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Matse 259 Final Exam Review With 100% Correct Answers

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Matse 259 Final Exam Review With 100% Correct Answers Coarse Pearlite high diffusion allows Carbon atoms to diffuse over long distances and form thick lamellae Fine Pearlite low diffusion allows Carbon atoms to diffuse over short distances and form thin lamellae Martensite NOT diffusi...

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  • June 7, 2024
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Matse 259 Final Exam Review With 100%
Correct Answers
Coarse Pearlite
high diffusion allows Carbon atoms to diffuse over long distances and form thick lamellae


Fine Pearlite
low diffusion allows Carbon atoms to diffuse over short distances and form thin lamellae


Martensite
NOT diffusion driven
independent of time


Process Annealing
used to negate effects of coldwork and to soften and increase ductility
recovery and recrystalization can occur


Stress Relief
component is heated to low temperature, held there then cooled to room temperature by air


Normalizing
redefines grains to produce uniform size distribution
cools to 900-950C


Full Annealing
used to produce coarse pearlite


Spheroidizing
takes 24-48 hrs


Severity of Quench
indicates rate of cooling
water=most severe


10XX Steel
Mn added


41XX, 43XX steel
Most common steel


92XX steel
used in forging to promote pearlite


Free machining
unweldable

, Low Carbon steel
<.25 wt% C
strengthened by coldwork
ferrite and pearlite


Medium Carbon steel
.25-.6 wt% C


High Carbon steel
.6-1.4 wt% C


Gray Cast Steel
damps vibrational energy
high resistance to wear


White cast steel
hard and brittle
intermediary in production of malleable cast iron
virtually unmachinable


Sigma
in stainless steels decreases corrosion resistance


Stainless Steel Microstructure Constituents
ferrite
austenite
martinsite
duplex
precipitation hardening


Ferritic Stainless Steel
11-29 wt% Cr
no nickel
little carbon


Austenitic Stainless Steel
more corrosion resistant than ferritic
18 wt% Cr
8 wt% Ni


Wrought Aluminium Alloy
4 numbers
lead number tells main alloy element
temper designations
aircraft uses

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