Pengaruh Temperatur Austenisasi terhadap Struktur Mikro dan Nilai Kekerasan Material 14%Cr-3%Ni-2%Mo-2%C untuk Aplikasi Bola Gerus

Abstrak

This study was conducted to determine the effect of heat treatment in the form of sub-critical, austenization, quenching and tempering the hardness values of the white cast iron material as consideration for testing wear resistance of local and foreign products as grinding balls. Samples was treated sub-critical at a temperature of 700C with a hold time of 2 hours and continued with austenization temperature variation of 850, 950 and 1050C with a hold time of each sample is 5 hours. The optimum hardness value was obtained at a temperature of 950C austenization in the amount of 68.3 HRC and decreased at a temperature of 1050C. It is because the solubility of carbon elements making up the matrix. Next will be tempering at a temperature of 250C and holding time 2 hours hardness values decreased but the value of wear resistance is obtained even better ie grinding balls of 0.03 g/kg of product due to the combination of its constituent elements, namely chromium-molybdenum and nickel are high the presence of wear phenomena induced martensite.