Advances in Metal Processing by M. C. Flemings, R. Mehrabian (auth.), John J. Burke, Robert

By M. C. Flemings, R. Mehrabian (auth.), John J. Burke, Robert Mehrabian, Volker Weiss (eds.)

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Kou and R. Mehrabian, submitted for publication to Met. Trans. ACKNOWLEDGEMENT This research is being sponsored by the Defense Advanced Research Projects Agency and monitored by the Office of Naval Research under contract # N00014-78-C-0275. Technical monitor of the contract is Dr. B. A. MacDonald. LASER PROCESSING OF MATERIALS B. H. Kear, E. M. Breinan, & E. R. Thompson United Technologies Research Center East Hartford, Connecticut 06108 ABSTRACT This paper presents an overview of developments, old and new, in the technology of laser processing of materials including transformation hardening and surface alloying, welding, cutting, drilling, rapid solidification processing, pulse annealing, shock hardening, laser assisted machining, and laser controlled surface reactions.

L ~ w ~ 104 ONSETOF SURFACE VAPORIZATION " ABSORBED POWE~~ W/cm 2 10-4 --- THEORETICAL MAXIMUM FOR Ni '; 10-2 100 MELT DEPTH-mm Fig. 11 Effect of melt depth and absorbed power on average quench rate. 55 LASER PROCESSING OF MATERIALS .. i<'~C<: :: ,y,:g;~~{? '" . . l TLP-21 U L TRAF INE PROGAESSING SPEED ENAICHED EUTECTIC Fig. 12 MAR-M200 REFINED DENDAITIC $TAUCTUAE Microstructures of Rapid Laser Surface Me1ted and Se1f-Substrat~ Quenched A11oys. ;( a: 600 w ~ 500 w I- 400 300 10 100 TIME (SECONDS) Fig.

1 x 10- sec. Furthermore, the maximum temperature achieved at the center of the circular region would be 2238K. Results from one-dimensional heat flow analysis, when the criterion noted above is app1icable, are shown in Figures 8 to 11. Ca1culated melt depths versus total time for severa1 uniform absorbed heat fluxes are shown in Figure 8. The arrows in the figure denote times at which the surface of each material reaches it's vaporization temperature, Tv • and the heat f1ux, q, is removed. Melting continues a whi1e longer until a maximum me1t depth, zmax' is reached.

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