Effect of powder density variation on premixed Ti-6Al-4V and Cu composites during laser metal deposition
- Authors: Erinosho, Mutiu F. , Akinlabi, Esther Titilayo , Pityana, Sisa
- Date: 2016
- Subjects: Powder density , Laser metal deposition , Titanium alloys , Copper
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/123406 , uj:20787 , Citation: Erinosho, M.F., Akinlabi, E.T & Pityana, S. 2016. Effect of powder density variation on premixed Ti-6Al-4V and Cu composites during laser metal deposition.
- Description: Abstract: This paper reports the effect of powder density variation on the premixed Ti-6Al-4V/Cu and Ti-6Al-4V/2Cu Composites. Two sets of experiment were conducted in this study. Five deposits each were made for the two premixed composites. Laser powers were varied between 600 W and 1700 W while a scanning speed of 0.3 m/min is kept constant throughout the experiment. Investigations were conducted on the microstructures and microhardness of the laser deposited premixed Ti-6Al-4V/Cu and Ti-6Al-4V/2Cu composites. It was found that the evolving microstructures of the composites were characterised with the formation of macroscopic banding and Widmanstatten; and disappears as it grows towards the fusion zone (FZ) and this could be attributed to the changes in the distribution of heat input. Sample A2 of premixed Ti-6Al-4V/Cu composite gives the highest hardness of 393 ± 6.36VHN0.5 while sample B4 of premixed Ti-6Al-4V/2Cu composites depicts the highest hardness value of 373 ± 9.18VHN0.5.
- Full Text:
Effect of rapid cooling of high temperature laser fabricated Ti/B4C/BN coating on Ti-6AL-4V alloy
- Authors: Franklin, Ochonogor O. , Akinlabi, Esther Titilayo , Nyembwe, Kasongo D. , Pityana, Sisa , Shongwe, Mxolisi Brendon
- Date: 2016
- Subjects: Heat treatment , Titanium alloys
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/214859 , uj:21334 , Citation: Franklin, O.O. et al. 2016. Effect of rapid cooling of high temperature laser fabricated Ti/B4C/BN coating on Ti-6AL-4V alloy.
- Description: Abstract: A hybrid Ti-6Al-4V based metal matrix composites characterized of martensitic structure was formed using three hoper system. Different volume percentages used were as follows: 3.0 vol. % of Ti-6Al-4V, 3.2 vol. % of Ti-6Al-4V and 3.4 vol. % of Ti-6Al-4V respectively while an equal amount of BN and B4C mixed with the Ti-6Al-4V powder particle was fed through the hoper systems at a constant laser power 2000 W and scanning speed of 1.0 m/s. The influence of rapid cooling and varied powder particle at constant coating temperature on the surface morphology and hardness property of Ti-6Al- 4V/B4C/BN alloy systems was however investigated. The hardness result of experimental showed a general improvement. Further result showed that the Ti-6Al- 4V/B4C/BN system fabricated at 3.0 Ti Vol. percent had a hardness improvement as high as 986.9 HVO.5 compared to the as receive Ti-6Al-4V substrate Hardness value of about 357.3 HVO.5. 3.2 Ti Vol. percent systems recorded a hardness value of 723.4 HVO.5 and 3.2 Ti Vol. percent system recorded a hardness value of 609.6 HVO.5. Optical microscope (OM) Scanning electron microscope (SEM) was also carried out for microstructural evaluation and Energy Dispersive Spectroscopy (EDS) to confirm the elemental composition of coating when necessary.
- Full Text:
Effect of scanning speed on laser deposited 17-4PH stainless Steel
- Authors: Bayode, Abiodun , Pityana, Sisa , Akinlabi, Esther Titilayo , Shongwe, Mxolisi Brendon
- Date: 2017
- Subjects: Functionaly graded material , Laser metal deposition , Mechanical property
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/237432 , uj:24324 , Citation: Bayode, A. et al. 2017. Effect of scanning speed on laser deposited 17-4PH stainless Steel.
