Metalurgy Flashcards

0
Q

Very high carbon steel used to make punches, dies, sheer blades and cutting tools are often refers to as??

A

Tool steel or high speed steel

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1
Q

List two types of ferrous metals?

A

Carbon steel and cast iron

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2
Q

Non-ferrous metals are?

A
Aluminum
Magnesium
Zinc
Copper
Lead
And brass
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3
Q

What non-ferrous metal is magnetic?

A

Nickel

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4
Q

Nickel is what color?

A

A white grey

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5
Q

Steel and cast iron are usually what color

A

Silver grey to grey

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6
Q

Hot rolled steel has what type of surface?

A

Black mill scale, cold rolled is shiny and smooth

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7
Q

What mechanical properties does copper have?

A

It can be easily beaten ad be formed into a new shape.

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8
Q

What material is used in bearings?

A

Brass

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9
Q

Hardness is..??

A

The ability of metal to resist penetration and plastic deformation.

Examples are:
Carbide, ceramic and hardened steel.

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10
Q

Ductility is..?

A

Is the ability of a metal to be deformed without breaking.

Ductile metals are:
Steel, copper aluminum and lead machine steel.

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11
Q

Toughness is..?

A

The ability of metal to withstand shock and impact.

Example:
Steel chisels are tougher than a steel tap.

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12
Q

Tensile strength is..?

A

Is the a lilting a metal to withstand pulling without breaking.

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13
Q

Machine-ability measures.. ??

A

The was with which you can cut and shape a metal

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14
Q

What steel is the most common used for building steel as most other structures..??

A

Carbon steel.

High strength, low alloy steels are also available.

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15
Q

Galvanized iron, stainless steel, aluminium, copper and brass are other materials available in sheet metal.

Y
N

16
Q

Carbon and alloy steels (numbering system) use a four or five digit code

Ex.
Chromium-molybdenum 4140

What is the 41 ad the 40

A

41 is the material

40 is the percent of carbon content in the material.

17
Q

Carbon steel mechanical properties

Low carbon 0.02-0.30% carbon

Medium carbon steel 0.30-0.60%

High carbon steel over 0.60%

A

Low carbon - can not be hardened

Medium carbon - has better mechanical properties than low carbon steel.

And has a high tensile strength (the ability of a metal to with stand pulling without breaking.

High carbon. Steel - meant to be hardened

Used for cutting tools

18
Q

High strength low alloy steel is low carbon or high carbon steel?

A

Low carbon - and is ideal for structures exposed to the environment.

19
Q

What material is a mixture of copper and zinc?

20
Q

What material consists of copper and tin?

21
Q

What material is harder

Bronze or brass?

A

Bronze is usually harder than brass

22
Q

What I are advantage and disadvantage of beryllium-bronze??

A

It is used because of it’s strength and hardened

But

It is a health hazard due to it’s toxicity

23
Q

The structure of Soft steel is called

A

Pearlite

Pearlite steels consist of ferrite and cementite

24
The structure of hardened steel is called
Martensite - it consists of angular needle like Chrystal's
25
The precise amount of ferrite and cementite in a steel depends on the percentage of.....
Carbon in the steel
26
How is austenite formed?
Austenite is formed when Pearlite steel is heated to a red hot.
27
The structure of hardened steel is called?
Martensite.
28
What is the heat treating process?
Hardening Tempering Annealing Normalizing
29
What two processes are required for hardening a steel?
Steel is heated until it changes to austenite Than quenched rapidly (steel must contain at least 0.20% carbon.
30
What is the most effective quenching medium?
Brine(salt water) followed by Water Oil Air
31
What must be done to a steel immediately after hardening?
The steel must be tempered to relieve it's brittle stresses and strains. If not it will crack.
32
Full annealing does what to steel ?
Converts martensite steel to Pearlite taking out all the stresses making a hardened work piece soft again.
33
Process annealing is used to restore what in the steels struxture.
Ductility - ability to be deformed without breaking.
34
What material can withstand more stress Steel or brass
Steel
35
What material has the highest rte change of thermal growth
Aluminum
36
Forging is what?
Forging I a process involving the shaping of metal.