Impact of chemical composition on precipitate morphology in an additively manufactured nickel base superalloy

摘要: Abstract Changes in the iron content within allowable composition range Inconel® 625 produce significant differences grain size and mechanical properties during laser-based directed energy deposition additive manufacturing. The resulting precipitate types morphologies, which contribute to these different properties, originate from a complex interplay between iron, silicon, titanium. While addition of has traditionally been shown promote Laves phase formation, thermodynamic calculations have that silicon contents excess 0.05 wt% are also required its formation. For example, relatively low (1 wt%), titanium (0.019 wt%), high (0.37 wt%) led formation phase. On other hand, (4 wt%), (0.19 wt%), (0.035 wt%) MN nitrides no By increasing concentration, precipitation rich niobium is promoted liquid, suppressed solidification. After hot isostatic pressing, distribution displayed minimal with found as-deposited condition for both material chemistries. However, precipitates grew larger developed blocky morphology while original partially transformed M2N Nb, Cr, Mo. In material, became depleted further enriched maintaining similar those condition.