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TECHNICAL PAPERS: Heat Transfer in Manufacturing Processes

An Experimental Investigation of Heat Affected Zone Formation and Morphology Development During Laser Processing of Metal Powder Mixtures

[+] Author and Article Information
C. W. Buckley

e-mail: jandb@neca.com

T. L. Bergman

Department of Mechanical Engineering, The University of Connecticut, Storrs, CT 06268

J. Heat Transfer 123(3), 586-592 (Dec 14, 2000) (7 pages) doi:10.1115/1.1370508 History: Received June 26, 2000; Revised December 14, 2000
Copyright © 2001 by ASME
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References

Figures

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Micrographs of the nickel braze powder (top) and AISI 1018 carbon steel powder (bottom)
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Micrographs of a cross section of a HAZ. Note the high porosity (dark) regions evident under low magnification (top). Note the unmolten AISI steel with surrounding resolidified nickel braze (bottom left) and the wetting of the solid steel particle by the molten nickel (bottom right).
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Predicted and measured onset of melting for the nickel powder
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Predicted and measured onset of melting for the nickel powder with dependence of η with Sz. η=0.02746+0.00012 Sz for 22<Sz<4100.
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Observed HAZ morphologies for (top to bottom) X=0.3, 0.5, 0.7, and 1. Bi=19,Pe=1.1,Sz=22.
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Observed HAZ morphologies for (top to bottom) X=0.3, 0.5, 0.7, and 1. Bi=15,Pe=35,Sz=21,000.
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Classification of 6 major HAZ morphologies. Top to bottom: grooved, sponge, herringbone, tube, pin, balled. The HAZ is shown in top view in the powder (left), top view out of the powder (middle) and side view (right).
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Process map for 0.3≤X≤0.7

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