3.3. Two-body abrasive wear behavior of Fe–3.0 wt% B cast alloy
Fig. 11 shows the two-body abrasive wear rates of Fe–3.0 wt% B cast alloys with different Cr additions under contact loads of 15, 35 and 55 N. As shown in Fig. 11, wear rate of Fe–3.0 wt% B cast alloy under each contact load falls firstly and then rises with increasing Cr addition. And the variation trend of wear rate is exactly opposite to that of fracture toughness of M2B. Moreover, the minimum value is acquired at 2.0 wt% Cr, which is similar with fracture toughness of M2B. In other words, wear resistance of Fe–3.0 wt% B cast alloy is closely related to fracture toughness of M2B. On the other hand, when the contact load increases, wear rates of Fe–B cast alloy increases obviously. Simultaneously, the variation trend of wear rate with increasing Cr addition is not so obvious as that under low contact load.