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Fracture toughness and tribological wear behaviour of micro alloyed pearlitic- ferritic ductile cast iron

- Omole, S.O., Oyetunji, A., Alaneme, K.K., Olubambi, P.A.

Authors: Omole, S.O. , Oyetunji, A. , Alaneme, K.K. , Olubambi, P.A.
Date: 2018
Subjects: Wear , Alloyed , Fracture
Language: English
Type: Article
Identifier: http://hdl.handle.net/10210/289571 , uj:31420 , Citation: Omole, S.O. et al. 2018. Fracture toughness and tribological wear behaviour of micro alloyed pearlitic- ferritic ductile cast iron. Vol. 40, No. 4 (2018) 584-593, DOI: 10.24874/ti.2018.40.04.07.
Description: Abstract: Fracture toughness and wear behaviour of micro alloyed ductile iron were investigated. Hardness, fracture, fracture toughness and wear tests were carried out on the ductile irons samples (D1, D2, D3, D4 and D5), containing micro alloyed nickel, molybdenum, copper and chromium in an amount of 0.2 % or less. They were characterized using optical metallurgical microscope and they contained pearlitic- ferritic matrix structure. They were subjected to wear test at room temperature based on pin-on-disk operation. Fracture surfaces and the wear track were studied using scanning electron microscope and found that the fracture surfaces majorly consist of fibrous with little cleavage fracture pattern in some samples. Wear mechanism is delamination with adhesive wear behavior. The specific wear rate was found to decrease with increasing hardness of the material and coefficient of friction of the ductile irons during test.
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Investigation of material wear formation on centrifugal fan impeller

- Mabunda, K. A., Mashinini, P. M.

Authors: Mabunda, K. A. , Mashinini, P. M.
Date: 2018
Subjects: Wear , Centrifugal Impeller Fan , CFD
Language: English
Type: Conference proceedings
Identifier: http://ujcontent.uj.ac.za8080/10210/375353 , http://hdl.handle.net/10210/278538 , uj:29892 , Citation: Mabunda, K.A. & Mashinini, P.M. 2018. Investigation of material wear formation on centrifugal fan impeller. 11th South African Conference on Computational and Applied Mechanics, 17-19 Sept 2018
Description: Abstract: This paper reports the investigation of wear formation on centrifugal fan impeller which was exposed to bagasse ash particles in the sugar process plant and to simulate what took place as particles impact on the impeller surface. Computational Fluid Dynamics has been used as a tool to simulate impaction of flow around the impeller to determine the impingement angles and velocity particles. After performing simulation using SolidWorks, angle of impingement was found to be low at the impeller inlet and gradually increase angle toward 90°, in reference to the blade root. The lowest angle found after simulation was 23°. This angle correlate with the theory mentioned for ductile material, stating that ductile material is susceptible to wear formation when the impact angle is between 15° and 45° with a peak at 25°. Computational Fluid Dynamics using SolidWorks has been verified by using a third‐party company that worked on Creo 3.0 simulation. Research has revealed that material selection based on particles impingement angle, is key as when applied to centrifugal fans and related applications.
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Microstructure and wear characterization of aluminum matrix composites reinforced with industrial waste fly ash particulates synthesized by friction stir processing

- Dinaharan, I., Nelson, R., Vijay, S. J., Akinlabi, Esther Titilayo

Authors: Dinaharan, I. , Nelson, R. , Vijay, S. J. , Akinlabi, Esther Titilayo
Date: 2016
Subjects: Aluminum matrix composites , Friction stir processing , Fly ash , Wear
Language: English
Type: Article
Identifier: http://hdl.handle.net/10210/93234 , uj:20321 , Citation: Dinaharan, I. et al. 2016. Microstructure and wear characterization of aluminum matrix composites reinforced with industrial waste fly ash particulates synthesized by friction stir processing.
Description: Abstract: Fly ash (FA) is a waste product of coal combustion in thermal power plants which is available in massive quantities all over the world causing land pollution. This paper reports the characterization of AA6061 aluminum matrix composites (AMCs) reinforced with FA particles synthesized using friction stir processing (FSP). The volume fraction of FA particles was varied from 0 to 18 in steps of 6. The prepared AMCs were characterized using optical microscopy (OM), scanning electron microscopy (SEM) and electron backscattered diagram (EBSD). The wear rate was estimated using a pin-on-disc wear apparatus. FA particles were observed to be distributed homogeneously in the AMC irrespective of the location within the stir zone. The EBSD micrographs revealed remarkable grain refinement in the AMC. The 2 incorporation of FA particles enhanced the microhardness and wear resistance of the AMC. The strengthening mechanisms of the AMC were discussed and correlated to the observed microstructures. The wear mechanisms were identified by characterizing the wear debris and worn surfaces.
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Role of zirconium diboride particles on microstructure and wear behavior of AA7075 in-situ aluminium matrix composites at elevated temperature

- Selvam, J. David Raja, Dinaharan, I., Rai, R. S., Mashinini, P. M.

