Abstract
The iron based hardfacing alloys were produced using slag free self-shielded flux cored wires with varying niobium contents. The results show that NbC acted as the nucleus of primary M7(C, B)3 (M = Cr, Fe mainly) carbides and decreased the amount of M7(C,B)3 carbides when niobium was added into the alloys. When 18 wt-%Fe–Nb (60 wt-%Nb) was added, the microstructure of hardfacing alloy transformed from hypereutectic structure to a eutectic one due to the formation of NbC, which consumed a mass of carbon. The microstructure changed into a hypoeutectic structure when the Fe–Nb content was up to 24 wt-%. With the increase in Fe–Nb content, the main abrasive wear mechanism changed from microcracking to microcutting and microploughing due to the formation of NbC and the reduction of primary M7(C, B)3 carbides. The wear loss of the alloy with 18 wt-%Fe–Nb addition was the smallest among all the alloys.
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