presentation on IFHS STEEL
-
Upload
kiran-kumar -
Category
Documents
-
view
218 -
download
0
Transcript of presentation on IFHS STEEL
-
7/23/2019 presentation on IFHS STEEL
1/15
KIRANKUMAR
MTECH(materials eng.)
-
7/23/2019 presentation on IFHS STEEL
2/15
Deformation
Recovery
Re-crystallization
Recovery kinetics
Re-crystallization kinetics
Discussion
Conclusion
-
7/23/2019 presentation on IFHS STEEL
3/15
Plastic deformation
Change in dimensionof metal under load
Change in grainsize, strength,
number ofdislocation
Increase in hardness,strength, decreases
ductility
Deformation
Elasticdeformation
Teture
-
7/23/2019 presentation on IFHS STEEL
4/15
!efore cold "ork #fter cold "ork
-
7/23/2019 presentation on IFHS STEEL
5/15
Dislocations allow deformation at much lowerstress
than in a perfect crystal
-
7/23/2019 presentation on IFHS STEEL
6/15
O% cold work micro structure of IF-HS
#fter $%& cold "ork 'I(-)*+
-
7/23/2019 presentation on IFHS STEEL
7/15
Recovery
Restoration of hysicalroerties cold "orkedmetal "ithout changein microstructure
Change inhysical,
mechanicalroerties
Increase inelectrical
thermalconductivity
#nnealing
Re-crystallization
.rain.ro"th
-
7/23/2019 presentation on IFHS STEEL
8/15
Highlyrecovered
Some recovery
Recovery
-
7/23/2019 presentation on IFHS STEEL
9/15
Recovery kinetics rate of recovery inversely proportional to
annealing time d /dt = -/t
=!- ln t " w#ere "!are constant -y =$%&'()/*
w#ere $ depends on material
is constant
& is elastic s#ear modulus
' is 'urger+s vector is applied stress
yis yield stress of crystalli,ed material
-
7/23/2019 presentation on IFHS STEEL
10/15
Re-
crystallizationRelacement of
cold "orkedstructure by ne"set of strain-free
grains
*tored energy isdriving force forrecovery re-crystallization
increase in area of grainboundary due to increase
in grain size
/inimum
amount ofdeformationis needed forrecrystallizati
on
Decrease in hardness strength , increasein ductility , density
of dislocation
decrease
heterogeneou
s
-
7/23/2019 presentation on IFHS STEEL
11/15
Factors inuencerecrystallization
#mount ofdeformation
Time
TemeratureInitial grain size
Comosition
#mount ofrecovery
-
7/23/2019 presentation on IFHS STEEL
12/15
E0ects of cold "ork are reversed1
-
7/23/2019 presentation on IFHS STEEL
13/15
conclusionnergy stored is driving force for recovery " re-
crystalli,ation.ecovery 'y release of stored energy
ovement of dislocation into su'-grain
inimum amount of deformation need for re-crystalli,ation
/#ermal cycling t#roug# #ig# temperature leads recovery
structure
-
7/23/2019 presentation on IFHS STEEL
14/15
Publication0Effect of mode of rolling on re-crystallizationkinetics and microstructure evolution in IFHS steel sheet, ISIJinternational , vol!"#$%&"',(o$,))"!*-"*+
E)erience0 One year work e1perience on 2F/ t#eory
Publication Effect of .oic gas #/l$' on Electronic and.rans)ort )ro)erties of 0igzag 1oron (itride (ano 2ibbon First
)rinci)les study #under review'
-
7/23/2019 presentation on IFHS STEEL
15/15
THANKS A LOT
ANY QUESTION
PLEASE