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Cat A Module 6 > 6.1 - Ferrous Metals > Flashcards

6.1 - Ferrous Metals Flashcards

1
Q

When talking about ferrous materials what is the base material.

A

Iron

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2
Q

How is iron extracted from iron ore.

A

By mixing it with coke and limestone.

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3
Q

Why does cast iron have limited use in the aviation industry.

A

Low strength to weight ratio and Brittleness.

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4
Q

Carbon contents of steel.

A 
Low = 0.1 - 0.3 %
Medium = 0.3 - 0.5 %
High = 0.5 - 1.05 %
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5
Q

What % does hardness and tensile strength stop increasing at.

A

85%

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6
Q

Carbon allows what in steel to occur.

A

Heat treatment.

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7
Q

Sulphur in steel does what.

A

Decreases ductility and weld ability with increasing content. But increases machine ability

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8
Q

Manganese in steel does what.

A

Contributes to strength and hardness but not as much as carbon.

Decreases ductility and weld ability.

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9
Q

Increasing manganese content in steel decreases what.

A

Ductility and weld ability

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10
Q

Silicon does what to steel.

A

Increases rolled strength and hardness

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11
Q

Phosphorus in steel does what.

A

Increases strength, hardness and corrosion resistance but decreases ductility.

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12
Q

Nickel does what to steel.

A

Increases the harden ability and impact strength.

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13
Q

Chromium does what to steel

A

Increase corrosion resistance, oxidation resistance, Hardenability and improve high-temperature strength. Frequently used in conjunction with toughening elements like nickel.

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14
Q

Molybdenum does what to steel.

A

Increases harden ability

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15
Q

Titanium in steel does what

A

Increases toughness

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16
Q

SAE stands for

A

Society of automotive engineers

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17
Q

ASI stands for

A

American institute of steel and iron

18
Q

Annealing does what to steel.

A

Softens and relieves internal stresses.

19
Q

What is the process of annealing for steel.

A

Heating the steel to 50 degrees F above is upper crit limit and soaking it at that temperature. Then it’s called slowly in a furnace or bath of hot sand.

This will make the steel very soft and ductile.

20
Q

What ferrous material can be hardened by heat treatment.

A

Cast iron

21
Q

The maximum hardness of steel depends entirely on what added compound.

A

Carbon.

22
Q

Carbon steel can be softened by.

A

Annealing.

23
Q

Steel is too hard and brittle so what process decreases this so steel can be used.

A

Tempering

24
Q

Tempering does what to steel.

A

Decreases hardness and increases ductility and toughness.

25
Q

What is normalising.

A

The process of heating steel to relieve stresses caused during forging, welding and machineing.

26
Q

What’s the normalising process.

A

Heat the steel to 100 degrees F above upper crit limit then soak at that temp for a prescribed time then allow to cool at room temp.

27
Q

What determines the rate of quenching.

A

The medium in which the metal is being quenched.

28
Q

Ferrite is.

A

The name given to pure iron that allow for .02% carbon to be absorbed into it.

29
Q

How much carbon can ferrite iron absorb.

A

0.02%

30
Q

Austenite can absorb how much carbon.

A

Up to 2%

31
Q

Cementite iron has what characteristics

A

Hard and brittle

32
Q

Cementite is iron with what carbon content

A

Greater than 2%

33
Q

CRES stands for.

A

Corrosion resistant steel

34
Q

CRES has what characteristics.(4)

A

Corrosion resistant, strength, toughness and resistance to high temperatures.

35
Q

For the CRES classification chart what steel type is represented by (200 and 300), (400)

A

200 and 300 is austenitic

400 is ferritic and martensitic

36
Q

Most widely used CRES is.

A

In the 300 series and called 18-8

37
Q

Austenitic steels are what alloys

A

Chromium-nickel and chromium-Nickel-manganese alloys.

38
Q

Austenitic can be hardened by

A

Cold working, heat treatment only anneals them.

39
Q

Austenitic steel is what in an annealed state and what can it be after being cold worked.

A

After annealing the steel is non magnetic but after being cold worked can be slightly magnetic.

40
Q

Titanium helps to stop what in steel.

A

Intergranular corrosion

41
Q

Steel classification is in what format.

A

First 2 digits refer to the primary alloying element and the last 2 the the percentage of carbon contained in the alloy.

Cat A Module 6 (12 decks)

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