|About this Abstract
||Materials Science & Technology 2019
||Powder Metallurgy of Light, Reactive and Other Non-ferrous Metals
||Powder Hot Isostatic Pressing of Pure Nb: Influence of Powder Characteristics on the Mechanical Properties
||Alessandro Sergi, Raja Khan, Nicholas JE Adkins, Moataz M. Attallah
|On-Site Speaker (Planned)
In this work, netshape powder hot isostatic pressing (HIPping) of pure Nb was investigated, as an alternative to machining the more expensive C103 alloy for the manufacture of thruster combustion chambers. Particularly, the influence of powder size and oxygen content on the mechanical properties was studied for three different powder size distributions, varying from fine, coarse and wide range, yet all with a faceted morphology. A remarkable difference in microhardness was detected between the coarse and fine powders, suggesting that the oxygen content in the powder has a strong influence on the mechanical properties of HIPped pure Nb. Furthermore, HIPped Nb powders showed high yield and ultimate tensile strength, if compared to conventionally manufactured Nb, while maintaining a good ductility. A structure-property model was developed to rationalise the mechanical properties development. Finally, a demonstrator component was produced and assessed using the optimum HIPping parameters and powder type.