The role of boron content in high alloy white cast iron (Ni-Hard 4) on microstructure, mechanical properties and wear resistance


ÇÖL M. , KOÇ F. G. , ÖKTEM H. , KIR D.

WEAR, cilt.348, ss.158-165, 2016 (SCI İndekslerine Giren Dergi)

Özet

High alloy white cast iron materials (Ni-Hard 4/ASTM A532) are widely used in cement, concrete and mining industries due to high wear resistance. In this study, the effect of boron on the microstructure, mechanical properties and wear resistance in white cast iron containing different contents of boron was investigated. For this purpose, ferro-boron was used during cast that boron will occur with the contents of 0.26%, 0.37%, 0.49% and 0.55% in the material. Specimens were austenitized at 850 degrees C for 5 h, quenched in air and tempered at 250 degrees C for 4 h. Wear tests were carried out using a pin-on-disctribometer under dry sliding conditions. Three-point bending tests were performed to determine the toughness properties. Microstructure, fracture and worn surfaces were investigated with scanning electron microscope. The results show that amount of carbide increases as boron content increases. This situation provides positive contribution on materials hardness and wear resistance. Toughness properties decrease as the boron content increases. (C) 2015 Elsevier B.V. All rights reserved.