Theoretical and experimental studies on laser transformation hardening of steel by customized beam

Michael K.H. Leung, Hau Chung Man, J. K. Yu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

44 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)4600-4606
Number of pages7
JournalInternational Journal of Heat and Mass Transfer
Issue number23-24
Publication statusPublished - 1 Nov 2007


  • Exact solution
  • Flat-top rectangular beam
  • Laser transformation hardening
  • Moving phase-change interface

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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