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Ki, Hyungson
Laser Processing & Multiphysics Systems Laboratory
Research Interests
  • Laser materials processing

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Process map for laser heat treatment of carbon steels

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Title
Process map for laser heat treatment of carbon steels
Author
Ki, HyungsonSo, Sangwoo
Keywords
Carbon diffusion; Cooling time; Diode-laser; Hardening depth; Heat conduction models; Interaction time; Laser heat treatment; Laser intensities; Optimal process; Overall characteristics; Process maps; Steel specimens; Surface hardness
Issue Date
201210
Publisher
ELSEVIER SCI LTD
Citation
OPTICS AND LASER TECHNOLOGY, v.44, no.7, pp.2106 - 2114
Abstract
We propose a process map for diode-laser heat treatment of carbon steels. After first identifying a heat treatable region in terms of laser intensity and interaction time using a heat conduction model, two most important factors in heat treatment, carbon diffusion time in austenite and cooling time, are calculated and plotted in the heat treatable region. Because overall characteristics of laser heat treatment for a given steel type can be graphically visualized on a map, this map can be used in the determination of optimal process parameters. Hardening depth is also calculated using the concept of the critical effective carbon diffusion time. For demonstration and validation purposes, we have systematically conducted laser heat treatment on AISI 1020 and 1035 steel specimens using a 3 kW diode laser and measured surface hardness and hardening depth. The experimental results are in agreement with the calculated process map.
URI
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DOI
http://dx.doi.org/10.1016/j.optlastec.2012.03.018
ISSN
0030-3992
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