Unit 4 Flashcards
What are the three groups of solid materials, why are there placed in one of these three groups?
1) Metals
2) Ceramics
3) Polymers
base of their chemical makeup and atomic structures
what are metals?
A combination of metallic elements. They have large numbers of free roaming electrons. Many properties of metals are attributed these electrons, which many of its properties are linked to.
What are ceramics? give a few examples
Ceramics are compounds between metallic and non-metallic elements. Ceramics are materials such as pottery, porcelain, clay products, refractories, abrasives, cement and glass.
what are polymers?
Polymers consist of plastics and rubber materials. Many are organic compounds that are chemically based on carbon, hydrogen and other non-metallic elements.
what are the three states of matter
gas, liquid, solid
what is an alloy
An alloy is made up of two or more elements, where one must be a metal.
What is austenite?
Austenite is known as gamma iron. This phase only exists ABOVE 723˚C.
What is ferrite?
Ferrite is known as alpha iron. Ferrite is very soft, ductile and has a low tensile strength.
what is cementite?
Cementite is a compound of iron carbide (Fe3C) and contains 6.67% Carbon. It is very hard and brittle, has a low tensile strength, and high compressive strength.
what is pearlite?
Low carbon steel
Low carbon steel (0.07% to 0.14% Carbon)
- Automobile body parts, wire products – rolling sheets, rivets, nails, chains, car bodies
Mild carbon steel
(0.15% to 0.30% Carbon)
- Structural steels
Medium carbon steel
(0.30% -0.60% Carbon)
- High-strength materials, wires, cutting tools, files, drills, punches, dies and industrial knives.
high carbon steel
(0.60% - 1.25% Carbon)
- high-strength spring materials and wires, cutting tools, punches, dies and industrial knives
