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This research was funded in the framework of the project Lublin University of Technol-
ogy—Regional Excellence Initiative, funded by the Ministry of Science and Higher Education of
Poland (contract no. 030/RID/2018/19) and the Key State Laboratory for Strength and Vibrations,
Xi’an Jiaotong University.
This paper focuses on the microstructure and tribological properties of novel hardfacing
alloy based on Fe-C-Mn-B doped with Ni, Cr, and Si. The 4 mm-thick coating was deposited on the
AISI 1045 carbon steel by the MIG-welding method using flux-cored wires in three passes. The tran-
sition zone thickness between the weld layers was ~80 μm, and the width of the substrate-coating
interface was 5–10 μm. The following coating constituents were detected: coarser elongated M 2 B
borides, finer particles of Cr 7 C3 carbides, and an Fe-based matrix consisting of ferrite and austenite.
The nanohardness of the matrix was ~5–6 GPa, carbides ~16–19 GPa, and borides 22–23 GPa. A high
cooling rate during coating fabrication leads to the formation of a fine mesh of M 7 C3 carbides; bo-
rides grow in the direction of heat removal, from the substrate to the friction surface, while in the
transition zone, carbides become coarser. The dry sliding friction tests using a tribometer in PoD
configuration were carried out at contact pressure 4, 7, 10, and 15 MPa against the AISI 1045 carbon
steel (water-quenched and low-tempered, 50–52 HRC). The leading wear phenomenon at 4 and 7
MPa is fatigue, and at 10 and 15 MPa it is oxidation and delamination.
