Microstructure characteristics of Inconel 625 alloy by MIG arc additive manufacture
MIG arc additive manufacturing technology was used to prepare Inconel 625 alloy surfacing layer.The transition characteristics and pool behavior of nickel-based alloy droplets were studied using a high-speed camera system,and the microstructure,phase composition and distribution of the characteristics of phase at different positions were analyzed.The results showed that the microstructure of the surfacing layer was primarily composed of columnar dendrites with certain orientation,with small cellular crystals at the bottom.As the number of surfacing layers increased,the main stems of the dendrites became thicker and had secondary branches.The surfacing layer was composed of y-Ni solid solution,bright irregular Laves phasea and black granular MC carbides.The distribution of the precipitated phases in different positions was also different.The Laves phases at the bottom and top of the surfacing layer were diffusively distributed,while the Laves phases in the middle and upper layers were distributed in a chain pattern along the dendrite growth direction.Microhardness showed that the hardness of the lower part of the surfacing layer was relatively high,and the overall trend along the stacking direction was decreasing.
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