期刊
OPTICS AND LASER TECHNOLOGY
卷 63, 期 -, 页码 154-168出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2014.04.016
关键词
High power direct diode laser; Laser cladding; Residual stress
资金
- NSF [IIP-1034562]
- Div Of Industrial Innovation & Partnersh
- Directorate For Engineering [1034652] Funding Source: National Science Foundation
High-power direct diode laser (HPDDL) cladding offers several advantages in the laser surface modification and repair of high-value parts. The wider beam and uniform energy distribution in the direct diode laser provide a smooth heating and cooling cycle during the cladding process. Subsequently, lower dimensional distortion and thermally-induced stress occur during the process. In this paper, temperature evolution and molten pool dimensions as well as stress-and-strain fields were studied by utilizing experimental and numerical methods. A three-dimensional (3D) transient uncoupled thermo-elastic-plastic model was developed to simulate a thermal process during the single- and multi-track laser cladding and the thermally-induced residual stress in the laser cladding. The effect of latent heat and phase transformations are considered in the thermal analysis. The numerical results were validated by experimentally-measured values, and the maximum prediction error was 3.5%. The experimental results were collected by in-situ monitoring techniques (e.g., thermocouples and a high-speed CCD camera). The level of residual stresses at the cladded surfaces were measured by an X-ray diffractometer. In addition, the effect of scanning speed on the thermal and stress evolution was quantitatively discussed. (C) 2014 Elsevier Ltd. All rights reserved.
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