Authors
MSKKY Nartu, S Dasari, A Sharma, SA Mantri, Shashank Sharma, Mangesh V Pantawane, B McWilliams, K Cho, Narendra B Dahotre, R Banerjee
Publication date
2021/7/21
Journal
Materials Science and Engineering: A
Volume
821
Pages
141627
Publisher
Elsevier
Description
The high strength metastable β-Ti alloy, Ti–1Al–8V–5Fe (wt%), also referred to as Ti-185, has been successfully processed using the directed energy deposition (DED) based laser engineered net shaping (LENS) process, obviating the beta fleck problem associated with Fe micro-segregation that has been reported in conventionally processed counterparts. The large solidification range for this alloy resulted in finer scale equiaxed β grains in the as deposited condition for a range of process parameters, unlike the large columnar grains observed in case of AM of other titanium alloys such as Ti–6Al–4V. Furthermore, based on the process parameters, a homogeneous distribution of fine scale ω or α precipitates form within the β grains, which has been rationalized based on quantitative thermo-kinetic modelling of a multi-layered deposition process. Atom probe tomography results indicate early stages of β/ω …
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