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Materials > Lecture 03/29 > Flashcards

Lecture 03/29 Flashcards

1
Q

Most heat treatments for steels involve?

A

Continuous cooling

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2
Q

For continuous cooling, the time required for a reaction is?

A

Delayed

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3
Q

What is the critical quenching rate?

A

Minimum rate of quenching that produces a totally martensitic structure

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4
Q

Fine pearlite is _ and _ than coarse pearlite?

A

Harder and stronger

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5
Q

Coarse pearlite is more _ than fine pearlite?

A

Ductile

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6
Q

Spheroidite is the _ and _ of all steel alloys?

A

Weakest and softest

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7
Q

The ductility and toughness of martensite may be enhanced by?

A

Tempering

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8
Q

Quenched martensite is?

A

Very hard/brittle

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9
Q

What is the difference between tempered and quenched martensite?

A

Tempered has substantially enhanced ductility and toughness

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10
Q

What is temper embrittlement?

A

Reduction of toughness as measure by impact tests when steel is tempered in certain conditions

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11
Q

What are shape memory alloys?

A

After being deformed, a material returns to its previous size and shape after being heated

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12
Q

What is thermoelastic deformation?

A

Non-permanent when the deformed material is heat treated

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13
Q

CCT diagrams are modified by?

A

Shifting transformation beginning/ending curves to longer times and lower temperatures

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14
Q

Bainite is _ and _ than pearlitic steels?

A

Stronger and harder

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15
Q

Martensite is the most?

A

Hard, strong, and brittle

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16
Q

Why are martensitic properties the way they are?

A

Effectiveness of the interstitial carbon atoms in hindering dislocation and the relatively few slip systems

17
Q

What is intergranular crack propogation?

A

Fracture path is along the boundaries of the austenite phase

18
Q

What does polymorphic mean?

A

Two crystal structures, and the shape memory effect involves phase transformations between them

Materials (12 decks)

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