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Heat transfer solution

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Drilling Laser W/mm2 106 Cutting Melting Irradiance Vaporisation 104 Welding x 50 Heating Alloying 102 Transformation Hardening Laser beam Hardened layer in cast iron – PowerPoint PPT presentation

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Title: Heat transfer solution


1
Laser Hardening of Grey Cast Iron using a High
Power Diode Laser
E. Kennedy, G. Byrne, R. Byrne
The Process
?
Rapid cooling by conduction causes self-quenching
to form hard martensite on surface
108
Shock Hardening
Drilling
Laser
W/mm2
106
Cutting
Melting
Vaporisation
104
Welding
Irradiance
x 50
Heating
Alloying
102
Transformation Hardening
Laser beam
Hardened layer in cast iron
Cladding
100
10-2
102
s
10-4
10-6
100
10-8
Interaction time t
Hardened track
Component
Fig.2 Interaction time vs. irradiance for a
number of common laser applications
Fig.1 Schematic of laser hardening process
Experimental Work
Thermodynamic modeling
Moving heat source
Heat flow in 3 dimensions

Variable thermal properties
Transient heat conduction
Heat transfer solution Finite element method
used to solve (ABAQUS)
?
Fig.4 High power diode laser hardening at UCD
Hardness Profile for Laser Hardened Cast Iron
Sample
(HRC)
Hardness
Fig.3 Visualisation of FEM model using ABAQUS
software
(µm)
?
Heating and cooling rate of various points within
the solid calculated Results compared with
published metallurgical data to predict resulting
surface structures and characteristics
Depth below surface
?
Fig.5 Typical plot of hardness vs. hardened depth
in laser hardening of cast iron
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