Abstract
This study aims to obtain information about the price of tensile, hardening , and changes in microstructure as well as changes in material properties at hot temperature variations 800 O C to 900 O C. The method used in this study is an experimental method, where the material used is ST - 60 steel bolts, with a tensile test sample form referring to the ASTM D 638-03 standard, while for testing hardness and chemical composition based on machine standards, namely Ø16 mm x 20 mm. In this study, 5 samples were made at each temperature of 0 0 C, 800 0 C, 850 0 C, 900 0 C, 950 0 C and 1000 0 C with the type of heat treatment in the normalizing process and the hardening quenching process. This research was conducted in the Laboratorium Pengujian Bahan, Jurusan Teknik Mesin, Politeknik Negeri Pontianak . The test results on the normalizing process for tensile strength decreased by an average of 230.78 N/mm 2 or 50%, Vickers hardness decreased by an average of 33.99 HV or 31% and the carbon content decreased by an average of 0.19 or 48% of the normalizing process is not done. Whereas in the hardening quenching process, the average tensile strength increased by 93.22 N/mm 2 or 20 %, the Vickers hardness on average increased by 19.29 HV or 18 % and the average carbon content increased by 0.06 or up 17 % of the hardening quenching process was not done. So to overcome the decrease in mechanical strength and changes in the microstructure of the ST-60 bolt due to hot temperatures, the hardening quenching process can be applied, namely by polishing with used oil after the bolts work at hot temperatures.
Highlights
Penelitian ini bertujuan untuk memperoleh informasi tentang harga kekuatan tarik, kekerasan, dan perubahan struktur mikro serta perubahan dari sifat bahan pada variasi temperatur panas 800OC sampai 900OC proses normalizing dan proses hardening quenching
This study aims to obtain information about the price of tensile, hardening, and changes in microstructure as well as changes in material properties at hot temperature variations 800 OC to 900 OC
[18] Book Standard ASTM D638-03 (2003), Standard Test Method For Tensile Properties Of Plastics
Summary
Baja adalah logam paduan besi (Fe) sebagai unsur dasar dan karbon (C) sebagai unsur paduan utamanya. Kandungan karbon dalam baja berkisar antara 0,2 – 2,1% dari berat grade-nya. Fungsi karbon dalam baja adalah sebagai unsur pengerasan pada kisi kristal atom besi. Baja karbon adalah baja yang mengandung karbon lebih kecil 1,7 %, sedangkan besi mempunyai kadar karbon lebih besar dari 1,7 %. Baja mempunyai unsur-unsur lain sebagai pemadu yang dapat mempengaruhi sifat dari baja. Penambahan unsur-unsur dalam baja karbon dengan satu unsur atau lebih, bergantung pada karakteristik baja karbon yang akan dibuat [4]
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