Microstructure and Properties of Deloro 50 Alloy Layer Deposited on H13 Steel by Electro Spark Deposition

Deloro 50 alloy layer was deposited on H13 steel by electro spark deposition(ESD) process, and the microstructure and phase compositions of Deloro 50 alloy layer were characterized by scanning electronic microscope(SEM) and X-ray diffractionmeter(XRD) and the alloy layer hardness was tested by a microhardness tester. The results show that excellent metallurgical bonding between the alloy layer and the substrate was obtained by ESD. The alloy layer had an average thickness of about 35 μm. The microstructure of the alloy layer was mainly composed of FeNi3, Ni3(CrFe) and C6(Co,Cr,Ni)23 phases. The microhardness of the surface layer was 954.4 HV0.05 which was two times of hardness of the substrates.