CMS Industrial Materials & Metallurgy 2

Question 1

Which heat treatment process involves heating steel above its critical temperature and then cooling it slowly in the furnace to reduce hardness and improve machinability?

Accepted Answer

Annealing

Answer

Annealing involves heating steel above its critical temperature and then furnace-cooling it slowly, which softens the metal and improves machinability.

Question 2

What is the primary purpose of adding chromium to stainless steel?

Accepted Answer

Provide corrosion resistance through passive oxide layer

Answer

Chromium (minimum 10.5%) reacts with oxygen to form a thin, stable Cr₂O₃ passive layer on the steel surface that prevents corrosion.

Question 3

A manufacturer needs a material with high strength-to-weight ratio for aerospace components. Which material family is most appropriate?

Accepted Answer

Titanium alloys

Answer

Titanium alloys offer exceptional strength-to-weight ratios and corrosion resistance, making them the preferred choice for aerospace structural components.

Question 4

What does the Rockwell hardness test measure differently from the Brinell hardness test?

Accepted Answer

It measures the depth of penetration under a fixed load

Answer

Rockwell hardness measures the depth of indentation under a prescribed load, while Brinell measures the diameter of the indentation left by a hardened ball.

Question 5

Which phase diagram feature indicates the temperature at which a single-phase liquid transforms directly into two solid phases simultaneously?

Accepted Answer

Eutectic point

Answer

The eutectic point is the specific temperature and composition at which a liquid transforms simultaneously into two distinct solid phases.

(CMS) Certified Manufacturing Specialist Practice Test

(CMS) Certified Manufacturing Specialist Practice Test

CMS Industrial Materials & Metallurgy 2