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Materials > Phase Diagrams > Flashcards

Phase Diagrams Flashcards

1
Q

What is Gibb’s phase rule?

A

P+B=C+n

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2
Q

What is the lever rule?

A

WL x R= Wa x Q

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3
Q

What is a eutectoid?

A

An invariant point with 3 solids in equilibrium (Bunny ears)

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4
Q

What is an eutectic?

A

Invariant point with 3 phase in equilibrium

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5
Q

What is peritectoid?

A

Invariant point with 3 solids in equilibrium ( moustache)

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6
Q

What is Pearlite?

A

Ferrite + cementite

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7
Q

How do you identify between ferrite and Austenite?

A

Magnet

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8
Q

What is Hypo?

A

Left hand side of invariant point

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9
Q

What is hyper?

A

Right hand side of invariant point

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10
Q

What iron carbide (Fe3C) alloy is less than 2.1wt% carbon

A

Steel

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11
Q

What is between 2.1 and 6.7wt% carbon?

A

Cast iron.

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12
Q

How is pearlite formed ?

A

Slow cooling from austenite region

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13
Q

How is bainite formed?

A

Moderate cooling from austenite region

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14
Q

How is martensite formed?

A

Quench from austenite region

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15
Q

How is spherodite formed?

A

Reheat pearlite or bainite to 700 degrees for 24h then quench

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16
Q

How do you form tempered martensite?

A

Have to have 100% martensite, the reheat to 500 degrees for a few hours

17
Q

Describe the difference between tempered and normal martensite?

A

Martensite: carbon doesn’t have time to diffuse out so very hard but brittle
Tempered martensite: carbon had time to diffuse out when reheated, cementite will form inside a ferrite matrix and austenite will turn into pearlite

18
Q

How are upper and lower bainite formed?

A

Upper between 300-500
Lower between 200-300
Cementite rods in ferrite matrix ( thinner rods for lower)

19
Q

How are coarse and fine pearlite formed?

A

Coarse: cool down slightly faster
Fine: Cool down in air
Coarse has thicker plates of cementite and ferrite therefore less hard

20
Q

Effect of tempering and adding carbon

A

More carbon = harder but less ductile

Tempering: tempering for longer and higher temp decreases hardness but increases ductility

21
Q

Describe how an IT diagram works

A

First line is beginning of transformation, second line is 100% transformed

22
Q

Why can’t bainite be formed on a CC sometimes?

A

Has to be cooled slowly, by the time it should turn into bainite it has already turned into pearlite q

23
Q

What is the first curve in a CC?

A

Minimum cooling rate to form 100% martensite

Materials (6 decks)

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