Here, we report the utilisation of a powder-bed-fusion additive manufacturing to achieve CMSX-4 single-crystal repair with René N5 powders. The is characterised by fine columnar dendritic substructure, limited in-grain misorientation over tens millimetres in height, and strong deposit-to-substrate bonding. brighter contrast region 300 400 μm thick, formed cellular solidification front, sits abo...

Abstract Channel segregation – known as freckle is one of the most complex defects which severely limit mechanical properties investment cast single-crystal turbine blades. The phenomenon induced by thermal-solutal-fluid flow instability during solidification process; it therefore important to gain better understanding fluid flow, heat transfer and species transport casting process. In this wor...