Influence of powder properties and processing gas on the microstructural evolution of Armstrong CP-titanium and Ti6Al4V powders processed by cold spray
Schuette, Waynie M. Brewer, Luke N. Perez-Andrade, Lorena I. Bhattiprolu, Venkata Satish
Influence of powder properties and processing gas on the microstructural evolution of Armstrong CP-titanium and Ti6Al4V powders processed by cold spray
Schuette, Waynie M. 1Brewer, Luke N. 2Perez-Andrade, Lorena I. 2Bhattiprolu, Venkata Satish3
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作者信息
1. Boeing Co
2. Univ Alabama
3. South Dakota Mines
折叠
Abstract
This paper studies the microstructural evolution of commercially pure titanium (CP-Ti) and Ti6Al4V powders manufactured by the Armstrong process deposited by cold spray with nitrogen and helium. The unique, coral-like morphology of the powders resulted in high density deposits sprayed with both nitrogen and helium carrier gasses. The plastic deformation of the CP-Ti and Ti6Al4V particles upon impact leads to refinement of the equiaxed grains present in the starting powder. CP-Ti deposits sprayed with nitrogen result in a grain size of 1 +/- 0.6 mu m while deposit processed with helium results in a grain size of 0.7 +/- 0.2 mu m with no clear difference between the grain size at particle interiors and at prior particles boundaries. The low levels of intragranular misorientation in the CP-Ti helium deposit indicated the presence of recrystallized grains. The higher grain refinement when using helium as carrier gas resulted in a weak basal plane (0001) fiber texture. Regions of ultrafine grains are also identified in the microstructure of Ti6Al4V analyzed by SEM. Microhardness values of the deposits made with these coral-like morphology powders were similar to CP-Ti and Ti6Al4V cold sprayed deposits produced with spherical powders.
Key words
Cold spray/Plastic deformation/Microstructural evolution/Recrystallization/electron back scattered diffraction/MECHANICAL-PROPERTIES/PARTICLE DEFORMATION/ALLOY/DEPOSITION/COATINGS/TEXTURE
NSTL
Elsevier