Authors: Selvam, J. David Raja , Dinaharan, I. , Rai, R. S. , Mashinini, P. M.
Date: 2019
Subjects: Aluminium matrix composite , Zirconium diboride , Wear
Language: English
Type: Article
Identifier: http://hdl.handle.net/10210/398865 , uj:33224 , Citation: Selvam, J. D.R. et al. 2019. Role of zirconium diboride particles on microstructure and wear behavior of AA7075 in-situ aluminium matrix composites at elevated temperature.
Description: Abstract: The present research work examines the impact of temperature on the dry sliding wear behaviour of AA7075 aluminium strengthened zirconium diboride (ZrB2) particulate composite (0, 3, 6, 9 and 12 wt.%). AA7075/ZrB2 aluminium matrix composites (AMCs) were prepared by the in-situ reaction of K2ZrF6 and KBF4 to liquid aluminium. The in-situ handled AMCs were described utilizing FESEM, XRD and EBSD. The XRD pattern of the AMCs uncovered the presence of ZrB2 particulates in the matrix. The dry sliding wear behaviour of the AMCs was inspected utilizing a pin on disc machine at differing temperatures (40, 60, 120, 180 and 240OC). The wear resistance of AMCs expanded with the expanded substance of ZrB2 particulates at all test temperatures. The worn surface of the AMC pins was described utilizing FESEM.
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Wear and corrosion of wrought a6061 aluminium alloy in dot3 brake fluid

- Ajibola, Olawale O., Ige, Oladeji O., Olubambi, Peter A.

Authors: Ajibola, Olawale O. , Ige, Oladeji O. , Olubambi, Peter A.
Date: 2018
Subjects: Hydraulic Brake Fluid , Piston Application , Wear
Language: English
Type: Article
Identifier: http://hdl.handle.net/10210/263343 , uj:27838 , Citation: Ajibola, O.O., Ige, O.O. & Olubambi, P.A. 2018. Wear and corrosion of wrought a6061 aluminium alloy in dot3 brake fluid. International Journal of Engineering & Technology, 7 (2):512-519.
Description: Abstract: The twofold impact of wear and corrosion on wrought A6061 alloy in hydraulic DOT3 brake fluid environment was studied. The wear studies were performed on the samples using a developed wear-jig. Weight loss corrosion test method was used to determine the corrosion rate of the wrought A6061 alloy samples immersed in the brake fluid for a total of 1680 hours. From the results of wear tests carried out on the A6061 alloy sample with brake oil, the highest wear value of 5.24x10-7 mg/mm2/cycle (approx.) was obtained from 6 N (approx) force after 130 minutes. The wrought A6061 alloy material demonstrated the highest corrosion rates nearly 3.0 x10-2 mg/mm2/yr within the early 168 hours of immersion in brake fluid. The result is practically lower than the corrosion rate of cast specimen in DOT3 brake oil or some other alloys immersed in other corrosive media that were previously reported in the literature. The results show that small amount of chemical corrosion is sufficient to cause and accelerate mechanical wear of the material in usage.
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Wear and Corrosion of Wrought A6061 Aluminium Alloy in DOT3 Brake Fluid

- Ajibola, Olawale O., Ige, Oladeji O., Olubambi, Peter A.

Authors: Ajibola, Olawale O. , Ige, Oladeji O. , Olubambi, Peter A.
Date: 2018
Subjects: Hydraulic Brake Fluid , Piston Application , Wear
Language: English
Type: Article
Identifier: http://hdl.handle.net/10210/279684 , uj:30040 , Citation: Ajibola, O.O., Ige, O.O. & Olubambi, P.A. 2018. Wear and Corrosion of Wrought A6061 Aluminium Alloy in DOT3 Brake Fluid. International Journal of Engineering & Technology, 7 (2) (2018):512-519.
Description: Abstract: The twofold impact of wear and corrosion on wrought A6061 alloy in hydraulic DOT3 brake fluid environment was studied. The wear studies were performed on the samples using a developed wear-jig. Weight loss corrosion test method was used to determine the corrosion rate of the wrought A6061 alloy samples immersed in the brake fluid for a total of 1680 hours. From the results of wear tests carried out on the A6061 alloy sample with brake oil, the highest wear value of 5.24x10-7 mg/mm2/cycle (approx.) was obtained from 6 N (approx) force after 130 minutes. The wrought A6061 alloy material demonstrated the highest corrosion rates nearly 3.0 x10-2 mg/mm2/yr within the early 168 hours of immersion in brake fluid. The result is practically lower than the corrosion rate of cast specimen in DOT3 brake oil or some other alloys immersed in other corrosive media that were previously reported in the literature. The results show that small amount of chemical corrosion is sufficient to cause and accelerate mechanical wear of the material in usage.
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