DEVELOPMENT OF FERRO-ALLOY HARDFACING FOR HIGH ABRASION AND LOW IMPACT WEAR APPLICATIONS

• Chijioke Okechukwu

  English

  Author

• Olurotimi Akintunde Dahunsi

  English

  Author

Extension of service lives of critical machine components subjected to wear is possible through
application of hardfacing alloys. In this work, two hardfacing alloys were produced based on the mass
ratios of 2: 1: 1 and 7: 1.5: 1.5 for Fe: Mn: Cr by sand and open permanent mold casting processes,
respectively. XRD analysis of both samples showed the prominent presence of (Mn, Cr)23C6, (Fe, Mn,
Cr)7C3, Cr3C2, Fe3C2 and Fe4C carbides. Hӓgg carbide was prevalent in the SEM microstructural
analysis of the sand cast sample, while cementite dominated the permanent mold cast sample. The
average hardness values, impact energies absorbed and wear volumes of the samples produced with
their respective charge mass ratios are 567 HV, 30 J and 0.131 cm3 for 2: 1: 1 ratio and 592 HV, 29.5 J
and 0.085 cm3 for the 7: 1.5: 1.5 ratio. For service life applications as jaws, rolls, mantles, and concaves
in crushers, the latter was recommended for manual metal arc welding to low carbon steel substrate
because of its higher hardness, lower wear volume and cheaper alloy cost.

• pdf