CAMT Material Properties & Characterization 3

Question 1

Which non-destructive evaluation (NDE) method is best suited to detect internal voids and delaminations in an AM metal part?

Accepted Answer

Industrial computed tomography (CT) scanning

Answer

Industrial CT scanning creates volumetric 3D images of the part interior, revealing internal porosity, cracks, and delaminations without destroying the part.

Question 2

The elongation at break of a material is a measure of its:

Accepted Answer

Ductility

Answer

Elongation at break, expressed as a percentage of original length, quantifies how much a material deforms plastically before fracturing, which is ductility.

Question 3

Which phenomenon in metal powder bed fusion causes parts to warp and detach from the build plate?

Accepted Answer

Thermal deformation caused by residual stress buildup during solidification

Answer

High residual stresses from thermal gradients can exceed the adhesion between the part and build plate, causing deformation or delamination.

Question 4

Stainless steel 316L is commonly used in metal AM for medical and chemical applications because it offers:

Accepted Answer

Excellent corrosion resistance due to molybdenum content

Answer

The molybdenum addition in 316L stainless steel significantly enhances corrosion resistance, particularly against chlorides, making it suitable for medical and marine environments.

Question 5

The purpose of Hot Isostatic Pressing (HIP) post-processing on metal AM parts is primarily to:

Accepted Answer

Eliminate internal porosity and improve mechanical properties through heat and pressure

Answer

HIP uses simultaneous high temperature and isostatic gas pressure to collapse internal voids, densifying the part and significantly improving fatigue properties.

CAMT - Certified Additive Manufacturing Technician Practice Test

CAMT - Certified Additive Manufacturing Technician Practice Test

CAMT Material Properties & Characterization 3