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Review Questions

Review Questions

1 .
A powder particle size distribution denoted by D90=100 means what?
  1. All the powder particles are less than 90 microns
  2. 90% of powder particles are less than 100 microns
  3. 90% of powder particles are equal to 100 microns
  4. 100% of powder particles are less than 90 microns
2 .
Atomization is a process where
  1. plasma torch is used to melt a cylindrical bar of the desired alloy
  2. Existing irregularly shaped or porous particles are melted into spherical powder particles
  3. A liquid metal stream is pushed through an orifice and mixed with flowing fluid that forces the liquid to scatter, which then solidifies into generally spherical powders
  4. A wire feedstock is melted by plasma torches
3 .
Which AM processes use metal powders?
  1. PBF, BJP, DED, and cold spray
  2. SL Only
  3. PBF only
  4. DED only