固溶处理对Inconel 625合金电弧增材组织的影响

GTAW additive manufacturing technology was used for fabricating Inconel 625 alloy thin-wall component. Effects of solution treatment on microstructure and mechanical properties were investigated. It was indicated that the fabricated Inconel 625 sample consists of cellular dendritic which grew epitaxially from the substrate. Laves phase and MC-type carbide were also observed in the microstructure of as-welded sample. Compared with as-welded sample, the microstructure after solution treatment at 680 ℃ shows minimal variation, elements Nb, Mo in Laves phase began to spread to the matrix, therefore δ phase was precipitated alongside with Laves phase. With an increase in solution treatment temperature, the amount of dissolved Laves phase and precipitation δ phase increased. At 1 080 ℃, most Laves particles were dissolved into the matrix, Nb, Mo segregation were relieved, remaining small amount of fine particles are dispersed on the matrix.