dr. eng. hamed a. nagy haz and heat input. dr. eng. hamed a. nagy basic metal structures i. pure...
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Dr. Eng. Hamed A. Nagy
HAZ and Heat Input
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Dr. Eng. Hamed A. Nagy
Basic Metal Structures
I. Pure Metal II. Substitutional Atom III. Interstitial Atom
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Dr. Eng. Hamed A. Nagy
Basic Metal Structures
I. Simple Cubic II. Body Centered Cubic
(BCC)
III. Face Centered Cubic
(FCC)
Al, Cu, NiFe, Cr
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Dr. Eng. Hamed A. Nagy
Iron-Carbon Diagram
%C
Tem
per
atu
re
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Dr. Eng. Hamed A. Nagy
Mechanical Mixtures
Coarse Pearlite
Slow Cooling
High Ductility
Low Strength
Fine Pearlite
Moderate Cooling
Moderate Ductility
Moderate Strength
Bainite
Rapid Cooling
Low Ductility
High Strength
Lamellar
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Dr. Eng. Hamed A. Nagy
Martensite
Very Rapid Cooling Martensite
Carbon has no chance to diffuse
Metastable Phase
Acicular (Needle) Structure
Lowest Ductility
Highest Strength
Body Centered Tetragonal BCT
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Dr. Eng. Hamed A. Nagy
Tempered Martensite
Heating from Martensite
Carbon gets able to diffuse
Some relaxation.
Restore ductility
Keep strength at moderate levels
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Dr. Eng. Hamed A. Nagy
HT
Time
Tem
per
atu
re
Annealing
Normalizing
Oil Quenching
Water Quenching
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Dr. Eng. Hamed A. Nagy
HT
Tem
per
atu
re
Tempering
Time
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Dr. Eng. Hamed A. Nagy
Solidification
Coarse Grain Size
Fine Grain Size
Liquid
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Dr. Eng. Hamed A. Nagy
Solidification
Dendrites
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Dr. Eng. Hamed A. Nagy
Welding Zones
%C
Tem
per
atu
re
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Dr. Eng. Hamed A. Nagy
Welding ZonesT
empe
ratu
re
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Dr. Eng. Hamed A. Nagy
Welding ZonesT
empe
ratu
re
Preheat
HAZ Temp.
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Dr. Eng. Hamed A. Nagy
Welding Zones
Two factors can control the rate of cooling:
1- Heat Input
a) Power
b) Traveling Speed
2- Preheat
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Dr. Eng. Hamed A. Nagy
Welding Zones
Three factors can not be controlled:
1- Carbon Equivalent
2- Thickness
3- Thermal Conductivity.
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Dr. Eng. Hamed A. Nagy
HAZ
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Dr. Eng. Hamed A. Nagy
HAZ and Heat Input
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Dr. Eng. Hamed A. Nagy
HAZ and Heat Input
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Dr. Eng. Hamed A. Nagy
HAZ and Heat Input
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Dr. Eng. Hamed A. Nagy
LBZ
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Dr. Eng. Hamed A. Nagy
HAZ (Grain Growth Diagram)
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Dr. Eng. Hamed A. Nagy
Distortion and Residual Stresses
Without Clamping
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Dr. Eng. Hamed A. Nagy
Distortion and Residual Stresses
Strain
Stress
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Dr. Eng. Hamed A. Nagy
Distortion and Residual Stresses
Strain
Stress
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Dr. Eng. Hamed A. Nagy
Distortion and Residual Stresses
Strain
Stress