Effects of niobium macro-additions to high chromium white cast iron on microstructure, hardness and abrasive wear behaviour

Effects of niobium macro-additions to high chromium white cast iron on microstructure, hardness and abrasive wear behaviour

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Abrasive wear is a principal cost in mining and mineral processing operations.High chromium white cast iron (WCI) further reinforced with niobium carbide (NbC) shows promise to Zanussi ZOA35675XK Side-opening Single Fan Oven With Programmable Tim increase component wear lives.This work investigates the effect of niobium macro-additions on microstructure, hardness and high-stress abrasive wear behaviour of Nb-containing high-Cr WCIs.Eight alloys with Nb between 0 and 10.7 wt% were produced by sand casting.

Increasing niobium carbide volume fraction (Nb-CVF) increased hardness from 724 to 812 HV (7.3 HV per 1% Nb-CVF).Abrasive wear resistance, assessed using the ball mill abrasion test in basalt (less competent) and quartzite (competent rock), showed clear beneficial effect of NbC macro-addition up to 11.4 and 7 vol% ROSEMARY CONDITIONING HAIR OIL in basalt and quartzite, respectively.These correspond to life improvements of 37% and 7% per 1% Nb-CVF in the optimum range of Nb macro-addition, in basalt and quartzite respectively.

Micro-mechanistic observations of worn surfaces showed that NbC particles not only protrude from the matrix but do so more than Cr-rich M7C3 carbides.In deep wear grooves created by quartzite, M7C3 particles were cut flush with the matrix, whereas NbC protruded, visibly impeding the progress of the abrasion event.