Chapter 11 - Heat Treatment & Quenching

Question 1

What is the purpose of quenching a metal?

Answer 1

to control cooling to harden the metals

Question 2

In addition to water, name four other quenching medium.

Answer 2

Brine, Oil, Air and Sand.

Question 3

Of the four stages of quenching, which one is violent?

Answer 3

vapor discharge

Question 4

During which of the four stages of quenching for bubbles start to form a blanket around the sample?

Answer 4

Vapor formation stage

Question 5

Which is brine and why is it effective in quenching?

Answer 5

Brine is salt water, it cools metal quicker than plain water.

Question 6

Name the most commonly used quenching medium.

Answer 6

Water

Question 7

Which type of quenching is the most drastic?

Answer 7

brine quenching

Question 8

Which type of quenching is the most gentle?

Answer 8

air quenching

Question 9

Why will heated oil result in a more rapid quench than oil at room temperature?

Answer 9

It is because oil when heated causes oil more viscous due to this fact, it helps to cover the metal quicker.

Question 10

Which will provide the faster quench, water at 75F or water at 120F?

Answer 10

Water at 75F will quench faster than at 120F

Question 11

What is the minimum amount of time that a sample should be left in an oven before quenching if the sample measures 3” X 4” X 6”?

Answer 11

3 hours