Please enable JavaScript.
Coggle requires JavaScript to display documents.
CHAPTER 8 - Coggle Diagram
CHAPTER 8
STEELS
Low carbon
Med carbon
High carbon
HSLA
high alloy
Cast Iron - brittle, easy to cast, > 2.1%wt C
iron carbon silicon alloys
Gray cast iron
small graphite flakes
low strength
low ductility
contains graphite (gray) and alpha ferrite
Large graphite - good dampening, stable dimensional, resistance to thermal shock, machinable
small graphite - higher tensile strength, high young modulus
if tempered, strength and toughness increase
3% carbon, Si 1.8-2.4%
gears, piston rings, crankshaft
slow cooliing
weak, brittle
high fluidity
White cast iron
-large amount carbides (flakes)
white fracture surface (carbide)
strong, insignificant ductility
no graphite, only cementite
cement mixers, ball mills, drawing dies
fast cooling
hard and brittle
nodular (ductile) cast iron
Mg to gray cast iron cause graphite becomes sphere
better ductility
good toughness, machinable
pump bodies, gears, pistons
used in automotive
malleable cast iron
annealing heat treated (800-900C) white cast iron
graphite in nodular (rosettes)
similar properties with ductile
railroad equipment, connecting rods, pipe fittings