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

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

doi:10.1016/j.ijheatmasstransfer.2007.03.022

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 publication › Journal article › Academic research › peer-review

48 Citations (Scopus)

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.

Original language	English
Pages (from-to)	4600-4606
Number of pages	7
Journal	International Journal of Heat and Mass Transfer
Volume	50
Issue number	23-24
DOIs	https://doi.org/10.1016/j.ijheatmasstransfer.2007.03.022
Publication status	Published - 1 Nov 2007

Keywords

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

More information

10.1016/j.ijheatmasstransfer.2007.03.022

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title = "Theoretical and experimental studies on laser transformation hardening of steel by customized beam",

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.",

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AU - Man, Hau Chung

AU - Yu, J. K.

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N2 - 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.

AB - 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.

KW - Exact solution

KW - Flat-top rectangular beam

KW - Laser transformation hardening

KW - Moving phase-change interface

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EP - 4606

JO - International Journal of Heat and Mass Transfer

JF - International Journal of Heat and Mass Transfer

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ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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