Laser transformation hardening using customised laser beam intensity profiles
- 1 January 2004
- conference paper
- conference paper
- Published by Laser Institute of America in Pacific International Conference on Applications of Lasers and Optics
- Vol. 2004 (1), 707
- https://doi.org/10.2351/1.5056121
Abstract
This research investigates how laser transformation hardening is improved if the laser beam intensity profile is designed to produce the ideal temperature distribution in the work-piece. The use of diffractive optical kinoform allows the laser beam intensity profile to be highly customized and so optimise the process.A simple heat flow model was employed to design the beam intensity profile used to generate the temperature distribution in the substrate. Laser transformation hardening experiments were carried out on 0.4% plain carbon steel and 1.5% nickel-chromium-molybdenum low alloy steel using customized laser beam profiles at different incident beam power and scanning rates.An even surface hardening profile could be accomplished with sharper edges to the laser hardened zone than achieved without complex beam shaping. Optimisation the temperature distribution as the beam passes over the work-piece, allows carbon dissolution to be ensure as the homogenous austenitic transformation can be achieved without...Keywords
This publication has 7 references indexed in Scilit:
- Laser Material ProcessingPublished by Springer Science and Business Media LLC ,1998
- Computer-generated microcooled reflection holograms in silicon for material processing with a CO_2 laserApplied Optics, 1997
- Diffractive optical elements for manipulation of high-power CO2 laser radiation: a feasibility studyPublished by SPIE-Intl Soc Optical Eng ,1996
- Low power laser heat treatment to improve fatigue life of low carbon steelJournal of Laser Applications, 1996
- Laser transformation hardening of tempered 4340 steelMetallurgical Transactions A, 1992
- The relationship between hardness and laser treatment of hypo-eutectoid steelsScripta Metallurgica, 1987
- The transformation hardening of steel surfaces by laser beams—I. Hypo-eutectoid steelsActa Metallurgica, 1984