Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/24101
Title: Theoretical and experimental studies on laser transformation hardening of steel by customized beam
Authors: Leung, MKH
Man, HC 
Yu, JK
Keywords: Exact solution
Flat-top rectangular beam
Laser transformation hardening
Moving phase-change interface
Issue Date: 2007
Publisher: Pergamon Press
Source: International journal of heat and mass transfer, 2007, v. 50, no. 23-24, p. 4600-4606 How to cite?
Journal: International journal of heat and mass transfer 
Abstract: An exact solution was developed for a quasi-steady-moving-interface heat transfer problem in laser transformation hardening by a beam customized to a flat-top rectangular shape. The absorption and release of the latent heat were taken into account. The solution provided the body temperature, heating rate, and subsequent cooling rate. Using the IT and CCT diagrams, the rapid austenitization and pearlitic/martensitic phase transformation were determined for prediction of the hardening effect. In the experimental study, a diffractive optical kinoform (DOK) was used to customize a conventional Gaussian laser spot beam to a flat-top rectangular beam. A reasonable agreement between the theoretical predictions and the experimental measurements was obtained.
URI: http://hdl.handle.net/10397/24101
ISSN: 0017-9310
EISSN: 1879-2189
DOI: 10.1016/j.ijheatmasstransfer.2007.03.022
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