ferrous metals -heat treatment

Question 1

what is important factors for heat treatment

Answer 1

carbon content
temp
time to cool

Question 2

what is heat treatment

Answer 2

heating and cooling to change properties without changing shape/size

Question 3

states of steel

Answer 3

ferrite
austenite
cementite
pearlite

Question 4

composition of pearlite

Answer 4

alpha ferrite and cementite

Question 5

quenching

Answer 5

carbon trapped and distorts lattice grain boundaries
boundaries give hardness

Question 6

types of metal grain structure

Answer 6

face centre cubic (FCC)
body centre cubic (BCC)
body centred tetragonal (BCT)

Question 7

what structure is austenite

Answer 7

FCC

Question 8

what structure is ferrite

Answer 8

bcc

Question 9

what structure is martsenite

Answer 9

Bct

Question 10

annealing

Answer 10

softens metal
relieves internal stress
cooled slowly

Question 11

normalising

Answer 11

heated above critical temp and soaked
cooled at room temp
relieves internal stresses

Question 12

tempering

Answer 12

decreases hardness
increases ductility and toughness
helps relieve internal stresses