to fatigue and creep high. This paper describes the effect of tempering time on crystal structure, hardness, and tensile strength in vcn 150 steel. The research conducted used quantitative research methods using descriptive methods and tal experimental studies. The test is carried out through observation of the crystal structure using X-Ray Difraction, hardness and tensile strength test with Brinell. The results show that the mechanical and physical properties are strongly influenced by the quenching and tempering processes. The hardness of the material increased after the quenching process from 203 HB to 393 HB using oil quenching media. In salt water cooling media can increase the maximum hardness from 203 HB to 445.3 HB and experience an insignificant decrease again after going through the tempering process. Decrease in hardness from 445.3 HB to 324 HB after 5 hours of tempering. The decrease in crystal size occurred after a 5-hour tempering process from 0.5766 (nm) to 0.4725 (nm). There was an increase in the value of discolation density after the 5-hour tempering process from 3.0679 (line/mm²) to 6.8527 (line/mm²) as well as an increase in micro strain after the 5-hour tempering process from 0.1254 (ε) to 0.2148 (ε). Keywords: vcn 150 steel, tempering, quenching, hardness, tensile strength, crystal structure.

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