Studi Eksperimen Proses Interrupted Quenching Pada Friction Wedge Dengan Variasi Media Quenching

Ashari, Azhar (2015) Studi Eksperimen Proses Interrupted Quenching Pada Friction Wedge Dengan Variasi Media Quenching. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Friction wedge merupakan peredam kejut (damper) pada bogie kereta api yang berfungsi untuk meredam hentakan yang timbul saat kereta berjalan. Friction wedge bekerja dengan cara bergesekkan dengan side frame yang telah diberi plat mangan. Bahan dasar friction wedge adalah baja AISI 1340 yang dibentuk melalui proses pengecoran. Peningkatan kekerasan dan ketahanan aus dilakukan agar life-cycle dari friction wedge panjang. Peningkatan kekekerasan dapat dilakukan melalui proses quenching, salah satu modifikasi dari proses quenching adalah proses interrupted quenching. Proses perlakuan panas interrupted quenching dilakukan pada benda uji friction wedge yang telah dibentuk sesuai standar pengujian, dengan pemanasan dalam dapur sampai mencapai temperatur austenisasi 830⁰C dan waktu tahan 2 jam. Proses dilanjutkan dengan penahanan benda uji di media udara selama 20 detik. Setelah penahanan di udara, benda uji diquenching pada media quenching masing-masing air, oli, dan polimer. Pengujian yang dilakukan setelah proses interrupted quenching antara lain, uji metallography, uji kekerasan, uji impak, dan uji keausan. Pada penelitian ini didapatkan bahwa media quenching air adalah media quenching yang optimum pada proses interrupted quenching, dengan peningkatan kekerasan sebesar 195% dari benda uji as cast, peningkatan impact strength sebesar 3% dari benda uji as cast, dan struktur mikro yang dominan adalah v martensite. Pengujian keausan yang digunakan pada penelitian ini perlu dilakukan evaluasi. ==================================================================================================== Friction wedge is shock absorber (damper) on train’s bogie that has function to absorb shock or impact when train moves. Friction wedge works by rubbing with side frame that coated with mangan’s plate. Base material of friction wedge is AISI 1340 steel that made from casting. Hardness increment and wear resistance is used to increase life-cycle of friction wedge. Quenching process is used to increase hardness, one of the modified quenching process is interrupted quenching. Heat treatment of interrupted quenching is applied to friction wedge that has made as test standards, by heating in furnance until austenitized temperature 830⁰C and holding time 2 hours. After holding time, specimen is put on free air for 20 seconds. After that, specimen is quenched on quenching media variant respectively water, oil, and polymer. Tests that used on this study are, impact test, hardness test, metallography test, and wear resistance test. On this study, it is found that quenching water is optimum quenching media for interrupted quenching process, with hardness increement 195% from as cast, wear resistance increement 25% from as cast, impact strength increement 3% from as cast, and dominant micro structure is martensite. Wear resistance test that used on this study need to be evaluated.

Item Type: Thesis (Undergraduate)
Additional Information: RSM 671.36 Ash s
Uncontrolled Keywords: friction wedge, bogie, interrupted quenching, media quenching
Subjects: T Technology > TS Manufactures > TS699 Powder coating of metals
Divisions: Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User: Mr. Marsudiyana -
Date Deposited: 17 Dec 2019 06:45
Last Modified: 17 Dec 2019 06:45
URI: http://repository.its.ac.id/id/eprint/72399

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