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TECHNICAL PAPERS

Heat Treatment of Metal Surfaces by a Conformal Electron Beam

[+] Author and Article Information
Shengyi Liu, Roger A. Dougal

Department of Electrical Engineering, University of South Carolina, Columbia, SC 29208

Jed S. Lyons

Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208

J. Eng. Mater. Technol 123(2), 210-215 (Sep 15, 2000) (6 pages) doi:10.1115/1.1338480 History: Received July 22, 1999; Revised September 15, 2000
Copyright © 2001 by ASME
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References

Figures

Grahic Jump Location
Time to 99% austenite formation for isothermal heating of AISI 4142 (heating rate=1020°C/s). The upper and lower critical temperatures are Ac3=802°C,Ac1=749°C. Data from Melander and Nicolov 4.
Grahic Jump Location
Time to 99% austenite formation for isothermal heating of AISI 4142 as obtained from Eq. (1)
Grahic Jump Location
Normalized energy deposition as a function of penetration depth for three incident electron energies. The material is assumed to be AISI 4140 with ρm=7.844 g/cm3,〈Z〉=26.0,〈At〉=55.9.
Grahic Jump Location
Normalized temperature variations as a function of time at 1 μm beneath the surface. T1n, Eq. (8), corresponds to a plane source, T3n, Eq. (9), a point source. Material AISI 4140 with ρm=7.844 g/cm3,κ=0.25 J/(cm⋅s⋅°C),c=0.67 J/(g⋅°C).
Grahic Jump Location
Temperature distributions at different times according to Eq. (16). Electron beam current 4.25 kA/cm2 , sheath voltage 1 MV, beam duration 100 ns; material AISI 4140 with ρm=7.844 g/cm3,κ=0.25 J/(cm⋅s⋅°C),c=0.67 J/(g⋅°C).
Grahic Jump Location
Temperature distributions for different electron beam currents at t=1 μs according to Eq. (16). Sheath voltage 1 MV, beam duration 100 ns; material AISI 4140 with ρm=7.844 g/cm3,κ=0.25 J/(cm⋅s⋅°C),c=0.67 J/(g⋅°C).
Grahic Jump Location
Time variation of temperature at the surface and at three depths below the surface according to Eq. (16). Electron beam current density 4.25 kA/cm2 , sheath voltage 1 MV, beam duration 100 ns; material AISI 4140 with ρm=7.844 g/cm3,κ=0.25 J/(cm⋅s⋅°C),c=0.67 J/(g⋅°C).
Grahic Jump Location
The performance of a heat-reflecting boundary is like a source that is the image of the initial source. The image and the initial source are symmetric with respect to the boundary.

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