Engineering Materials

Question 1

What is the definition of toughness?

Answer 1

Toughness is the ability of a material to withstand
an impact without breaking.

Question 2

What is the opposite of toughness?

Answer 2

The opposite of toughness is brittleness. A brittle material will shatter in
response to an impact.

Question 3

What is the definition of ductility?

Answer 3

Ductility is the amount that a material can be deformed.

Question 4

What is the definition of malleability?

Answer 4

Malleability is the ability of a material to be deformed without rupturing.

Question 5

What is the definition of hardness?

Answer 5

Hardness is the ability of a material to resist wear and abrasion.

Question 6

What is the definition of strength?

Answer 6

Strength is the ability of a material to withstand a
force that is applied to it.

Question 7

What is the definition of stiffness?

Answer 7

Stiffness is the ability of a material to resist bending.

Question 8

What are all the ferrous metals and alloys

Answer 8

-cast iron
-low carbon steels
-high carbon steels
-stainless steel

Question 9

What are the alloying elements, properties and typical uses of Cast Iron?

Answer 9

3–3.5% carbon

-Good compressive strength.

-Hard, so can be difficult to machine, but suitable for casting.

-Brittle compared to other ferrous metals.

-Poor corrosion resistance, so rusts easily.

-Relatively low cost.

Uses include: Anvils, engineering vices, engine blocks, machine tool beds

Question 10

What are the alloying elements, properties and typical uses of low carbon steel?

Answer 10

Less than 0.3% carbon

-Lower strength than other steels, but still stronger than most non- ferrous materials.

-Tough and relatively low cost.

-Cannot be hardened.

Uses include:
Nails and screws, car
bodies, steel sheet

Question 11

What are the alloying elements, properties and typical uses of high carbon steel?

Answer 11

0.8–1.4% carbon

-Strong and hard, but not as tough as lower carbon steel.

-Difficult to form.

-Can be hardened.

Uses include:
Tools, such as saw
blades, hammers,
chisels

Question 12

What are the alloying elements, properties and typical uses of stainless steel?

Answer 12

At least 11.5% chromium

-Strong and hard.

-Difficult to machine.

-Good corrosion resistance: does not rust.

-Relatively expensive.

Uses include: Knives and forks, medical equipment, sinks