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Enhancement of the wear resistance and microhardness of aluminum alloy by Nd:YaG laser treatment.

Hussein HT, Kadhim A, Al-Amiery AA, Kadhum AA, Mohamad AB - ScientificWorldJournal (2014)

Bottom Line: The specimens were machined as a disk with diameter of 25 mm and circular groove in depth of 3 mm.All specimens were conducted by scanning electron microscopy (SEM), energy-dispersive X-ray fluorescence analysis (EDS), optical microscopy, and Vickers hardness.The results showed that the dry wear rate was decreased after laser hardening and increased Vickers hardness values by ratio of 2.4:1.

View Article: PubMed Central - PubMed

Affiliation: Applied Science Department, University of Technology, Baghdad 10066, Iraq.

ABSTRACT
Influence of laser treatment on mechanical properties, wear resistance, and Vickers hardness of aluminum alloy was studied. The specimens were treated by using Nd:YaG laser of energy 780 mj, wavelength 512 nm, and duration time 8 ns. The wear behavior of the specimens was studied for all specimens before and after treatment by Nd:YaG laser and the dry wear experiments were carried out by sing pinon-disc technique. The specimens were machined as a disk with diameter of 25 mm and circular groove in depth of 3 mm. All specimens were conducted by scanning electron microscopy (SEM), energy-dispersive X-ray fluorescence analysis (EDS), optical microscopy, and Vickers hardness. The results showed that the dry wear rate was decreased after laser hardening and increased Vickers hardness values by ratio of 2.4:1. The results showed that the values of wear rate for samples having circular grooves are less than samples without grooves after laser treatment.

Show MeSH
Wear rate (gm/cm) versus sliding time before laser surface treatment under load of 5 N.
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Related In: Results  -  Collection


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fig3: Wear rate (gm/cm) versus sliding time before laser surface treatment under load of 5 N.

Mentions: Figures 3 and 4 show the relation between the dry wear rate and the sliding time under constant load of (5 N). One can be shown that the wear rate reduced after harding by laser because the hardness values for all samples have been increased after treated by laser; this behavior due to the energy is transferred to the metal, and the material surface originates a phase transformation from solid to vapor state. The plasma is an outcome of the gas phase, which absorbs the energy directly from the laser radiation.


Enhancement of the wear resistance and microhardness of aluminum alloy by Nd:YaG laser treatment.

Hussein HT, Kadhim A, Al-Amiery AA, Kadhum AA, Mohamad AB - ScientificWorldJournal (2014)

Wear rate (gm/cm) versus sliding time before laser surface treatment under load of 5 N.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4127256&req=5

fig3: Wear rate (gm/cm) versus sliding time before laser surface treatment under load of 5 N.
Mentions: Figures 3 and 4 show the relation between the dry wear rate and the sliding time under constant load of (5 N). One can be shown that the wear rate reduced after harding by laser because the hardness values for all samples have been increased after treated by laser; this behavior due to the energy is transferred to the metal, and the material surface originates a phase transformation from solid to vapor state. The plasma is an outcome of the gas phase, which absorbs the energy directly from the laser radiation.

Bottom Line: The specimens were machined as a disk with diameter of 25 mm and circular groove in depth of 3 mm.All specimens were conducted by scanning electron microscopy (SEM), energy-dispersive X-ray fluorescence analysis (EDS), optical microscopy, and Vickers hardness.The results showed that the dry wear rate was decreased after laser hardening and increased Vickers hardness values by ratio of 2.4:1.

View Article: PubMed Central - PubMed

Affiliation: Applied Science Department, University of Technology, Baghdad 10066, Iraq.

ABSTRACT
Influence of laser treatment on mechanical properties, wear resistance, and Vickers hardness of aluminum alloy was studied. The specimens were treated by using Nd:YaG laser of energy 780 mj, wavelength 512 nm, and duration time 8 ns. The wear behavior of the specimens was studied for all specimens before and after treatment by Nd:YaG laser and the dry wear experiments were carried out by sing pinon-disc technique. The specimens were machined as a disk with diameter of 25 mm and circular groove in depth of 3 mm. All specimens were conducted by scanning electron microscopy (SEM), energy-dispersive X-ray fluorescence analysis (EDS), optical microscopy, and Vickers hardness. The results showed that the dry wear rate was decreased after laser hardening and increased Vickers hardness values by ratio of 2.4:1. The results showed that the values of wear rate for samples having circular grooves are less than samples without grooves after laser treatment.

Show MeSH