Mechanical and Microstructural Characterization of Cold-Sprayed Ti-6Al-4V After Heat Treatment

Effects of Spray Parameters and Post-spray Heat Treatment on Microstructure and Mechanical Properties of Warm-Sprayed Ti-6Al-4V Coatings

“…There have been several reports about the tensile properties of Ti-6Al-4V deposits obtained by CS (Ref 3,12,13) and LPPS (Ref 14). In general, the ultimate tensile strength and elongation to failure were lower compared to the bulk material primarily due to the existence of discontinuity in the microstructure of the coatings, which resulted in weak bonding between deposited Ti-6Al-4V particles.…”

Microstructure and mechanical property of Ti and Ti6Al4V prepared by an in-situ shot peening assisted cold spraying

“…Since titanium and its alloys are active and easy to get oxidized, the low processing temperature feature makes cold spraying an effective process to prepare coatings with negligible oxidation from Ti and its alloys [2][3][4][5][6][7][8][9][10][11][12][13][14]. On the other hand, residual compressive stress [15], usually developed in cold sprayed coatings, allows cold spray to deposit materials without thickness limitation under optimized spraying conditions.…”

Microstructural analysis of Ti–6Al–4V powder for cold gas dynamic spray applications

“…Because of this transformation, Ti-6Al-4V properties are dependent on thermomechanical treatments and microstructure [19]. The nature of the a/b alloy is such that heat treatment and working of the material can dramatically change the microstructure between such varied morphologies as HCP needle-like martensite and equiaxed a + b [9,10,[20][21][22][23]. The final microstructure of a deposit is then heavily dependent on not only the processing parameters, but also the original microstructure of the feedstock powder.…”

“…Electron backscatter diffraction (EBSD) and secondary electron imaging (SEI) of large (100 lm) Ti-6Al-4V particles performed by Zhang et al verifies that these particles are mostly martensitic [9]. Others debate whether the structure is truly martensitic, Widmanstatten, or even coarse lamellar alpha [10][11][12]. Few sources comment on the external structure of the powders, generally claiming them to be very large prior beta grains along the exterior of the particle, but offer no causal explanation of this formation [9,13].…”