Effect of heat treatment on wear behaviour of rolled carbon steel in DOT4 brake fluid
- Ajibola, Olawale. O., Akinribide, Ojo J., Akinwamide, Samuel O., Olubambi, Peter A.
- Authors: Ajibola, Olawale. O. , Akinribide, Ojo J. , Akinwamide, Samuel O. , Olubambi, Peter A.
- Date: 2019
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/405099 , uj:34002 , Citation: Ajibola, O.O. et al. 2019. Effect of heat treatment on wear behaviour of rolled carbon steel in DOT4 brake fluid.
- Description: Abstract: The wear of heat-treated rolled carbon steels (HTRCSs) were performed under dry and wet sliding in DOT4 brake fluid is successfully investigated and reported in the study. The HTRCSs samples were obtained by heating to and soaking the as-rolled carbon steel (ARCS) at 950 oC prior to quenching or cooling in different media at different selected temperatures between (20 and 250 oC) and atmospheric conditions. The microstructures and wear track patterns of specimens were evaluated using SEM and high-resolution metallurgical microscope. The sliding wear behaviour and wear track patterns of the specimens impressed under 10N normal loads and reciprocating mode was used to assess the wear damages. The obtained wear properties were compared in air and DOT4 fluid environments using Anton Paar TRB tribometer. The results obtained showed that enhanced wear behaviours were obtained from the oil and water quenched samples as compared with the air and furnace cooled samples. The HTRCSs samples are more tolerable than as-rolled sample (ARCS) under dry sliding. However, beside the influences of the heat treatments, the lubricating effect of DOT4 is more pronounced in the results. The CoF ranges from 0.105 to 0.137 for wet sliding while higher CoF values (0.378-0.934) were obtained in the dry sliding.
- Full Text:
- Authors: Ajibola, Olawale. O. , Akinribide, Ojo J. , Akinwamide, Samuel O. , Olubambi, Peter A.
- Date: 2019
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/405099 , uj:34002 , Citation: Ajibola, O.O. et al. 2019. Effect of heat treatment on wear behaviour of rolled carbon steel in DOT4 brake fluid.
- Description: Abstract: The wear of heat-treated rolled carbon steels (HTRCSs) were performed under dry and wet sliding in DOT4 brake fluid is successfully investigated and reported in the study. The HTRCSs samples were obtained by heating to and soaking the as-rolled carbon steel (ARCS) at 950 oC prior to quenching or cooling in different media at different selected temperatures between (20 and 250 oC) and atmospheric conditions. The microstructures and wear track patterns of specimens were evaluated using SEM and high-resolution metallurgical microscope. The sliding wear behaviour and wear track patterns of the specimens impressed under 10N normal loads and reciprocating mode was used to assess the wear damages. The obtained wear properties were compared in air and DOT4 fluid environments using Anton Paar TRB tribometer. The results obtained showed that enhanced wear behaviours were obtained from the oil and water quenched samples as compared with the air and furnace cooled samples. The HTRCSs samples are more tolerable than as-rolled sample (ARCS) under dry sliding. However, beside the influences of the heat treatments, the lubricating effect of DOT4 is more pronounced in the results. The CoF ranges from 0.105 to 0.137 for wet sliding while higher CoF values (0.378-0.934) were obtained in the dry sliding.
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Fabrication of forced air cool austempered ductile iron and exploring its corrosion behaviour in a simulated mine water
- Ige, Oladeji O., Olawale, Oluyemi J., Oluwasegun, Kunle M., Aribo, Sunday, Obadele, Babatunde A., Olubambi, Peter A.
- Authors: Ige, Oladeji O. , Olawale, Oluyemi J. , Oluwasegun, Kunle M. , Aribo, Sunday , Obadele, Babatunde A. , Olubambi, Peter A.
