Ch 11 - Applications and Processing of Metal Alloys Flashcards
1
Q
How much carbon is in a cast iron?
A
> 2.1 wt%
2
Q
What are characteristics of a cast iron?
A
- low melting, relatively east to cast
- generally brittle
- cementite decomposes to ferrite + graphite
3
Q
What are some limitations of ferrous alloys?
A
- relatively high densities
- relatively low electrical conductivities
- generally poor corrosion resistance
4
Q
What are the types of annealing?
A
stress relief, process anneal, spheroidize, full anneal, normalize
5
Q
What is stress relief?
A
reduce stresses resulting from:
- plastic deformation
- nonuniform cooling
- phase transformations
6
Q
What is process annealing?
A
negate effects of cold working by recovery/recrystallization
7
Q
What is spheroidizing?
A
- makes soft steels good for machining
- heat just below eutectoid temp and hold for 15-25 hrs
8
Q
What is full annealing?
A
- heat to get gamma iron, then furnace cool to get coarse pearlite
- makes soft steels good for forming
9
Q
What is normalizing?
A
- deform steel with large grains
- heat treat to allow recrystallization and formation of smaller grains
