PENGARUH NORMALIZING TERHADAP SIFAT MEKANIK BUCKET TOOTH

FAUZAN YARIS, Lilik Dwi Setyana, S.T., M.T.

2018 | Tugas Akhir | D3 TEKNIK MESIN

Batur Jaya merupakan industri yang memproduksi hasil pengecoran di Ceper Klaten. Salah satu produknya adalah bucket tooth excavator yang berfungsi untuk proses penggalian bongkahan batu bara di pertambangan. Produk ini dibuat dari high-manganese carbon steel SAE-AISI number 1541 yang mempunyai ketahanan aus (wear resistant) dan ketahanan impak tinggi. Namun, produk yang dihasilkan Batur Jaya masih memiliki ketahanan aus dan impaknya rendah. Penelitian ini dilakukan dengan tujuan meningkatkan ketahanan aus dan impak pada spesimen bucket tooth excavator melalui proses normalizing temperatur 1000ËšC. Pengujian yang dilakukan meliputi struktur mikro, kekerasan, keausan, dan impak. Hasil penelitian menunjukkan bahwa struktur mikro raw material terdiri dari ferit, perlit dan karbida. Nilai kekerasan dan ketahanan aus tertinggi terdapat pada spesimen raw material dengan nilai 629 VHN dan 7.6x10-5 mm3/kg.m. Kekuatan impak tertinggi terdapat pada spesimen hasil proses normalizing dengan nilai 0.124 J/mm2. Perlakuan panas yang disarankan agar produk bucket tooth lebih awet adalah normalizing.

Batur Jaya, located in Ceper Klaten, is an industry that produces foundry goods. One of its products is a bucket tooth of excavator that is used to pick up chunks of coal at mining. Products made from high-manganese carbon steel SAE-AISI number 1541 which has high wear resistance and high impact resistance. However, the products that produced have low wear resistance and impact resistance. This research is amied to increase wear resistance and impact resistance in bucket tooth escavator specimen through temperature 1000ËšC normalizing process. Tests carried out include microstructure, impact, wear and hardness. The results showed that the micro structure of raw materials consisted of coarse ferrite, pearlite and carbide. The highest hardness and wear resistance value was in raw material specimens with a value of 629 VHN and 7.6x10-5 mm3/kg.m. The highest impact force value was on the specimen with normal normalization with a value of 0.124 J/mm2. The heat treatment that recommended for the research so that bucket tooth products have a high durability is normalizing.

Kata Kunci : bucket tooth, high-manganese carbon steel, normalizing