Effect of laser power and powder flow rate on dilution rate and surface finish produced during laser metal deposition of titanium alloy
- Mahamood, Rasheedat M., Akinlabi, Esther Titilayo, Owolabi, Moses G.
- Authors: Mahamood, Rasheedat M. , Akinlabi, Esther Titilayo , Owolabi, Moses G.
- Date: 2017
- Subjects: Component , Additive manufacturing , Dilution
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/237440 , uj:24326 , Citation: Mahamood, R.M., Akinlabi, E.T. & Owolabi, M.G. 2017. Effect of laser power and powder flow rate on dilution rate and surface finish produced during laser metal deposition of titanium alloy.
- Description: Abstract: The influence of processing parameters on the resulting properties of laser metal deposition process cannot be overemphasized. In this research, the influence of laser power and powder flow rate on the dilution and surface roughness value produced are critically studied.. The laser power was set between 1.8 kW and 3.0 kW, while the powder flow rate was set between 2.88 and 5.76 g/min. The scanning speed and the gas flow rate were maintained at constant values of 0.05m/s and 4l/min respectively. The study revealed that, as the laser power was increased, the degree of dilution increases but the average surface roughness value decreases. Also, as the powder flow rate was increased, the dilution decreases and the average surface roughness increases. The study shows that it is important to keep the powder flow rare low so as to achieve a better surface finished and also not to use too high laser power as this will result in higher dilution, which is not desirable in the laser additive manufacturing process because it will affect the dimensional accuracy of the part under processing.
- Full Text:
- Authors: Mahamood, Rasheedat M. , Akinlabi, Esther Titilayo , Owolabi, Moses G.
- Date: 2017
- Subjects: Component , Additive manufacturing , Dilution
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/237440 , uj:24326 , Citation: Mahamood, R.M., Akinlabi, E.T. & Owolabi, M.G. 2017. Effect of laser power and powder flow rate on dilution rate and surface finish produced during laser metal deposition of titanium alloy.
- Description: Abstract: The influence of processing parameters on the resulting properties of laser metal deposition process cannot be overemphasized. In this research, the influence of laser power and powder flow rate on the dilution and surface roughness value produced are critically studied.. The laser power was set between 1.8 kW and 3.0 kW, while the powder flow rate was set between 2.88 and 5.76 g/min. The scanning speed and the gas flow rate were maintained at constant values of 0.05m/s and 4l/min respectively. The study revealed that, as the laser power was increased, the degree of dilution increases but the average surface roughness value decreases. Also, as the powder flow rate was increased, the dilution decreases and the average surface roughness increases. The study shows that it is important to keep the powder flow rare low so as to achieve a better surface finished and also not to use too high laser power as this will result in higher dilution, which is not desirable in the laser additive manufacturing process because it will affect the dimensional accuracy of the part under processing.
- Full Text:
Process parameter interaction effect on the evolving properties of laser metal deposited titanium for biomedical applications
- Nyoni, Ezekiel, Akinlabi, Esther Titilayo
- Authors: Nyoni, Ezekiel , Akinlabi, Esther Titilayo
- Date: 2016
- Subjects: Biocompatibility , Dilution , Laser metal deposition
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/216973 , uj:21580 , Citation: Nyoni, E & Akinlabi, E.T. 2016. Process parameter interaction effect on the evolving properties of laser metal deposited titanium for biomedical applications.
- Description: Abstract: The laser power interaction effects on the evolving properties of commercially pure titanium during laser metal deposition were analysed. The optimized processing parameters obtained for this research study were, spot size of 4 mm, powder flow rate of 2 g/min, gas flow rate of 2 l/min, and the scanning speed set at 0.002m/s. A total of seven samples were fabricated by depositing titanium powder onto a Ti-6Al-4V base metal; using an Nd-Yag laser by varying the laser power from 400 to 1600 watts while keeping all the other parameters constant. The deposited samples were characterised through the evolving microstructure, microhardness, wear and the corrosion behaviour. The microstructural evaluation revealed that the ratio of dilution increased with an increase in the laser power. Furthermore, it was found that as the dilution increased, the wear resistance behaviour of the deposits decreased due to the increased foreign elements (Al and V) from the substrate which inhibited smooth fusion as the molten deposit cooled...
- Full Text:
- Authors: Nyoni, Ezekiel , Akinlabi, Esther Titilayo
- Date: 2016
- Subjects: Biocompatibility , Dilution , Laser metal deposition
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/216973 , uj:21580 , Citation: Nyoni, E & Akinlabi, E.T. 2016. Process parameter interaction effect on the evolving properties of laser metal deposited titanium for biomedical applications.
- Description: Abstract: The laser power interaction effects on the evolving properties of commercially pure titanium during laser metal deposition were analysed. The optimized processing parameters obtained for this research study were, spot size of 4 mm, powder flow rate of 2 g/min, gas flow rate of 2 l/min, and the scanning speed set at 0.002m/s. A total of seven samples were fabricated by depositing titanium powder onto a Ti-6Al-4V base metal; using an Nd-Yag laser by varying the laser power from 400 to 1600 watts while keeping all the other parameters constant. The deposited samples were characterised through the evolving microstructure, microhardness, wear and the corrosion behaviour. The microstructural evaluation revealed that the ratio of dilution increased with an increase in the laser power. Furthermore, it was found that as the dilution increased, the wear resistance behaviour of the deposits decreased due to the increased foreign elements (Al and V) from the substrate which inhibited smooth fusion as the molten deposit cooled...
- Full Text:
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