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Detection of Internal Pores in Ti6Al4V Powder

Time: 2019-04-10

♦ Detection Method: metallographic analysis

♦ Principle:Detect internal appearance of powder using metallographic microscope. 

♦ Detection Results:

1) metallographic Images

              #1 (sample from VTECH) 

               #2 (sample from VTECH) 

              #3 (sample from V TECH)

(Remark: Black spots on powder are resin adhesive used for fixture.)

Conclusion: No obvious internal pore in particle of powder samples was found.

2) SEM Images

                               #1 (sample from V TECH)

                              #2 (sample from V TECH)

Conclusion: No obvious crack on particle of powder samples was found. Sphericity of particles is high. 

3) Typical internal pores in particle of powder

(Remark: Images of typical internal pores in particle of powder are from bibliography.)


♦ Reason of forming internal pores in particle of powder:

Internal pores in particle of powder are formed in gas atomization process. Inert gas that can’t be dissolved in metal, enter into atomized fused drops. A mass of cold gas cool fused drops rapidly, internal pores are formed in concretionary particles.

The unique technology “Rapid Atomization”that developed by VTECH, atomize metal liquid with very low volume of gas and thermal-flame. Doing that can reduce gas impurities in powder, and also give adequate balling time to avoid from shaping internal pores. 


♦ Features of VTECHs Ti6Al4V Powder

High Purity: Strict control on oxygen, nitrogen, hydrogen content.

Good Flowability: High spheroidization rate, high sphericity, smooth surface.

High Density: No internal porosity, high apparent density and tap density.