ME Metals and Alloys 2

Question 1

Austenitic stainless steels (e.g., 304) are non-magnetic primarily because:

Accepted Answer

The FCC austenite phase is paramagnetic

Answer

Austenitic stainless steels retain the FCC austenite phase at room temperature due to high nickel content, and this phase is paramagnetic (non-magnetic).

Question 2

The tempering of martensite in steel is performed to:

Accepted Answer

Improve toughness by relieving internal stresses and precipitating carbides

Answer

Tempering heats quenched martensite to an intermediate temperature, allowing carbon to precipitate as fine carbides and relieving residual stresses, improving toughness.

Question 3

Which copper alloy is known for its excellent spring-back properties and electrical conductivity?

Accepted Answer

Beryllium copper (Cu-Be)

Answer

Beryllium copper has the highest strength and hardness of any copper alloy, combined with excellent spring properties, making it ideal for electrical connectors and springs.

Question 4

The Jominy end-quench test is used to measure which property of steel?

Accepted Answer

Hardenability

Answer

The Jominy end-quench test measures hardenability by quenching one end of a bar and measuring hardness as a function of distance from the quenched end.

Question 5

Grain refinement in metals typically results in:

Accepted Answer

Increased yield strength and toughness

Answer

According to the Hall-Petch relationship, smaller grain size increases yield strength, and fine-grained metals also generally show improved toughness.

ME - Materials Engineer Practice Test

ME - Materials Engineer Practice Test

ME Metals and Alloys 2