Material Science Final

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11 Terms

1
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Composition of Steel v. Cast Iron. What is the threshold?

2.1%

2
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How to increase strength of Low Carbon Steel v. High Carbon Steel? Why or why not use the same method?

Low carbon is more ductile and can be strengthen through cold working or heat treatment.

High carbon is already strong and brittle so heat treatment/quenching is better.

3
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Best design used in Marine Applications. (Rust resistant)

Cupronickel!! Copper and nickel alloy.

4
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Hardness or Strength of material. How to increase the strength?

Grain size reduction, heat treatment, alloying or cold working.

5
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Dislocations (a defect). Why do they happen?

External stress applied to the material

6
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When do dislocations happen?

Linear defect. Edge and screw. Edge extra half plane inserted to crystal lattice. Screw shearing or slipping of one part of the crystal over another.

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What is Quenching?

Rapid cooling in water to increase hardness and strength, changing microstructure. (Can also restore malleability or modify other properties)

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What is Coldworking?

Shaping/plastic deforming metal at room temperature to increase strength and hardness. More brittle though.

9
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Alloy Steel v. Non-Alloyed Steel. Difference? Which is higher strength? How?

Alloy. is mixture with other metals in order to increase strength/ durability and or corrosion resistance. Utilizing properties of the other metals.

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What point all phases exist at the same time?

Eutectic

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How does Eutectic affect material properties? Good? Bad? Significance? Microstructure?

It has to be a balance because flexibility in properties can be useful in strength and ductility, however that means it’s also flexible in the ways it can corrode or become brittle