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

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Controlling thermal deformation using a heat sink in laser transformation hardening of steel sheets

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Title
Controlling thermal deformation using a heat sink in laser transformation hardening of steel sheets
Author
Kim, SanseoSo, SangwooKi, Hyungson
Issue Date
2015-02
Publisher
ELSEVIER SCIENCE SA
Citation
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, v.216, pp.455 - 462
Abstract
Experiments were conducted using a 3 kW diode laser on 2 mm thick boron steel and DP 590 dual phase steel specimens, and four types of heat sink were considered: stainless steel 316, steel, and copper, and no heat sink. Deflection angles were measured and microstructure distributions were analyzed. When a heat sink is used, thermal deformation can be significantly reduced to the point where the direction of deflection can be reversed, and a zero deflection regime exists between the two different deflection regimes. Two different thermal deformation mechanisms are involved, plastic deformation and deformation due to martensitic phase transformation, and between them a transition regime exists. Thermal deformation in not only the laser transformation hardening process but also general laser-based sheet metal manufacturing processes can be effectively controlled.
URI
https://scholarworks.unist.ac.kr/handle/201301/9162
URL
https://www.sciencedirect.com/science/article/pii/S0924013614003811?via%3Dihub
DOI
10.1016/j.jmatprotec.2014.10.014
ISSN
0924-0136
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