Phase Diagrams - Part 1

Question 1

What does the XYWZ stand for in the AISI-SAE steel designation system?

Answer 1

X: Indicates the group of carbon steel
Y: Amount of alloy
WZ: Carbon concentration to 0.01%

Question 2

What are the three main types of steel and their %C?

Answer 2

1. Eutectoid %C = 0.76
2. Hypoeutectoid %C < 0.76
3. Hypereutectoid %C > 0.76

Question 3

What is pearlite made up of?

Answer 3

Alternate layers of ferrite and cementite (Fe3C)

Question 4

Fraction ferrite equation

Answer 4

X / X + Y

Question 5

Fraction pearlite equation

Answer 5

Y / X + Y

Question 6

What are the three types of steel made up of?

Answer 6

Hypoeutectoid - Ferrite + Pearlite
Eutectoid - 100% Pearlite
Hypereutectoid - Pearlite + Cementite

Question 7

What are the three types of heat treatment

Answer 7

1. Quenching
2. Tempering
3. Annealing