Microstructure and properties of joints of titanium and C45 non-alloy quality steel performed using aluminum, copper and nickel foils as interlayers were evaluated in the study. The process was carried out in vacuum in the temperature 600, 900 and 950 C for 60 min for Al, Cu and Ni filler metals, respectively. The effect of used filler metal on the joints microstructure, composition, hardness and tensile properties were analyzed by means of optical and scanning electron microscopy (SEM), electron probe microanalyses and mechanical tests. When aluminum was used as a filler metal FeAl2, Fe2Al5, FeAl3, TiAl3, TiAl2 and TiAl intermetallic phases were formed. When copper was used as a filler metal, the phases present in joint were: Fe2Ti, FeTi, Cu3Ti2, Cu4Ti3, CuTi and CuTi2 containing additionally small amounts of Fe. When nickel was used as a filler metal at the steel/nickel interface Fe2Ti and FeTi were formed due to diffusion of Ti through nickel layer. At the nickel/titanium interface, the layer of NiTi2 was observed and the irregular shaped particles of Ni3Ti. The maximum hardness values in the range of HV 506 to 870 were achieved at the steel/aluminum interface due to the presence of the Fe2Al5 and FeAl3 intermetallic phases. The maximum hardness values at the metal/titanium interface were achieved for nickel filler metal due to the presence of the NiTi2 and Ni3Ti intermetallic phases and they were in the range of HV 380 to 480. The maximum bond tensile strength was obtained for copper filler metal and averagely was 245 MPa, with 4.2% elongation.Keywords: Titanium, carbon steel, microstructure, mechanical properties
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