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Browsing by Subject "Microhardness"

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Behaviour of laser metal deposited Ti6Al4V/ Cu composites in Hank’s solution in terms of biocompatibility properties

Author: Erinosho, MF ; Akinlabi, ET ; Pityana, Sisa L Date: 2016 Ti6Al4V alloy is a well-known material for biomedical application due to the very excellent corrosion resistance it possessed. Cu has an excellent antimicrobial property and stabilizes the immune system of the body activities. In this present ... Read more
Characterization of laser metal deposited 316L stainless steel

Author: Bayode, A ; Akinlabi, ET ; Pityana, Sisa L Date: Jun 2016 Laser metal deposition (LMD) is an innovative manufacturing technique that uses laser to melt powders to fabricate fully dense components layer by layer. It is capable of processing different metallic powders and can also be used for consolidating ... Read more
EBSD analysis of tungsten-filament carburization during the hot-wire CVD of multi-walled carbon nanotubes

Author: Oliphant, CJ ; Arendse, CJ ; Camagu, ST ; Swart, H Date: Feb 2014 Filament condition during hot-wire chemical vapor deposition conditions of multi-walled carbon nanotubes is a major concern for a stable deposition process. We report on the novel application of electron backscatter diffraction to characterize ... Read more
Effect of laser scanning speed on surface properties of Ti-Si laser clad intermetallic coatings fabricated on Ti-6Al-4V alloy

Author: Phala, MF ; Popoola, API ; Tlotleng, Monnamme ; Pityana, Sisa L Date: 2018 A binary Ti-Si (1 : 1) alloy coating was fabricated on Ti-6Al-4V alloy using laser cladding technique where Neodymium yttrium aluminium garnet laser was utilised. Micro-atomised powders of Ti and Si were used for deposition of multi-track ... Read more
The effect of Nb addition on the microstructural, mechanical and electrochemical characteristics of AlCrFeNiCu high entropy alloy

Author: Malatji, N ; Popoola, API ; Lengopeng, T ; Pityana, Sisa L Date: Oct 2020 AlCrFeNiCuNb(subx) high entropy alloys were successfully fabricated using laser metal deposition technique. Laser power of 1600W and scanning speed of 1.2 m/min were used during the processing of the alloys. The microstructural, mechanical ... Read more
Effect of powder density variation on premixed Ti-6Al-4V and Cu composites during laser metal deposition

Author: Erinosho, MF ; Akinlabi, ET ; Pityana, Sisa L Date: May 2016 This paper reports the effect of powder density variation on the premixed Ti-6Al-4V/Cu and Ti-6A-4V/2Cu Composites. Two sets of experiment were conducted in this study. Five deposits each were made for the two premixed composites. Laser powers ... Read more
Effects of laser bending on the microstructural constituents

Author: Tshabalala, Lerato C ; Pityana, Sisa L ; Mbaya, R Date: 2012 This article will illustrate the correlation between microstructural and microhardness changes in high-strength-low-alloy steel that occur as a result of laser-bending. Laser bending is a process of bending metal shapes using the laser beam ... Read more
The effects of LENS process parameters on the behaviour of 17-4 PH stainless steel

Author: Mathoho, Ipfi ; Akinlabi, ET ; Arthur, Nana KK ; Tlotleng, Monnamme ; Makoana, Nkutwane W Date: Feb 2020 17-4 PH stainless steel has proven to be one of the workhorse materials in industries such as aerospace, chemical, and energy. The attraction of this alloy to the aforementioned industries is derived from the fact that 17-4 PH stainless steel ... Read more
Fabrication of stainless steel based FGM by laser metal deposition

Author: Bayode, A ; Akinlabi, ET ; Pityana, Sisa L Date: Apr 2018 Recent advancement in materials processing has resulted in the evolution of advance composite known as Functionally Graded Materials (FGMs). FGMs are multi-layered structures with composition and/or microstructure that vary spatially across ... Read more
Fabrication of Ti10Fe5Si5Cr3Nb composite coatings on Ti-6Al-4V alloy using laser cladding technique

Author: Malatjia, N ; Popoola, API ; Pityana, Sisa L ; Lengopeng, T Date: Jun 2021 Ti10Fe5Si5Cr3Nb composite coatings were fabricated using laser cladding technique. Laser power was varied from 800W to 1200W while the scanning speed was kept constant at 1.5 m/min. The microstructural analysis of the samples was conducted ... Read more
Gas flow rate and powder flow rate effect on properties of laser metal deposited Ti6Al4V

