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Materials > Second Year Class Tests > Flashcards

Second Year Class Tests Flashcards

1
Q

The bonding energy is:

A

The energy required to break a bond between atoms

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2
Q

The strength of metals may be increased by:

A

Decreasing the grain size Conducting a cold work process

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3
Q

The engineering stress is also called

A

The nominal stress

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4
Q

The constant of proportionality in the elastic region of a stress-strain diagram is

A

The Young’s modulus/ elastic modulus

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5
Q

Strongly bonded materials have

A

High elastic modulus, high melting temperature and low Coefficient of thermal expansion

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6
Q

What are elastic moduli

A

Bulk modulus Shear modulus Young’s modulus

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7
Q

Crystalline materials…

A

Tend to be densely packed, and have a long range order

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8
Q

Permanent deformation of a material begins to occur when the tensile (or compressive) uniaxial stress

A

Exceeds the yield strength

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9
Q

The AISI-SAE steel designation system uses four digits XYWZ:

A

X= Group Y=Alloy WZ=Concentration of Carbon

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10
Q

The stress concentration factor (Kt) depends on

A

Geometrical proportions (D/d and r/d)

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11
Q

Matensitic steels (weld?)

A

Martensitic steels can be welded, you need to be careful with the cooling rate (not recommended)

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12
Q

When an eutectoid carbon steel is cooled down from the austenized region and under equilibrium conditions the resultant microstructure is

A

100% pearlite

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13
Q

The hardenability of a metal can be determined with the use of

A

A Jominy test

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14
Q

The spherodizing heat treatment..

A

Is conducted to enhance the ductility of pearlite and bainite

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15
Q

To recover some ductility of a steel with 100% martensite in it structure we should conduct

A

A tempering process

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16
Q

In a normalizing heat treatment…

A

The sample is cooled outside the furnace by air (normally room temp)

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17
Q

A Jominy distance represents

A

A cooling rate

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18
Q

Dislocations…

A

make industrial forming treatment possible,are mobile under externally applied stress, and allow plastic deformation to occur

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19
Q

Which phases you will expect in a hypo-eutectoid carbon steel that was heated to austenite region and cooled to room temperature under equilibrium conditions?

A

Ferrite + pearlite

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20
Q

The tendency of a steel to form martensite can be measure through

A

a harden-ability test.

21
Q

The three stages of the annealing process are:

A

Recovery, Recrystallization, Grain growth

22
Q

Isothermal transformation diagrams are also called..

A

TTT (Time-Temperature-Transformation) diagrams.

23
Q

What are the classifications of a metal regarding the percentage of carbon? (steels/irons)

A

A wrought iron has less than 0.008 wt% C, A steel has a wt% C between 0.008% and 2.14%, A cast iron has wt% C between 2.14% and 6.70%

24
Q

The maximum solubility of carbon in austenite at 1148 C is:

A

2.11%

25
Q

Which steels has more tendency to form martensite?

A

Medium carbon steels (wt.%C between 0.25% and 0.6%), High carbon steels (wt.%C between 0.6% and 1.4%)

26
Q

The recrystallization temperature is..

A

The temperature at which recrystallization just reaches completion in 1 hour.

27
Q

The following microstructure corresponds to :

A

A eutectoid carbon steel in an annealed condition

28
Q

The Miller indices for the plane shown in this unit cell are;

A

(2 1 1)

29
Q

The Miller indices for direction shown in this cubic cell are

A

[1 0 2]

30
Q

Is powder metallurgy techniques are used to make polymers components by combining temperature and pressure?

A

NO!

31
Q

Does creep strain increases when temperature or stress increases

A

Yes!

32
Q

What is heated to 700 oC for about 30 hours to recover some ductility?

A

White Iron

33
Q

To ensure that a material is not susceptible to brittle fracture under specific conditions, we would preform a…?

A

Charpy test or Izod test

34
Q

What do high temperatures have an effect on?

A

Vacancies concentration
Mobility of atoms
Creep rate

35
Q

Does the microstructure of the parent material changes depending on the welding process used?

A

nope!

36
Q

Does the addition of Mg or Ce to a white iron produce changes in the graphite’s shape?

A

No

37
Q

Which aluminium series can be age harded?

A

2XXX, 6XXX and 7XXX

38
Q

What does this picture represent in terms of a failure?

A

Some necking.

Not fully ductile or brittle

39
Q

What are characteristics of fatigue failure surface?

A

Striations, Beach marks, Final fracture zone

40
Q

What can the ability of a material to absorb vibration be measured through?

A

A damping test

41
Q

What is is the chief ore of aluminium?

A
42
Q

What are characteristics of transient creep?

A

Creep rate decreases with time,

Deformation is fast at early stages,

Deformation rate becomes slower as it approaches a fixed value

43
Q

What does the type of fracture depend on?

A

The environment the component is working in.

This is why DBTT are important to know when selecting a material.

44
Q

Why is the flow ability property of the green sand used in sand casting process imortant?

A

To allow the sand to shape easily around intrinsic shapes of the model

45
Q

How does the transition temperature and impact energy change as the %C in a steel increases?

A

Transition temperature increases

The impact energy decreases

46
Q

What are mechanical failures?

A

Some are:

Fracture,

Fatigue,

Corrosion,

Creep

47
Q

What is the formation of graphite in the cast iron promoted by?

A

The addition of silicon,

slow cooling temperature

48
Q

The description of a stress-strain curve of brittle material is:

A

A curve where only the elastic region (small toughness) is observed and probably small plastic region

Materials (2 decks)

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