Microstructure characterisation of Ti-6Al-4V from different additive manufacturing processes

International Materials Research Meeting in the Greater Region: "Current Trends in the Characterisation of Materials and Surface Modification"

Neikter, M.^1 ; Åkerfeldt, P.^1 ; Pederson, R.^2 ; Antti, M.-L.^1

Division of Materials Science, Luleå University of Technology, Luleå

971 87, Sweden^1

Division of Welding Technology, University West, Trollhättan

461 32, Sweden^2

关键词: Additive manufacturing process;    Cooling rates;    Directed energy;    Fusion process;    Microstructure characterisation;    Powder bed;    Ti-6 Al-4 V;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/258/1/012007/pdf
DOI  :  10.1088/1757-899X/258/1/012007

来源: IOP

【 摘 要 】

The focus of this work has been microstructure characterisation of Ti-6Al-4V manufactured by five different additive manufacturing (AM) processes. The microstructure features being characterised are the prior β size, grain boundary α and α lath thickness. It was found that material manufactured with powder bed fusion processes has smaller prior β grains than the material from directed energy deposition processes. The AM processes with fast cooling rate render in thinner α laths and also thinner, and in some cases discontinuous, grain boundary α. Furthermore, it has been observed that material manufactured with the directed energy deposition processes has parallel bands, except for one condition when the parameters were changed, while the powder bed fusion processes do not have any parallel bands.