Author: Pityana, Sisa L ; Mahamood, RM ; Akinlabi, ET ; Shukla, M Date: Mar 2013 Tracks of Ti6Al4V powder were deposited on Ti6Al4V substrate using Laser Metal Deposition (LMD) process, an Additive Manufacturing (AM) manufacturing technology, at a laser power and scanning speed maintained at 1.8 kW and 0.005 m/s respectively. ... Read more
Impact of DED process parameters on the metallurgical characteristicsof 17-4 PH SS deposited using DEDI

Author: Mathoho, I ; Akinlabi, ET ; Arthur, Nana KK ; Tlotleng, Monnamme Date: Aug 2020 This study investigated the influence direct energy deposition (DED) process parameters have on the metallurgical characteristics (porosity, microstructural evolution, microhardness, and corrosion behavior) of 17−4 PH stainless steel powder. ... Read more
Influence of ZrB2 addition on microstructural development and microhardness of Ti-SiC clad coatings on Ti6Al4V substrate

Author: Farotade, GA ; Popoola, AP ; Pityana, Sisa L Date: Aug 2017 The microstructural features and microhardness of ZrB(sub2) reinforced Ti-SiC coatings on Ti-6Al-4V substrate were studied.The deposition of these coatings was achieved via laser cladding technique. A 4.0 KW fiber delivered Nd: YAG laser was ... Read more
Laser butt welding of thin Ti6Al4V sheets: Effects of welding parameters

Author: Omoniyi, P ; Mahamood, R ; Arthur, Nana KK ; Pityana, Sisa L ; Skhosane, Besabakhe S ; Okamoto, Y ; Shinonaga, T ; Maina, M ; Jen, T-C ; Akinlabi, E Date: Sep 2021 Titanium and its alloys, particularly Ti6Al4V, which is widely utilized in the marine and aerospace industries, have played a vital role in different manufacturing industries. An efficient and cost-effective way of joining this metal is by ... Read more
Laser metal deposition of Ti6Al4V: A study on the effect of laser power on microstructure and microhardness

Author: Mahamood, RM ; Akinlabi, ET ; Shukla, M ; Pityana, Sisa L Date: Mar 2013 The effect of laser power on the resulting microstructure and microhardness of laser metal deposited Ti6Al4V powder on Ti6Al4V substrate has been investigated. The tracks were deposited using 99.6 % pure Ti6Al4V powder of particle size ranging ... Read more
Laser surface alloying of aluminium with WC+Co+NiCr for improved wear resistance

Author: Nath, S ; Pityana, Sisa L ; Majumdar, JD Date: Mar 2012 In the present study, laser surfac ealloying of aluminium with WC + Co + NiCr (in the ratio of 70:15:15) has been conducted using a 5 kW continuous wave (CW) Nd:YAG laser (at a beam diameter of 0.003 m), with the output power ranging from 3 ... Read more
Laser surface alloying of aluminium with WC+Co+NiCr for improved wear resistance

Author: Nath, S ; Pityana, Sisa L ; Majumdar, JD Date: Mar 2012 In the present study, laser surface alloying of aluminium with WC + Co + NiCr (in the ratio of 70:15:15) has been conducted using a 5 kW continuous wave (CW) Nd:YAG laser (at a beam diameter of 0.003 m), with the output power ranging from 3 ... Read more
Metallurgical characteristics of laser peened 17-4 PH SS processed by LENS technique

Author: Mathoho, Ipfi ; Akinlabi, ET ; Arthur, Nana KK ; Tlotleng, Monnamme ; Masina, Bathusile N Date: Mar 2019 This study investigated the effect of laser peening on the surface integrity (surface roughness, microstructure and microhardness) of 17-4 PH stainless steel components which were built through the direct energy deposition (DED). Additive ... Read more
Microstructural and mechanical properties of Ti-Mo alloys designed by the cluster plus glue atom model for biomedical application

Author: Moshokoa, Nthabiseng ; Raganya, Mampai L ; Obadele, BA ; Machaka, Ronald ; Makhatha, ME Date: Oct 2020 β-type titanium alloys are acquiring research interest in orthopaedic applications because of their exceptional properties such as moderate strength, good biocompatibility and corrosion resistance, high ductility and low elastic modulus. The ... Read more
Microstructural, mechanical and electrochemical properties of AlCrFeCuNiWx high entropy alloys

Author: Malatji, N ; Lengopeng, T ; Pityana, Sisa L ; Popoola, AP Date: Feb 2021 AlCrFeNiCuWx high entropy alloys were fabricated on 316 L stainless steel substrate using laser metal deposition technique. The microstructural and mechanical characteristics of these alloys were studied by advanced characterization techniques. ... Read more

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