Investigation on abrasive wear behavior of Fe-B alloys containing various molybdenum contents

摘要

Two-body abrasive wear behavior and mechanism of Fe-B alloys with different Mo contents have been systematically investigated. The results show that the Mo addition can promote the formation of Mo-rich and Cr-rich M2B in Fe-B alloys, and the Mo-rich and Cr-rich M2B possess the higher H (hardness) and delta(A) (plasticity factor) compared to the Fe-rich M2B. Meanwhile, with the increase of Mo content, the VMo+Cr/V-Fe increases slightly firstly and then increases rapidly (Where the V-Mo, V-Cr and V-Fe represents the volume fractions of Mo-rich, Cr-rich and Fe-rich M2B, respectively, and the VMo+Cr shows the volume fractions of V-Mo and V-Cr). The wear results reveal that the wear rate decreases greatly with the increasing VMo+Cr/V-Fe especially when the VMo+Cr/V-Fe < 0.42. During the two-body wear process, the main wear mechanism is microcutting, and the Mo-rich and Cr-rich M2B provide better resistance to the SiC abrasive relative to the Fe-rich M2B. In this case, the increasing VMo+Cr/V-Fe induced by the Mo addition contributes to the improvement of the abrasion resistance of Fe-B alloys effectively.