Material Properties & Characterization Flashcards
7 cards from real CAMT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Material Properties & Characterization flashcards as text
Which non-destructive evaluation (NDE) method is best suited to detect internal voids and delaminations in an AM metal part?
Answer: Industrial computed tomography (CT) scanning
Industrial CT scanning creates volumetric 3D images of the part interior, revealing internal porosity, cracks, and delaminations without destroying the part.
The elongation at break of a material is a measure of its:
Answer: Ductility
Elongation at break, expressed as a percentage of original length, quantifies how much a material deforms plastically before fracturing, which is ductility.
Which phenomenon in metal powder bed fusion causes parts to warp and detach from the build plate?
Answer: Thermal deformation caused by residual stress buildup during solidification
High residual stresses from thermal gradients can exceed the adhesion between the part and build plate, causing deformation or delamination.
Stainless steel 316L is commonly used in metal AM for medical and chemical applications because it offers:
Answer: Excellent corrosion resistance due to molybdenum content
The molybdenum addition in 316L stainless steel significantly enhances corrosion resistance, particularly against chlorides, making it suitable for medical and marine environments.
The purpose of Hot Isostatic Pressing (HIP) post-processing on metal AM parts is primarily to:
Answer: Eliminate internal porosity and improve mechanical properties through heat and pressure
HIP uses simultaneous high temperature and isostatic gas pressure to collapse internal voids, densifying the part and significantly improving fatigue properties.
Which property indicates a material's ability to absorb energy and deform plastically before fracturing, relevant to impact resistance?
Answer: Toughness
Toughness is the total energy a material absorbs before fracture, represented by the area under the stress-strain curve, and determines impact resistance.
In FDM printing, the inter-layer adhesion strength is primarily influenced by:
Answer: Print temperature, cooling rate, and layer height
Higher print temperatures improve polymer chain diffusion across layer boundaries, while slower cooling allows more bonding time; layer height affects contact area.