The Effects of Nd:YAG Laser Surface Melting Parameters on the Solidification Behavior of Aluminium Surface

2012 ◽  
Vol 1 (3) ◽  
pp. 239-244
Author(s):  
P. Omranian ◽  
H. R. Shahverdi ◽  
M. J. Torkamany ◽  
S. A. Vaziri
Keyword(s):  
Nd:Yag Laser ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Solidification Behavior

Development of Nano-Structured Aluminum Surfaces by LSM

2008 ◽  
Author(s):  
Taha Mattar ◽  
Ehab Abdel Rahman ◽  
Ahmed Abdel-Aziz ◽  
Haytham El-Gazzar
Keyword(s):  
Corrosion Resistance ◽  
Surface Layer ◽  
Surface Structure ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Aluminum Surface ◽  
Yag Laser ◽  
Structured Surface ◽  
Aluminum Surfaces

Aluminum is one of most common metals in all advanced and modern scientific and technological applications including electrical, electronic, chemical, engineering, energy and medical fields. The performance of aluminum alloys determines to large extent the quality and economic status of the different processes. Aluminum surface structure determine its performance where nano sized grains and layer can improve aluminum properties and performance. In this work, the improvement of aluminum surface structure and formation of nano structured surface grains by laser surface melting (LSM) using Nd-YAG laser under argon atmosphere was investigated. Different power and scanning speed were applied. The physical and chemical properties of the produced surfaces were examined. SEM, EDX and XRD analyses were performed and were correlated to hardness results. Corrosion resistance of the treated surface was investigated to evaluate their performance in aggressive media and chemical and medical applications. From the obtained data it can be concluded that Nd-YAG laser surface melting of aluminum results in formation of 750 micron nano-structured surface layer. Adjustment of LSM parameters could produce 100 nm grains or less. The obtained results showed also that LSM under argon can eliminate the formation of Al2O3 surface layer which may deteriorates the performance in certain applications. Surface layer rich in AlN is formed upon LSM. It was concluded also that corrosion resistance of the treated aluminum surfaces was improved to large extent by LSM.

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.

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