title: PENGARUH HOLDING TIME PADA PROSES ANNEALING TERHADAP  NILAI KEKERASAN DAN KETANGGUHAN BESI COR KELABU FC25
creator: Meilisa , Putri Utami
subject: 620 Ilmu teknik dan ilmu yang berkaitan
description: Besi Cor Kelabu FC25 adalah salah satu material baja karbon tinggi yang sedang  banyak digunakan sebagai bahan utama pada pembuatan elemen mesin seperti  sambungan perpipaan, poros, engkol, roda gigi, landasan mesin. Penelitian ini  bertujuan untuk mengetahui pengaruh lama waktu holding time pada proses  annealing terhadap sifat mekanik dan struktur mikro Besi Cor Kelabu FC25.  Penelitian ini menggunakan spesimen berupa Besi Cor Kelabu FC25 yang  diberikan perlakuan panas annealing dengan temperatur 850°C dengan variasi  holding time 30 menit, 60 menit dan 120 menit, kemudian didinginkan secara  lambat didalam furnace selama 30 jam. Selanjutnya dilakukan pengujian kekerasan  metode Vickers dan pengujian impak metode charpy. Hasil uji kekerasan  didapatkan nilai kekerasan sebelum dilakukan perlakuan panas sebesar 154,739849  kg/mm2. Hasil uji kekerasan setelah dilakukan perlakuan panas annealing dengan  holding time 30 menit, 60 menit dan 120 menit sebesar 152,662722 kg/mm2,  148,797411 kg/mm2, 143,470735 kg/mm2. Hasil pengujian impak didapatkan  energi impak sebelum dilakukan perlakuan panas adalah sebesar 3 Joule. Hasil  energi impak setelah dilakukan perlakuan panas annealing dengan holding time 30  menit, 60 menit dan 120 menit sebesar 3,8 Joule, 4,06 Joule, 4,3 Joule. Pada  pengamatan struktur mikro menggunakan Optical Microscopy (OM) menunjukkan  perubahan fasa grafit flake menjadi grafit nodular dengan butir yang lebih besar.    Kata kunci : Beci Cor Kelabu FC25, Annealing, Holding Time, kekerasan,  ketangguhan dan OM.    ABSTRACT    THE EFFECT OF HOLDING TIME IN THE ANNEALING PROCESS ON  THE HARDNESS AND IMPACT STRENGTH OF FC25 GRAY CAST    IRON  By  Meilisa Putri Utami    FC25 Gray Cast Iron is a high carbon steel material that is widely used as the main  material in the manufacture of machine elements such as pipe fittings, shafts,  cranks, gears, and machine beds. This study aimed to determine the effect of  holding time during the annealing process on the mechanical properties and  microstructure of FC25 Gray Cast Iron. This research used FC25 Gray Cast Iron  specimens that were heat treated with annealing at a temperature of 850°C with  holding time variations of 30 minutes, 60 minutes, and 120 minutes, then slowly  cooled in the furnace for 30 hours. Subsequently, Vickers hardness testing and  Charpy impact testing were carried out. The hardness test results showed a hardness  value of 154.739849 kg/mm2 before heat treatment. The hardness test results after  annealing heat treatment with holding times of 30 minutes, 60 minutes, and 120  minutes were 152.662722 kg/mm2, 148.797411 kg/mm2, and 143.470735 kg/mm2,  respectively. The impact test results showed an impact energy of 3 Joules before  heat treatment. The impact energy results after annealing heat treatment with  holding times of 30 minutes, 60 minutes, and 120 minutes were 3.8 Joules, 4.06  Joules, and 4.3 Joules, respectively. Optical Microscopy (OM) observation of the  microstructure showed a transformation of the graphite flake phase to a nodular  graphite phase with larger grains.    Keywords: FC25 Gray Cast Iron, Annealing, Holding Time, hardness, toughness,  and OM.
publisher: FAKULTAS TEKNIK
date: 2024-05-21
type: Skripsi
type: NonPeerReviewed
format: text
identifier: http://digilib.unila.ac.id/83075/1/ABSTRAK%20SKRIPSI%20_MEILISA%20PUTRI%20UTAMI%202015021024%20-%20meilisa%20meilisa.pdf
format: text
identifier: http://digilib.unila.ac.id/83075/2/SKRIPSI%20%20FULL%20MEILISA%20PUTRI%20UTAMI%202015021024%20-%20meilisa%20meilisa.pdf
format: text
identifier: http://digilib.unila.ac.id/83075/3/SKRIPSI%20TANPA%20PEMBAHASAN%20MEILISA%20PUTRI%20UTAMI%202015021024%20-%20meilisa%20meilisa.pdf
identifier:   Meilisa , Putri Utami  (2024) PENGARUH HOLDING TIME PADA PROSES ANNEALING TERHADAP NILAI KEKERASAN DAN KETANGGUHAN BESI COR KELABU FC25.  FAKULTAS TEKNIK, UNIVERSITAS LAMPUNG.     
relation: http://digilib.unila.ac.id/83075/