A novel laser surface processing technique for additive layer manufacturing

2016 ◽  
Vol 2016 (0) ◽  
pp. 302
Author(s):  
Terutake Hayashi ◽  
Hideaki Yokoo ◽  
Syuhei Kurokawa ◽  
Keigo Matsunaga ◽  
Wang Chengwu ◽  
...  
Keyword(s):  
Processing Technique ◽  
Laser Surface ◽  
Surface Processing ◽  
Additive Layer Manufacturing ◽  
Layer Manufacturing

scholarly journals Thermal model with phase change for process parameter determination in laser surface processing

2010 ◽  
Vol 5 ◽  
pp. 395-403 ◽  
Author(s):  
E. Ukar ◽  
A. Lamikiz ◽  
L.N. López de Lacalle ◽  
S. Martinez ◽  
F. Liébana ◽  
...  
Keyword(s):  
Phase Change ◽  
Thermal Model ◽  
Process Parameter ◽  
Laser Surface ◽  
Parameter Determination ◽  
Surface Processing

Topology Optimization, Additive Layer Manufacturing, and Experimental Testing of an Air-Cooled Heat Sink

2015 ◽  
Vol 137 (11) ◽  
Author(s):  
Ercan M. Dede ◽  
Shailesh N. Joshi ◽  
Feng Zhou
Keyword(s):  
Topology Optimization ◽  
Heat Sink ◽  
Computer Aided Design ◽  
Experimental Testing ◽  
Jet Impingement ◽  
Coefficient Of Performance ◽  
Air Cooling ◽  
Additive Layer Manufacturing ◽  
Cloud Data ◽  
Layer Manufacturing

Topology optimization of an air-cooled heat sink considering heat conduction plus side-surface convection is presented. The optimization formulation is explained along with multiple design examples. A postprocessing procedure is described to synthesize manifold or “water-tight” solid model computer-aided design (CAD) geometry from three-dimensional (3D) point-cloud data extracted from the optimization result. Using this process, a heat sink is optimized for confined jet impingement air cooling. A prototype structure is fabricated out of AlSi12 using additive layer manufacturing (ALM). The heat transfer and fluid flow performance of the optimized heat sink are experimentally evaluated, and the results are compared with benchmark plate and pin-fin heat sink geometries that are conventionally machined out of aluminum and copper. In two separate test cases, the experimental results indicate that the optimized ALM heat sink design has a higher coefficient of performance (COP) relative to the benchmark heat sink designs.

scholarly journals Metallurgical Aspects of Laser Surface Processing of PM Cr-V Ledeburitic Steel

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Peter Jurči ◽  
Jiři Cejp ◽  
Jan Brajer
Keyword(s):  
Solid Solution ◽  
Light Microscopy ◽  
Retained Austenite ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Surface Processing ◽  
Microstructural Changes ◽  
Type Steel ◽  
Eds Microanalysis

The Vanadis 6 ledeburitic-type steel was laser surface remelted. Microstructural changes and hardness in laser affected material were investigated using light microscopy, SEM, and EDS-microanalysis. It was found that the laser surface melting and subsequent rapid solidifying led to softening of the material, due to presence of retained austenite. The melting of the material begins with the transformation of M7C3-carbide into a liquid and finishes via the dissolution of primary solid solution grains. The solidification proceeded in a reverse manner while the eutectics became often so-called degenerous form.

Laser Surface Processing for Tailoring of Properties by Optimization of Microstructure

2016 ◽  
pp. 121-171
Author(s):  
Jyotsna Dutta Majumdar ◽  
Andreas Weisheit ◽  
I. Manna
Keyword(s):  
Surface Region ◽  
Laser Surface ◽  
Processing Route ◽  
Surface Microstructure ◽  
High Power Laser ◽  
Surface Processing ◽  
Present Contribution ◽  
Near Surface ◽  
Rapid Processing ◽  
Equilibrium Microstructure

Laser surface processing involves modification of surface microstructure and/or composition of the near surface region of a component using a high power laser beam. The advantages of laser surface processing over conventional equilibrium surface processing include rapid processing rate, retention of non-equilibrium microstructure, alloying in liquid state and development of processed zone with superior properties as compared to the same developed by equilibrium processing route. Microstructure plays an important role to control the final properties of the tailored component. In the present contribution, with a brief introduction to laser, and its application, the microstructures developed under optimum conditions by different laser surface processing will be discussed with the corresponding improvement in properties. Finally, a brief review of the future scope of research in laser surface processing will be presented.

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