Investigation on microstructure characteristics of Ti-48Al alloy fabricated using twin-wire directed energy deposition-plasma arc
Ti-48Al alloy is fabricated successfully using plasma arc powred twin wire-directed energy deposition-arc,and its microstructure characteristic before and after heat treat-ment is systematically investigated.The results show that as-deposited Ti-48Al alloy consists of α2 and γ phase.The micro-structure is characterized by the alternatively distributed dend-ritic grain and fully lamellar colony along the building direc-tion for as-deposited Ti-48Al alloy,and there is interdendritic Al element segregation in the dendritic grain region.After heat treatment in 1 340℃/10 h/furnace cooling,the duplex micro-structure with fine grain size is obtained,and the microstruc-ture heterogeneity is significantly improved,the α2 phase con-tent is obviously increased,the preferred orientation of micro-structure is also weakened.
directed energy deposition-arcTiAl alloymi-crostructureheat treatment
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