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The influence of molybdenum on the boronising behaviour of iron (with addition of 1, 2, 4, 8 and 16 wt-% Mo) was investigated by performing pack boronising at 1100°C for 3 h. The borided samples were characterised using SEM-EDS, EPMA, XRD, microhardness tester and profilometer. FeB and Fe 2 B polyphase exists in all boronised pure Fe and Fe-Mo alloys. Mo 2 FeB 2 precipitates were detected in the boride layer and transition zone. The increasing content of Mo in Fe-Mo alloys resulted in a decrease in the boride layer thickness. The average microhardness value of boride layers formed on pure Fe and Fe-16Mo alloys were measured as 1750 and 2050 HV, respectively, while approximate microhardness value of Mo 2 FeB 2 precipitates was measured as 2600 HV. It was also observed that the increasing Mo content in Fe-Mo alloys resulted in an increment in the surface roughness from approximately 0.8 to 2.7 μm.

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