CAMT Material Properties & Characterization 2

Question 1

Which characterization technique uses X-rays to determine the crystal structure and phase composition of a metal AM part?

Accepted Answer

X-ray diffraction (XRD)

Answer

XRD identifies crystal phases by measuring diffraction angles caused by lattice spacing in the material's crystal structure.

Question 2

Residual stress in metal AM parts is primarily caused by:

Accepted Answer

Rapid thermal cycling and non-uniform temperature gradients during solidification

Answer

The rapid heating and cooling cycles create steep thermal gradients that cause differential expansion/contraction, leaving residual stresses locked in the part.

Question 3

The tensile strength of a FDM part is generally highest when the applied load is oriented:

Accepted Answer

Parallel to the build layers (XY-direction)

Answer

FDM inter-layer bonds are the weakest link, so loads applied parallel to the layers avoid stressing those bonds, yielding higher strength.

Question 4

Which material characterization method uses a focused electron beam to image surface morphology at high magnification?

Accepted Answer

Scanning electron microscopy (SEM)

Answer

SEM uses a focused electron beam to produce high-resolution images of surface topography and microstructure.

Question 5

Differential Scanning Calorimetry (DSC) is used in AM material characterization to measure:

Accepted Answer

Thermal transitions such as melting point, crystallization, and Tg

Answer

DSC measures heat flow into or out of a material as a function of temperature, identifying phase transitions like melting, crystallization, and glass transition.

CAMT - Certified Additive Manufacturing Technician Practice Test

CAMT - Certified Additive Manufacturing Technician Practice Test

CAMT Material Properties & Characterization 2