Gas flow rate and scanning speed influence on microstructure and microhardness property of laser metal deposited titanium-alloy
- Mahamood, Rasheedat M., Akinlabi, Esther Titilayo
- Authors: Mahamood, Rasheedat M. , Akinlabi, Esther Titilayo
- Date: 2017
- Subjects: Additive Manufacturing , Gas flow rate , Laser Metal Deposition
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/244682 , uj:25307 , Citation: Mahamood, R.M. & Akinlabi, E.T. 2017. Gas flow rate and scanning speed influence on microstructure and microhardness property of laser metal deposited titanium-alloy.
- Description: Abstract: Laser metal deposition process is an additive manufacturing technology that is capable of producing three dimensional components as well as repair of an existing worn out components. Processing parameters play an important role on the resulting properties of the processed materials using the laser metal deposition process. This study investigates the influence of gas flow rate and scanning speed on the microstructural and microhardness properties of laser metal deposited Ti6Al4V, an important titanium alloy used in the aerospace industries. Nd-YAG laser was used in this work with the maximum laser power of 4.0 kW. The laser power used was 3.0 kW and the powder flow rate of 2.88 g/min was maintained throughout the experiments. The scanning speed was set between 0.01 and 0.04 m/s while the gas flow rate was varied between 1 and 4 l/min. The microstructures of the samples were studied using optical microscope while the microhardness profiling was conducted using microhardness indenter. The results showed that, as the scanning speed was increased, the microstructure changed from fine basketweave structure to coarse martensitic structure. The microhardness was found to increase with increasing scanning speed. By increasing the gas flow rate results in decrease in microhardness values while the microstructure was observed to change from martensitic structure to basketweave structure. The result from this study is especially useful in repair application in order to achieve the desired properties.
- Full Text:
- Authors: Mahamood, Rasheedat M. , Akinlabi, Esther Titilayo
- Date: 2017
- Subjects: Additive Manufacturing , Gas flow rate , Laser Metal Deposition
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/244682 , uj:25307 , Citation: Mahamood, R.M. & Akinlabi, E.T. 2017. Gas flow rate and scanning speed influence on microstructure and microhardness property of laser metal deposited titanium-alloy.
- Description: Abstract: Laser metal deposition process is an additive manufacturing technology that is capable of producing three dimensional components as well as repair of an existing worn out components. Processing parameters play an important role on the resulting properties of the processed materials using the laser metal deposition process. This study investigates the influence of gas flow rate and scanning speed on the microstructural and microhardness properties of laser metal deposited Ti6Al4V, an important titanium alloy used in the aerospace industries. Nd-YAG laser was used in this work with the maximum laser power of 4.0 kW. The laser power used was 3.0 kW and the powder flow rate of 2.88 g/min was maintained throughout the experiments. The scanning speed was set between 0.01 and 0.04 m/s while the gas flow rate was varied between 1 and 4 l/min. The microstructures of the samples were studied using optical microscope while the microhardness profiling was conducted using microhardness indenter. The results showed that, as the scanning speed was increased, the microstructure changed from fine basketweave structure to coarse martensitic structure. The microhardness was found to increase with increasing scanning speed. By increasing the gas flow rate results in decrease in microhardness values while the microstructure was observed to change from martensitic structure to basketweave structure. The result from this study is especially useful in repair application in order to achieve the desired properties.
- Full Text:
Effect of scanning speed and gas flow rate on surface roughness of LMD titanium-alloy
- Mahamood, Rasheedat M., Akinlabi, Esther Titilayo
- Authors: Mahamood, Rasheedat M. , Akinlabi, Esther Titilayo
- Date: 2016
- Subjects: Additive Manufacturing , Laser Metal Deposition (LMD) , Process parameter
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/214824 , uj:21329 , Citation: Mahamood, R.M & Akinlabi, E.T. 2016. Effect of scanning speed and gas flow rate on surface roughness of LMD titanium-alloy.
- Description: Abstract: This study investigated the effect of scanning speed and gas flow rate on surface finish produced during the laser metal deposition process of Ti6Al4V, an important aerospace alloy. In this work, Nd-YAG laser was employed with coaxial powder deposition nozzle attached to the end effector of a Kuka robot. The laser power was maintained at 3.0 kW and the powder flow rate at a value 2.88 g/min. The scanning speed was varied between 0.01 and 0.05 m/s and the gas flow rate was varied between 1 and 5 l/min. A total of ten samples were produced and the surface roughness was measured using the average of five measurements from each sample. The microstructure was also studied with optical microscope to relate it to the surface roughness. The results showed that, the average surface finish increased as the scanning speed was increased. Conversely, as the gas flow rate was increased the average surface roughness was reduced. In optimizing the laser metal deposition process, the processing parameters need to be optimized. The results from this study will assist in choosing the right powder flow rate and scanning speed especially in applications such as repair and surface modification.
- Full Text:
- Authors: Mahamood, Rasheedat M. , Akinlabi, Esther Titilayo
- Date: 2016
- Subjects: Additive Manufacturing , Laser Metal Deposition (LMD) , Process parameter
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/214824 , uj:21329 , Citation: Mahamood, R.M & Akinlabi, E.T. 2016. Effect of scanning speed and gas flow rate on surface roughness of LMD titanium-alloy.
- Description: Abstract: This study investigated the effect of scanning speed and gas flow rate on surface finish produced during the laser metal deposition process of Ti6Al4V, an important aerospace alloy. In this work, Nd-YAG laser was employed with coaxial powder deposition nozzle attached to the end effector of a Kuka robot. The laser power was maintained at 3.0 kW and the powder flow rate at a value 2.88 g/min. The scanning speed was varied between 0.01 and 0.05 m/s and the gas flow rate was varied between 1 and 5 l/min. A total of ten samples were produced and the surface roughness was measured using the average of five measurements from each sample. The microstructure was also studied with optical microscope to relate it to the surface roughness. The results showed that, the average surface finish increased as the scanning speed was increased. Conversely, as the gas flow rate was increased the average surface roughness was reduced. In optimizing the laser metal deposition process, the processing parameters need to be optimized. The results from this study will assist in choosing the right powder flow rate and scanning speed especially in applications such as repair and surface modification.
- Full Text:
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