CH.2 and 3 review

Question 1

Macthplate pattern

Answer 1

these patterns are often cast with the cope (top) and drag (bottom) portions of the pattern mounted on opposite sides of a plate to speed up the molding process.

Question 2

Grey Iron

Answer 2

Graphite Flakes. Brittle. However good lubricity and is easy to machine.

Question 3

White iron

Answer 3

. Formed when graphization does not occur. uses rapid cooling. has cementite and iron carbides in microstructure instead of graphites. Good hardness and wear resistance. used in snowplows, mining and milling equipment.

Question 4

Ductile Iron

Answer 4

Very Ductile.has round shpherical nodules in microstutcure

Question 5

Iron has “blank” carbon in it

Answer 5

out of solution. a substance that has separated from a dissolved form and returned to a solid or undissolved form

Question 6

What was the first metal to be cast by man

Answer 6

Copper

Question 7

two types of foundry

Answer 7

Jobbing and captive

Question 8

Malleable iron

Answer 8

iron which has nodules of graphite in it’s microstucure which looks like a combination of grey and ductile iron. good ductility, but not as much as ductile iron, and good toughness. however not used much in foundry industry

Question 9

Steel numbering system

Answer 9

first two is a type of material including alloying elements, and the last two is carbon percentage.

Question 10

Advantages of Foundry industry

Answer 10

thoeritelically any alloy can be cast compared to other machining processes. simple tooling and low operational cost

Question 11

What are some examples of metal casting in automotive industry

Answer 11

aluminum cylindrical blocks and heads. steel frames and doors. ductile iron pistons and gears.

Question 12

Cast irons are

Answer 12

iron alloys that contain 2 % or more of carbon

Question 13

Graphitization and graphite shape affects

Answer 13

ductility, hardness, cooling rates

Question 14

how much carbon is in steels?

Answer 14

0.05 -2%