Al Audhah, Lutfi Yunus Wahab (2018) Simulasi Distribusi Temperatur Pada Proses Pengerasan Baut Baja S45C Untuk Optimasi Kadar Struktur Mikro Martensit Menggunakan Metode Elemen Hingga. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Hardenability adalah ukuran kualitas dari suatu material untuk dapat dikeraskan, dalam hal ini adalah kemampuannya untuk dapat membentuk martensit minimal 50 %. Baja dengan hardenability tinggi akan memberikan keuntungan bila digunakan untuk membuat benda kerja berpenampang besar yang akan dikeraskan (hardened & tempered) sampai ke intinya (through hardened). Dalam kasus ini PT. Timur Megah Steel mengalami kegagalan dalam memenuhi standar dalam proses pembuatan baut dengan proses hardening yang terkhusus pada produk pasar ekspor Eropa. Dimana, kadar struktur mikro martensit pada baut yang diharuskan untuk memasuki pasar Eropa adalah tak kurang dari 90%. Untuk upaya analisa kegagalan dan solusi dari permasalahan tersebut diakukan pelaksanaan penelitian dengan simulasi distribusi temperatur menggunakan metode elemen hingga pada geometri baut tersebut. Simulasi dilakukan pada proses pemanasan objek dengan temperatur sesuai proses manufaktur di PT. Timur Megah Steel yaitu 8500 C selama 1 jam. Selanjutnya simulasi pada proses hardening ini dilakukan pendinginan cepat dengan media oli (oil quench) dan selanjutnya dilanjutkan dengan proses tempering dengan temperatur tempering 4500 C selama 30 menit. Simulasi dilakukan berdasarkan distribusi temperatur terhadap waktu pada objek baut saat proses pengerasan serta pada proses tempering. Hasil analisis distribusi thermal pada variabel proses tersebut, kemudian dikorelasikan terhadap kadar martensit yang didapatkan dengan pendekatan menggunakan analisis struktur mikro martensit terhadap temperatur transformasinya pada Cooling Curve Transformation (CCT- diagram) serta dari nilai kekerasan baut berdasarkan mikrostruktur martensitenya.
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Hardenability is a measure to the quality of a material to be hardened, in this case, its ability to form a martensite at least 50%. High hardenability steel will provide an advantage when used to make a large hardened & tempered workpiece (through hardened). PT. Timur Megah Steel fails to fulfil the standard in the process of manufacturing bolts with hardening process that is specialized in the products of European export markets. Where, the martensite microstructure level in the bolts required to enter the European market is no less than 90%. For the effort of the failure analysis and solution of the problem is carried out the implementation of the research by simulating the temperature distribution using finite element method on the geometry of the bolt. Simulation is done on the process of heating the object with temperature according to the manufacturing process at PT. Timur Megah Steel is 8500C for 1 hour. Furthermore, simulation on cooling process is done by rapid cooling with oil (oil quench) and then proceed with tempering process with tempering temperature 4500 C for 30 minutes. The simulation is based on temperature distribution over time (transient) on bolt object during hardening process and tempering process. The results of thermal distribution analysis, based on the process variables above, we correlated it to the martensite content obtained using analysis of martensite micro structure to their transformation temperature on Cooling Curve Transformation (CCT-diagram) and also hardness value of bolts based on their martensite microstructure.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSMt 671.36 Ala s-1 3100018074251 |
| Uncontrolled Keywords: | Baja S45C, Distribusi temperatur, Martensit, Metode elemen hingga |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TN Mining engineering. Metallurgy > TN752.I5 Steel--Heat treatment |
| Divisions: | Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Lutfi Yunus Wahab Al-Audhah |
| Date Deposited: | 19 Feb 2018 07:41 |
| Last Modified: | 28 Apr 2020 22:46 |
| URI: | http://repository.its.ac.id/id/eprint/49277 |
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