Kusnadi, SAHWENDI (2013) EFFECT OFHEAT TREATMENT, PENGARUH PERLAKUAN PANAS, VARIASI SUHU TEMPERING DAN LAMA WAKTU PENAHANAN TERHADAP KEKERASAN DAN STRUKTUR MIKRO BAJA PEGAS DAUN KARBON SEDANG (TEMPERINGTEMPERATUREVARIATIONSANDHOLDING TIMEONHARDNESSANDMICROSTRUCTURE OFMEDIUMCARBONSTEELLEAF SPRING). Fakultas MIPA, Universitas Lampung.
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Abstrak (Berisi Bastraknya saja, Judul dan Nama Tidak Boleh di Masukan)
Telahdilakukanpenelitianmengenai pengaruh perlakuan panas, variasi suhu tempering dan lama waktu penahanan terhadap kekerasan dan struktur mikro baja pegas daun karbon sedang. Bahan utama yang digunakan pada penelitian ini adalah pegas daun. Pengambilan data meliputi uji komposisi kimia, kekerasan dan struktur mikro dengan suhuaustenisasi (hardening) yaitu 835 oC dengan waktu tahan 30 menit, serta variasi suhu tempering 425 oC dan 625 oC dengan waktu tahan 40 dan 60 menit. Pengujian kekerasan dilakukan dengan menggunakan metode Rockwell. Hasilujikomposisikimia, menunjukkan bajapegasdaunyang digunakan merupakan bajakarbonsedang(C = 0,57%). Hasiluji kekerasan tertinggi yaitu pada suhu 835 oC, yang merupakan pemanasan hardening yang diikuti dengan pendinginan quench yaitu sebesar 58,2 HRc, sedangkan nilai kekerasan awal hanya 43,1 HRc. Nilai kekerasan tempering dan pengaruh waktu tahan pada umumnya menunjukkan penurunan nilai kekerasan, dimana semakin tinggi suhu tempering dan semakin lama waktu penahanan maka nilai kekerasannya akan semakin kecil. Hasil ini sesuai dengan tujuan awal penelitian yaitu menurunkan nilai kekerasan baja setelah quench, karena baja yang terlalu keras akan mudah rapuh dan patah. Hasil struktur mikro juga menunjukkan perubahan fasa ferit dan perlit sebelum perlakuan panas, menjadi martensit setelah perlakuan panas hardening, dan menjadi martensit temper yang lebih halus dan merata setelah pemanasan tempering. Kata kunci: Perlakuan panas, baja pegas daun, metodeRockwell, kekerasan, tempering, waktu tahan, strukturmikro. (Research has been done on the effect of heat treatment, tempering temperature variations and holding time onhardness and microstructure of medium carbon steel leaf spring. The main materials used in this study areleaf spring. Test data retrieval include chemical composition, hardness and microstructure with temperature austenisasi (hardening) is 835 °C with a hold time of 30 minutes, as well as variations in tempering temperature 425 °C and 625 °C with a hold time of 40 and 60 minutes. Hardness testing do with using Rockwell method. Chemical composition of the test results, showing steel leaf spring used a medium carbon steel (C = 0.57%). Highest hardness test results at a temperature of 835 oC, which is a hardening heating followed by cooling quench by 58.2 HRc, while the initial value of only 43.1 HRc hardness. Hardness values and tempering effect of holding time generally showed a decrease in hardness values, where the higher the tempering temperature and the longer the detention the hardness value will be smaller. These results are consistent with the original purpose of research is to reduce the hardness of steel after quench, because the steel is too hard will be brittle and fracture easily. Microstructure results also showed changes in the phase of ferrite and pearlitebefore heat treatment, to martensiteafter hardening heat treatment, and a tempered martensite finer and evenly after tempering heating. Keywords: heat treatment, steelleaf spring, Rockwellmethod, hardness, tempering,holdtime, microstructure.)
| Jenis Karya Akhir: | Skripsi |
|---|---|
| Subyek: | > Q Science (General) > QC Physics |
| Program Studi: | FAKULTAS MIPA > Prodi Fisika |
| Pengguna Deposit: | UPT Perpustakaan Unila |
| Date Deposited: | 03 Feb 2014 05:07 |
| Terakhir diubah: | 03 Feb 2014 05:07 |
| URI: | http://digilib.unila.ac.id/id/eprint/878 |
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