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Understanding thermal behavior in the LENS process

โœ Scribed by M.L Griffith; M.E Schlienger; L.D Harwell; M.S Oliver; M.D Baldwin; M.T Ensz; M Essien; J Brooks; C.V Robino; J.E Smugeresky; W.H Hofmeister; M.J Wert; D.V Nelson

Publisher
Elsevier Science
Year
1999
Weight
291 KB
Volume
20
Category
Article
ISSN
0261-3069

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โœฆ Synopsis

In direct laser metal deposition technologies, such as the laser engineered net shaping LENS process, it is important to understand and control the thermal behavior during fabrication. With this control, components can be reliably fabricated with desired material properties. This paper will describe the use of contact and imaging techniques to monitor the thermal signature during LENS processing. Development of an understanding of solidification behavior, residual stress, and microstructural evolution with respect to thermal behavior will be discussed.

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Output beam spatial properties of a dual wavelength CW DPSS laser have been studied using the thermal lens (photothermal) effect. In employing the __Z-scan__ technique both the steady-state and time-dependent thermal lens signal as a function of sample position could be examined simultaneously. The