ferrous metals - hardening Flashcards
1
Q
what steels suited
A
low carbon and low alloy steels
2
Q
methods
A
caburising
nitriding
3
Q
methods of carburising
A
pack
gas
liquid
4
Q
pack carburising
A
soaked with carbon rich material (coal)
5
Q
gas carburising
A
soaked with gas
6
Q
liquid carburising
A
heated in molten bath of sodium cyanide or barium cyanide
7
Q
nitriding
A
heated with ammonia gas
increased wear resistance
8
Q
what does depth depend on
A
soak time
9
Q
direct hardening methods
A
flame hardening
induction hardening
10
Q
flame hardening
A
oxy-acetylene torch heats up and immediately quenched with water jet
0.4 carbon content requried
11
Q
induction hardening
A
whole piece heated
eddy currents created]
heat reached then quenched by water jet
12
Q
how does the depth of heating in induction hardening change
A
lower current frequenchy = deeper heating
