Abstract: Since the mold inserts are prone to failure in service processes, this study proposed a new method for preparing mold inserts. Ni-Cr-B-Si alloy powders specially manufactured were processed by selective laser melting (SLM) with different parameters in this research to obtain metal parts for mould repairing. It has been found that both the surface quality and relative density of the metal parts were improved with the increase of laser energy input. The metal part samples with fine surface roughness (Ra≤3.5 μm) and high relative density (98.6%) were obtained. Rapid melting and solidification in the SLM process resulted in fine gains and microstructures of the metal parts. The main phases of the microstructures included FeNi3, γ-Ni and Ni3Si, etc. and the strengthening phases such as M7C3, M23C6 and Cr2B in the SLM samples. The combination of fine grains with strengthening phases contributes to the excellent mechanical properties of the metal parts. The average microhardness of the SLM prepared metal parts could reach 848.1HV0.5. Correspondingly, the wear resistance of the metal parts was much better than that of the common hot-work die steel H13 under the same test conditions.
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2020, Vol. 34 