- Date: 2017
- Subjects: Austempering process , Forced air cool quenching , Austempered ductile iron
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/217627 , uj:21663 , Citation: Ige, O.O. et al. 2017. Fabrication of forced air cool austempered ductile iron and exploring its corrosion behaviour in a simulated mine water. International Conference on Sustainable Materials Processing and Manufacturing, SMPM 2017, 23-25 January 2017, Kruger National Park
- Description: Abstract: The production of austempered ductile iron (ADI) with uniform microstructure and properties is constrained by the austempering process vis-à-vis the quenching medium. This is as a result of the stringent operating parameters with costly facilities. This limitation has restricted the application of ADI, despite its inherent mechanical and chemical properties. An emerging technology of overcoming this limitation is by austempering with force air cooling equipment, which is accessible, available and cost-efficient. This work characterizes the behaviour of the forced air cool ADI in simulated mine water due to the strategic importance of the mining industry in the global economy. The study establishes the influence of sample section thickness on the corrosion performance. The sample’s thickness were 5, 15, and 20 mm. Electrochemical experiments were performed on the forced air cool ADI at atmospheric pressure and room temperature with method such as open circuit potential (OCP). The post-corrosion analyses were performed using X-ray diffractometry (XRD) and field emission scanning electron microscopy (FESEM). The research highlighted that small section thickness has a more favourable performance compared with larger section. Consideration is also accorded to the capability of the ADI in the studied environment.
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- Authors: Ige, Oladeji O. , Olawale, Oluyemi J. , Oluwasegun, Kunle M. , Aribo, Sunday , Obadele, Babatunde A. , Olubambi, Peter A.
- Date: 2017
- Subjects: Austempering process , Forced air cool quenching , Austempered ductile iron
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/217627 , uj:21663 , Citation: Ige, O.O. et al. 2017. Fabrication of forced air cool austempered ductile iron and exploring its corrosion behaviour in a simulated mine water. International Conference on Sustainable Materials Processing and Manufacturing, SMPM 2017, 23-25 January 2017, Kruger National Park
- Description: Abstract: The production of austempered ductile iron (ADI) with uniform microstructure and properties is constrained by the austempering process vis-à-vis the quenching medium. This is as a result of the stringent operating parameters with costly facilities. This limitation has restricted the application of ADI, despite its inherent mechanical and chemical properties. An emerging technology of overcoming this limitation is by austempering with force air cooling equipment, which is accessible, available and cost-efficient. This work characterizes the behaviour of the forced air cool ADI in simulated mine water due to the strategic importance of the mining industry in the global economy. The study establishes the influence of sample section thickness on the corrosion performance. The sample’s thickness were 5, 15, and 20 mm. Electrochemical experiments were performed on the forced air cool ADI at atmospheric pressure and room temperature with method such as open circuit potential (OCP). The post-corrosion analyses were performed using X-ray diffractometry (XRD) and field emission scanning electron microscopy (FESEM). The research highlighted that small section thickness has a more favourable performance compared with larger section. Consideration is also accorded to the capability of the ADI in the studied environment.
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Initial reaction mechanism on the atomic layer deposition of platinum on a graphene surface : a density functional theory study
- Mohlala, Lesego M., Jen, Tien-Chien, Olubambi, Peter A.
- Authors: Mohlala, Lesego M. , Jen, Tien-Chien , Olubambi, Peter A.
- Date: 2019
- Subjects: ALD , DFT , Finite temperature
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/400059 , uj:33371 , Citation: Mohlala, L.M., Jen, T.C. & Olubambi, P.A. 2019. Initial reaction mechanism on the atomic layer deposition of platinum on a graphene surface : a density functional theory study.
- Description: Abstract: The atomic layer deposition (ALD) of platinum on carbon supports has been studied extensively due to the wide potential application in microelectronics and catalysis. The initial reaction mechanism of atomic layer deposited platinum on a hydroxylated graphene surface has been investigated using density functional theory (DFT). Methylcyclopentadienyl trimethylplatinum (MeCpPtMe3) and molecular oxygen were adopted as precursors. In addition, finite temperature calculations were performed to investigate the effect of process conditions. The free energies were calculated at temperatures 200°C and 300°C with pressure of 1Pa. The results obtained from the simulations were compared and correlated with available literature.
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- Authors: Mohlala, Lesego M. , Jen, Tien-Chien , Olubambi, Peter A.
- Date: 2019
- Subjects: ALD , DFT , Finite temperature
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/400059 , uj:33371 , Citation: Mohlala, L.M., Jen, T.C. & Olubambi, P.A. 2019. Initial reaction mechanism on the atomic layer deposition of platinum on a graphene surface : a density functional theory study.
