The effects of tungsten additions of 0%, 1.12%, 2.04%, and 3.17% (in wt.%) on the morphology,
fracture toughness and micro-hardness of Fe2B in Fe–B–C cast alloy were investigated. The
results indicate that, with the increase of tungsten addition, themorphology and distribution
of Fe2B have no change and a new W-containing phase, except the (Fe, W)2B with a certain
tungsten solution, does not form, and that the fracture toughness of Fe2B increases first and
then decreases,while the hardness increases first and then has a little change. Compared with
the fracture toughness (3.8 MPa·m1/2) of Fe2B without tungsten addition, the toughness at
2.04 wt.% tungsten can be improved by about above 80%and achieves about 6.9 MPa·m1/2, and
variation characteristics of hardness and toughness of Fe2B were also testified by viewing the
indentation marks and cracks on the Fe2B, respectively.