6.1

Question 1

Magnetite iron has what % of iron

Answer 1

72%

Question 2

Hematite iron has what % or iron

Answer 2

70%

Question 3

Properties of ferrite steel

Answer 3

• 0.006% Carbon
• Soft and ductile
• similar to pure iron

Question 4

Property’s of Cementite

Answer 4

• 6.67% Carbon
• Hard & brittle

Question 5

Pearlite steel Properties

Answer 5

Combines ferrite & cemetite

Question 6

Properties of Cast Iron

Answer 6

• Hard and brittle
• Iron is cooled rapidly by quenching

Question 7

Low Carbon steel content

Answer 7

Up to 0.3% Carbon

Question 8

Medium Carbon Steel content

Answer 8

0.3% -> 0.8%

Question 9

High Carbon Steel Content

Answer 9

0.8->1.7%

Question 10

Plain Carbon Content

Answer 10

0.0 -> 1.7%

Question 11

Nicole + iron properties

Answer 11

Increase Strength & toughness
Improves corrosion resistance

Question 12

Chromium + Iron Properties

Answer 12

Improved hardness & strength
More grain growth
Improved corrosion resistance

Question 13

Stainless Steel alloy percentages
( chrome / nickel )

Answer 13

18% chrome 8% nickel

Question 14

A286 Alloy (Super Alloy) consists of:

Answer 14

57% iron
25% Nickel
14.5% Chromium
2% Titanium
0.3% Vanadium
0.04% Carbon

Question 15

Properties of A286 Alloy ( Super Alloy )

Answer 15

• High strength
• High corrosion Resistance
• Good Heat resistance @ high temp

Question 16

What steel is commonly used in aircraft

Answer 16

SAE 2330

Question 17

In Steel Marking what do each of the four digits stand for

• Eg SAE 2330

Answer 17

1st Digit = Alloy element
2nd Digit = % of alloy
3rd & 4th = % in hundreds of Carbon

Question 18

Low Carbon steel Properties

Answer 18

Strong
Rusts easily

Question 19

Medium Carbon Steel properties

Answer 19

Harder then low Carbon steel

Question 20

High Carbon steel properties

Answer 20

Brittle
Harder than medium

Question 21

HHS properties

Answer 21

Very hard
Longer lasting than high Carbon steel
Keeps hardness up to 700 degrees

Question 22

What is Eutectiod

Answer 22

The temperature point (723*C ) when all pearlite and ferrite become ausenite

Question 23

What is cold working

Answer 23

Hammering, bending, rolling, Etc

Question 24

What is annealing

Answer 24

Slowly and uniformly heating and cooling below the critical limit to relief stress

Question 25

What is normalising

Answer 25

Restoring the crystalline structure to normal condition. Relives stress and strains

Question 26

Tensile strength Formula

Answer 26

Max Force used
——————————
Orig. Area of cross section

Question 27

What is fatigue

Answer 27

Cyclic stress to the point of failure which is at a lower stress limit than the ultimate failure limit

Question 28

What is tempering

Answer 28

Reduces brittleness by heating to 200*C and water quenching