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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The relationship between these two absorbed heat flux distributions is shown in Figure 6. If we assume that the total power absorbed, Q, in the circular region is identical for the uniform and the Gaussian heat f1ux distributions, as shown in Figure 6, then the fo110wing relationship is readily deduced: (8) where qQ is the absorbed heat f1ux at the center of the circu1ar region ln the Gaussian distribution. In wh~t fo110ws we will first consider one and two-dimensiona1 heat flow for the case of uniform absorbed heat f1ux before treating the more comp1ex Gaussian heat flux distribution.

A variety of meta11urgica1 microstructures have been produced by 1aserg1azing, some of which are unique. These inc1ude amorphous metallic solids, extended (supersaturated) solid solution phases, metastab1e phases, ultrafine eutectics, and refined dendritic structures, Fig. 12. Potential app1ications are current1y being eva1uated. An interesting case is the use of laser surface melting to combat stress corrosion cracking in 'sensitized' 304 stain1ess stee1 (22). This is achieved by adjusting the coo1ing rate to avoid the formation of a harmfu1 carbide phase at the grain boundaries, Fig.

High eooling rates during solidifieation are only aehieved at the expense of high absorbed he at fluxes, redueed heat affeeted zones and melt depths. g. the radius) of the surfaee melted region. REFERENCES 1. C. G. Levi, R. Mehrabian, submitted for publieation to Met. Trans. 2. R. Mehrabian; Proeeedings of Conferenee on Rapid Solidifieation Proeessing, Prineiples and Teehnologies, Nov. 1977, Reston, Virginia, p. 7. R. Mehrabian, B. H. Kear and M. , Claitor Publishing Division, 1978. RAPID SOLIDIFICATION PROCESSING 43 3.

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