Abstract
In this study a series of gas gun plate impact experiments have been conducted on samples of wire arc AM tantalum to investigate the high strain rate behaviour of the material, including tensile failure (spall) mechanisms. Conventionally processed tantalum was fielded alongside the AM material to provide a direct comparison under identical loading conditions. In-situ velocimetry data was supported by pre-shock characterisation of the samples to supply information on the initial material microstructure, and to link these features to the observed differences in dynamic behaviour. Additional post-shock analysis of the damaged region in the samples provided further insight into the failure process.
Highlights
Recent years have seen rapid developments in the capabilities of additive manufacturing (AM), changes which have the potential to significantly increase the applications for AM components
wire arc AM (WAAM) lacks the ability of powder bed fusion to produce small scale features, it is well-suited for the manufacture of large volume parts
A series of gas gun plate impact experiments have been conducted to investigate the dynamic behaviour of WAAM Ta, and to evaluate the extent of any differences from conventional Ta
Summary
Recent years have seen rapid developments in the capabilities of additive manufacturing (AM), changes which have the potential to significantly increase the applications for AM components. Tantalum samples were produced using a wire arc AM (WAAM) process [1], in which a wire feedstock is melted by an electron beam heat source The use of this technique makes it possible to achieve the temperatures necessary to fully melt the Ta wire over the short timescales required to make it viable for manufacturing part-scale components [2]. A common observation of AM metals is the novel, highly anisotropic microstructure which is produced by the high thermal gradients which are established during the build process This has been shown to influence the mechanical properties of the material [3,4], and can affect the ability to qualify a component for use. Pre- and post-experiment characterisation of the sample provided information on the connection between initial material microstructure and the internal damage nucleation and growth caused by the state of dynamic tensile stress induced in the material
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