Wear behaviour of hardfacing deposits on cast iron

The abrasive wear behaviour of different hardfacing electrodes deposited on grey cast iron used for the top bearing plate of a coal crushing unit was studied using the dry sand rubber wheel abrasion test. The results show that different hardfacing electrodes as well as the weld procedure variation using similar electrodes have large effects on low stress abrasion resistance of the deposit. Such effects on the abrasion resistance are mainly attributed to the variation in deposit chemistry and microstructures. Carbon content is an important factor determining microstructure of such hardfacing electrodes and therefore wear resistance. Furthermore, the wear behaviour also indicated that the abrasive wear resistance is not simply related to the hardness of the deposit but is determined by the carbides and matrix structure of the deposits.