- Description: Abstract: Laser metal deposition (LMD) is one of the additive manufacturing technologies that is used in the production of fully dense parts layer by layer. This innovative manufacturing process has the potential to reduce the weight, time and cost of manufacturing components. It is able to process different metallic powders and also produce custom alloy or functionally graded material by consolidating different metallic powders. The purpose of this study was to investigate and discuss the structural integrity, mechanical property and microstructure of 17-4 precipitation hardened stainless steel processed by laser metal deposition. In this study, the laser scanning speed was varied while other process parameters where kept constant. Material characterization was done using optical microscopy and Vickers indentation testing. The results show that, the processed material was structurally sound and defect free. The microstructure was predominantly martensitic and the laser scanning speed was observed to have an influence on the micro-hardness of the structure.
- Full Text:
Influence of laser power on the deposition Ti64l4V/W composite
- Authors: Ndou, Ndivhuwo , Akinlabi, Esther Titilayo , Pityana, Sisa
- Date: 2016
- Subjects: Heat affected zone , Laser metal deposition
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/214837 , uj:21331 , Citation: Ndou, N., Akinlabi, E.T & Pityana, S. 2016. Influence of laser power on the deposition Ti64l4V/W composite.
- Description: Abstract: In this study of laser power on deposited of Ti64l4V/W was investigated. The energy flow rates were varied while every single other parameter were kept at a steady. The evolving microstructure and the hardness of the composites were studied and reported in this study. The study established that the laser metal deposition process is suitable for producing acceptable bonding between a deposited zone and a substrate zone. The hardness values of the deposits varied from 377HV to 719HV. The laser power directly influences the hardness and the microstructure. Scanning electron microscopy (SEM) was utilised to characterise the microstructure of the composite layer formed on the surface of the Ti6Al4V substrate. The microstructure of all the composite layers delivered by the LMD procedure has upgraded properties in connection to that of the Ti64l4V substrate.
- Full Text:
Laser metal deposition of titanium aluminide composites : a review
- Authors: Abdulrahman, Kamardeen O. , Akinlabi, Esther Titilayo , Mahamood, Rasheedat M. , Pityana, Sisa , Tlotleng, Monnamme
- Date: 2018
- Subjects: Titanium aluminide composites , Laser metal deposition , Additive manufacturing processes
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/291200 , uj:31618 , Citation: Abdulrahman, K.O. et al. 2018. Laser metal deposition of titanium aluminide composites : a review.
- Description: Abstract: Development of additive manufacturing (AM) from three dimensional printers with ability of producing parts having no need for tooling continue to wax stronger in the manufacturing field. Laser metal deposition, a technique in AM is usually employed to create solid components from model of computer aided design (CAD). Feeding powder supported by shielding gas employed by this technique, is injected into a melt pool produced by accurately focused laser beam on a substrate. This paper discusses some of the AM technologies available, review on laser metal deposition of titanium aluminide on other metals and alloys, relationship between the processing parameters and structural and mechanical properties
- Full Text:
Microstructure of Ti6Al4V reinforced by coating W particles through laser metal deposition
- Authors: Ndou, Ndivhuwo , Akinlabi, Esther Titilayo , Pityana, Sisa , Shongwe, Mxolisi
- Date: 2016
- Subjects: Laser metal deposition
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/214816 , uj:21328 , Citation: Ndou, N. et al. 2016. Microstructure of Ti6Al4V reinforced by coating W particles through laser metal deposition.
- Description: Abstract: The study of laser power on deposited of Ti64l4V/W was investigated. The laser metal deposition technique has proven to be a process that is sustainable. The microstructure and microhardness properties of a Tungsten powder strengthened composite coating produced via the laser metal deposition process were investigated in this study. Laser metal deposition was completed utilizing laser power of 800W, 900W, 1100W, 1000Wand 1200W. Scanning electron microscopy (SEM) and microhardness machine were used to characterise the microstructure and hardness of the composite layer formed on the surface of the Ti6Al4V substrate. The microstructures of all the composite layers produced by the Laser Metal Deposition process were enhanced relative to those of the Ti64l4V substrate.
- Full Text: