Pengaruh Waktu Tahan Post-Heat Dan Laju Pendinginan Proses Copperizing Terhadap Struktur Mikro DanKekerasan Copperized-Api 5l Grade B

Soetrisno, Angga Septa (2016) Pengaruh Waktu Tahan Post-Heat Dan Laju Pendinginan Proses Copperizing Terhadap Struktur Mikro DanKekerasan Copperized-Api 5l Grade B. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Tembaga merupakan salah satu unsur paduan yang dapat meningkatkan kekuatan dan kekerasan baja dengan mekanisme penguatan solid-solution. Dalam penelitian ini, dilakukan pemaduan tembaga dengan baja API 5L grade B menggunakan metode copperizing, yaitu mencelupkan baja API 5L grade B yang telah di pre-heat sebelumnya ke dalam tembaga cair. Selanjutnya dilakukan perlakuan post-heat pada temperatur 1100oC dengan variasi waktu tahan post-heat, yaitu 5, 10 15, dan 20 menit. Setelah diberi perlakuan post-heat, baja kemudian didinginkan dengan variasi laju pendinginan, yaitu annealing, normalizing, dan quenching media air. Setelah itu, dilakukan pengujian struktur mikro, vickers hardness, dan XRD. Pada penelitian ini, didapatkan hasil bahwa lama waktu tahan postheat berpengaruh terhadap struktur mikro copperized-API 5L grade B berdasarkan laju pendinginannya. Pada laju pendinginan annealing terjadi pertumbuhan butir polygonal ferrite. Pada laju pendinginan normalizing, terjadi peningkatan jumlah fase widmanstatten ferrite secara visual pada struktur mikro baja. Pada laju pendinginan quenching terjadi peningkatan ukuran jarum-jarum martensite secara visual pada viii struktur mikro baja. Laju pendinginan proses copperizing juga memberikan pengaruh perubahan struktur mikro copperized-API 5L grade B. Pendinginan annealing menghasilkan fase polygonal ferrite dan pearlite. Pendinginan normalizing menghasilkan fase grain-boundary ferrite, widmanstatten ferrite, acicular ferrite, dan pearlite. Pendinginan quenching menghasilkan fase martensite. Kekerasan copperized-API 5L grade B yang dihasilkan setelah perlakuan post-heat dengan variasi waktu tahan pada proses copperizing adalah: pada laju pendinginan annealing dan quenching, nilai kekerasan turun seiring dengan bertambahnya waktu tahan post-heat, sedangkan pada laju pendinginan normalizing kekerasan bertambah seiring dengan bertambahnya waktu tahan post-heat. Pengaruh laju pendinginan terhadap kekerasan copperized-API 5L grade B adalah: kekerasan tertinggi dicapai oleh spesimen dengan laju pendinginan quenching, sedangkan kekerasan terendah dicapai oleh spesimen dengan laju pendinginan annealing. ============================================================ mechanism. In this research, API 5L grade B is alloyed with copper using copperizing method, by immersing preheated API 5L grade B into molten copper. After that, steel is given a treatment called post-heat at 1100oC with holding time variation, that is 5, 10, 15, and 20 minutes. After post-heat, steel is cooled off with variation of cooling rate (annealing, normalizing, and quenching using water). After that, steel is tested to observed the microstructure, hardness (using vickers hardness), and XRD. In this research, the effect of post-heat holding time to microstructure is based on the cooling rate. In annealing, the polygonal ferrite grains are growth with increasing the holding time. In normalizing, widmanstatten ferrite fraction volume is increased visually in microstructure. In quenching, the lath martensite become bigger visually in microstructure. Effect of cooling rates are: in annealing, the formed phase are polygonal ferrite and pearlite. In normalizing, the phase are grain boundary ferrite, widmanstatten ferrite, acicular ferrite, and pearlite. In quenching, the phase is martensite. The hardness of copperized-API 5L grade B after post-heat treatment is: in annealing and quenching the hardness x is decreased but in normalizing the hardness is increased with increasing post-heat holding time. The effect of cooling rates toward hardness of copperized-API 5L grade B are: the highest hardness is achieved by specimen with quenching cooling rate and the lowest hardness is achieved by specimen with annealing cooling rate.

Item Type: Thesis (Undergraduate)
Additional Information: RSMt 620.182 Soe p
Uncontrolled Keywords: API 5L grade B, copperizing, post-heat, laju pendinginan.
Subjects: T Technology > TN Mining engineering. Metallurgy
T Technology > TN Mining engineering. Metallurgy > TN690 Metallography. Physical metallurgy
Divisions: Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User: EKO BUDI RAHARJO
Date Deposited: 17 Oct 2019 04:00
Last Modified: 17 Oct 2019 04:00
URI: http://repository.its.ac.id/id/eprint/71240

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