Aircraft Materials - Ferrous

Question 1

What temperature would steel be tempered at?

Answer 1

Below the annealing temperature

Question 2

Tempering steel gives

Answer 2

Relief of internal stress after hardening

Question 3

The addition of chromium to steel will produce

Answer 3

Hardness

Question 4

Chromium added to plain carbon steel

Answer 4

Increases it’s resistance to corrosion

Question 5

The purpose of cars hardening is to

Answer 5

Produce a hard case over a tough core

Question 6

Nitriding is

Answer 6

Case hardening

Question 7

Medium carbon steels have a carbon content of

Answer 7

0.3 - 0.5%

Question 8

A ferrous metal contains

Answer 8

Iron

Question 9

With respect to ferrous metals

Answer 9

Iron is the main element and most ferrous metal are magnetic

Question 10

The annealing process on steel is required sometimes as it

Answer 10

Relieves internal stress suffered after engineering processes

Question 11

Tempering entails

Answer 11

Heating under the UPC and slow cooling

Question 12

Austenitic stainless steels are

Answer 12

Non-magnetic

Question 13

How is residual magnetism removed after an NDT examination?

Answer 13

Degaussing

Question 14

The difference between annealing and normalising is

Answer 14

Both are heated above UCT, cool slowly to anneal, cool in air to normalise

Question 15

Normalising of steel is done to

Answer 15

Remove residual stress of the manufacturing process

Question 16

When normalising, the material is

Answer 16

Left to cool in room temperature

Question 17

Cast iron is

Answer 17

Heavy and brittle

Question 18

Case hardening can be carried out on

Answer 18

Any ferrous metal

Question 19

Exhaust systems are usually made from stainless steel which is susceptible to

Answer 19

Intergranular corrosion

Question 20

When metal is first heated slightly above its critical temperature and then cooled rapidly it is common that the metal will increase in

Answer 20

Brittleness and hardness

Question 21

Steel is tempered

Answer 21

After hardening

Question 22

If a steel component is operated below the fatigue limit, the fatigue life is

Answer 22

Infinite

Question 23

A low carbon steel would normally be case hardened using

Answer 23

Pack or gas carburising

Question 24

After a product has been manufactured and all heat treatment has been carried out the stress remaining if any is termed as

Answer 24

Residual stress

Question 25

Annealing steels

Answer 25

Makes the metal malleable

Question 26

Tempering of hardened steel is carried out to

Answer 26

Significantly reduce the brittleness without suffering a major drop in its strength

Question 27

High speed steel relies heavily on the following metallic element for its ability to cut other metals, even when it is heated to a dull red colour

Answer 27

Tungsten

Question 28

When a low carbon steel bolt is stretched beyond its elastic limit without

Answer 28

Deform permanently

Question 29

Fatigue failure may be defined as

Answer 29

Reduction in strength due to alternating loads

Question 30

Austenitic steel is produced when the material is heated to

Answer 30

Above the Upper Critical Point

Question 31

Steel is produced by refining pig iron where air/oxygen is blown through the molten material to remove

Answer 31

Carbon

Question 32

During a Rockwell Hardness test, what dimension is being measured?

Answer 32

The depth of the indent

Question 33

What does the 0 in 2024-T3 mean?

Answer 33

The alloy has not been modified

Question 34

How is material galvanised?

Answer 34

Dipped in a bath of molten zinc