[ILM] 101L Materials & Fastening Devices

Question 1

Alloy

Answer 1

a material with metallic properties that is composed of 2 or more chemical elements; at least one of which is a metal

Question 2

work hardening

Answer 2

an increase in hardness and strength of a metal as a result of deformation occurring at low temp

Question 3

oxidization

Answer 3

a chemical reaction -> corrosion

Question 4

annealing

Answer 4

a process of heating and slowly cooling a metal in order to toughen it and reduce brittleness(깨지기 쉬움)

Question 5

quench

Answer 5

metal that is cooled suddenly

Question 6

ferrous metals

Answer 6

those consisting of an iron base

steel
cast iron
wrought iron
stainless steel

Question 7

non-ferrous metals

Answer 7

aluminum
brass
copper
lead
magnesium
nickel
silver
gold

Question 8

higher than 1.7% carbon
less than 1.7% carbon

Answer 8

cast iron(주철) - very porous & brittle
steel(강철)

Question 9

stainless steel

Answer 9

impervious(영향받지않는) to ordinary corrosion and rusting

Question 10

brass ==

Answer 10

an alloy of copper & zinc (황동)

Question 11

50:50

95:5

Answer 11

copper & lead

tin & antimony

Question 12

Teflon

Answer 12

a very stable plastic polymer

Question 13

asbestos

Answer 13

석면

Question 14

crest is

root is

pitch

Answer 14

outer edge of the thread

the inner valley area of the thread

crest to crest distance

Question 15

bolt length is the distance measured from under the bolt head to the tip

T or F

Answer 15

True, never include the bolt head

Question 16

UNEF - Unified National Extra Fine

NPT - National Pipe Thread

Answer 16

UNEF is not common

NPT is common

Question 17

always add 2 to the number of lines to calculate the grade of imperial bolt & nut markings

T or F

Answer 17

True

Question 18

removal of bolts with thread lock may require some heat (especially when old)

T or F

Answer 18

True