- Description: Abstract: The atomic layer deposition (ALD) of platinum on carbon supports has been studied extensively due to the wide potential application in microelectronics and catalysis. The initial reaction mechanism of atomic layer deposited platinum on a hydroxylated graphene surface has been investigated using density functional theory (DFT). Methylcyclopentadienyl trimethylplatinum (MeCpPtMe3) and molecular oxygen were adopted as precursors. In addition, finite temperature calculations were performed to investigate the effect of process conditions. The free energies were calculated at temperatures 200°C and 300°C with pressure of 1Pa. The results obtained from the simulations were compared and correlated with available literature.
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Wear behaviour of cast aluminium silicon (Al-Si) alloy in Dot 4 brake fluid
- Ajibola, Olawale O., Aribo, Sunday, Ige, Oladeji O., Akinribide, Ojo J., Akinwamide, Samuel O., Olubambi, Peter A.
- Authors: Ajibola, Olawale O. , Aribo, Sunday , Ige, Oladeji O. , Akinribide, Ojo J. , Akinwamide, Samuel O. , Olubambi, Peter A.
- Date: 2019
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/403851 , uj:33858 , Citation: Olawale O Ajibola et al 2019 IOP Conf. Ser.: Mater. Sci. Eng. 628 012012
- Description: Abstract: The frictional sliding behaviour of cast Al-Si alloy was investigated with and without DOT 4 hydraulic brake fluid lubrication/environments. Cast Al-Si specimen was produced from wrought alloy and the specimen surface was metallurgically prepared. The ascast product was characterized with aid of micro-hardness tester, the chemical composition was analysed by X-ray fluorescence (XRF), while X-ray diffraction (XRD) was used to identify phases present, microstructures and surface examinations were done on a high resolution metallurgical Optical Microscope. The properties of the polished and worn sample surfaces were examined by Scanning electron microscope (SEM) equipped with Energy dispersive Xray (EDS) facilities. A 6mm diameter alumina ball under varying normal loads (3-10 N) was rubbed against the surface of the cast Al-Si coupon specimen. The dry and wet sliding wear behaviour was assessed based on the CoF-sliding time behaviour. From the results, the average CoF values of 0.9064 for dry and 0.2038 for wet contacts were obtained. Comparatively, 1.03E-06 and 4.21E-07 minimum wear intensities; and 467290 and 132170 wear resistances were obtained for dry and wet contacts respectively. Behaviour of cast Al-Si in DOT4 were compared with its performance in DOT3 regarding the hydraulic brake system application.
- Full Text:
- Authors: Ajibola, Olawale O. , Aribo, Sunday , Ige, Oladeji O. , Akinribide, Ojo J. , Akinwamide, Samuel O. , Olubambi, Peter A.
- Date: 2019
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/403851 , uj:33858 , Citation: Olawale O Ajibola et al 2019 IOP Conf. Ser.: Mater. Sci. Eng. 628 012012
- Description: Abstract: The frictional sliding behaviour of cast Al-Si alloy was investigated with and without DOT 4 hydraulic brake fluid lubrication/environments. Cast Al-Si specimen was produced from wrought alloy and the specimen surface was metallurgically prepared. The ascast product was characterized with aid of micro-hardness tester, the chemical composition was analysed by X-ray fluorescence (XRF), while X-ray diffraction (XRD) was used to identify phases present, microstructures and surface examinations were done on a high resolution metallurgical Optical Microscope. The properties of the polished and worn sample surfaces were examined by Scanning electron microscope (SEM) equipped with Energy dispersive Xray (EDS) facilities. A 6mm diameter alumina ball under varying normal loads (3-10 N) was rubbed against the surface of the cast Al-Si coupon specimen. The dry and wet sliding wear behaviour was assessed based on the CoF-sliding time behaviour. From the results, the average CoF values of 0.9064 for dry and 0.2038 for wet contacts were obtained. Comparatively, 1.03E-06 and 4.21E-07 minimum wear intensities; and 467290 and 132170 wear resistances were obtained for dry and wet contacts respectively. Behaviour of cast Al-Si in DOT4 were compared with its performance in DOT3 regarding the hydraulic brake system application.
- Full Text:
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