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Search Results: 1 - 10 of 138824 matches for " K. K. Alaneme "
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Design of a Cantilever - Type Rotating Bending Fatigue Testing Machine  [PDF]
K. K. Alaneme
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.1011078
Abstract: This research is centered on the design of a low–cost cantilever loading rotating bending fatigue testing machine using locally sourced materials. The design principle was based on the adaptation of the technical theory of bending of elastic beams. Design drawings were produced and components/materials selections were based on functionality, durability, cost and local availability. The major parts of the machine: the machine main frame, the rotating shaft, the bearing and the bearing housing, the specimen clamping system, pulleys, speed counter, electric motor, and dead weights; were fabricated and then assembled following the design specifications. The machine performance was evaluated using test specimens which were machined in conformity with standard procedures. It was observed that the machine has the potentials of generating reliable bending stress – number of cycles data; and the cost of design (171,000 Naira) was lower in comparison to that of rotating bending machines from abroad. Also the machine has the advantages of ease of operation and maintenance, and is safe for use.
Corrosion Behavior of Alumina Reinforced Aluminium (6063) Metal Matrix Composites  [PDF]
K. K. Alaneme, M. O. Bodunrin
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.1012088
Abstract: The influence of alumina volume percent and solution heat-treatment on the corrosion behaviour of Al (6063) composites and its monolithic alloy in salt water, basic and acidic environments is investigated. Al (6063) – Al2O3 particulate composites containing 6, 9, 15, and 18 volume percent alumina were produced by adopting two step stir casting. Mass loss and corrosion rate measurements were utilized as criteria for evaluating the corrosion behaviour of the composites. It is observed that Al (6063) – Al2O3 composites exhibited excellent corrosion resistance in NaCl medium than in the NaOH and H2SO4 media. The unreinforced alloy exhibited slightly superior corrosion resistance than the composites in NaCl and NaOH media but the composites had better corrosion resistance in H2SO4 medium. Furthermore, solution heat-treatment resulted in improved corrosion resistance for both the composites and the unreinforced alloy while the effect of volume percent alumina on corrosion resistance did not follow a consistent trend.
Mechanical Behaviour of Duplex Phase Structures in a Medium Carbon Low Alloy Steel  [PDF]
K.K. Alaneme, S. Ranganathan, T. Mojisola
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2010, DOI: 10.4236/jmmce.2010.97044
Abstract: The mechanical behaviour of duplex phases produced in a medium carbon low alloy steel with potentials for use as machine body parts and vehicle panels, has been investigated. A representative composition of the steel (C: 0.3; Si: 0.28; Mn: 0.97; Cr: 0.15) was utilized to produce ferrite – martensite duplex phases of varied proportions by intercritical annealing treatment. The tensile, hardness, and rotating bending fatigue behaviour of the structures were studied; and optical and SEM microscopy utilized to characterize the microstructures and their fracture characteristics. The duplex phase structures exhibited continuous yielding behaviour; and were characterised by high strain hardenability, high tensile strength, total elongation, toughness and superior fatigue strength (endurance limit) in comparison with the normalised structure. The fatigue fracture was observed to be characterized by mixed mode of ductile (dimple) fracture and intergranular brittle cleavage for the duplex structures. Superior tensile and fatigue property combinations were better harnessed when treatment was performed at 760℃ and 780℃ in comparison to 740℃.
Design of a Diesel Fired Heat-Treatment Furnace  [PDF]
K.K. Alaneme, S.O. Olanrewaju
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2010, DOI: 10.4236/jmmce.2010.97041
Abstract: This research is centered on the design of a diesel fired heat-treatment furnace using locally sourced materials. The design philosophy is to eliminate the use of heating elements requiring electric power which is poorly supplied in the country. Design drawings were produced and mild steel was used for the fabrication of the furnace casing, while the other components needed for the design were selected based on functionality, durability, cost and local availability. The furnace was assembled by lining the inner wall of the casing with refractory blocks made from heated mixture of kaolin, clay, sawdust and water after which the inner pot and electro technical devices (temperature controller, light indicator etc) were positioned. Testing was subsequently performed to evaluate the performance of the furnace. It was observed that the furnace has a fast heating rate (61.24℃/min to attain a pre-set temperature of 900℃); and a fuel consumption rate less than 1.41litres/hr. It was also observed that the furnace has good heat retaining capacity; can be easily maintained and safe for use.
Effect of Precipitation Hardening on Hardness and Microstructure of Austenitic Manganese Steel  [PDF]
S. Aribo, K.K. Alaneme, D.O. Folorunso, F.O. Aramide
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2010, DOI: 10.4236/jmmce.2010.92014
Abstract: The effect of precipitation hardening on microstructure and hardness of Austenitic Manganese Steel has been studied. Samples of the steel were machined, autenitized at 1000℃ and held for one hour, water quenched and then aged at different temperatures and holding times. The samples were artificially aged at 600℃ and 700℃ and were held for one, two and three hours. Microstructures and hardness values of the samples were taken. It was found out that sample aged at 700℃ for 2 hours has its carbide particles finely dispersed on the austenite matrix. This led to an increase in the hardness.
Corrosion Inhibition Performance of Lignin Extract of Sun Flower (Tithonia Diversifolia) on Medium Carbon Low Alloy Steel Immersed in H2SO4 Solution
Kenneth K. ALANEME,Sunday J. OLUSEGUN
Leonardo Journal of Sciences , 2012,
Abstract: The inhibition potentials of lignin extract of sun flower was investigated by evaluating the corrosion behaviour of medium carbon low alloy steel immersed in 1M H2SO4 solution containing varied concentration of the extract. Mass loss, corrosion rate, and adsorption characterization were utilized to evaluate the corrosion inhibition and adsorption properties of the extract. The results revealed that the lignin extract is an efficient inhibitor of corrosion in mild steel immersed in 1M H2SO4. The corrosion rates were observed to decrease with increase in concentration of lignin extract but increase with temperature. The activation energies and the negative free energy of adsorption obtained from the adsorption studies indicate that the lignin extract is physically adsorbed on the surface of the steel and that the adsorption is strong, spontaneous and fit excellently with the assumptions of the Langmuir adsorption isotherm.
Corrosion Behavior of Austenitic and Duplex Stainless Steels in Lithium Bromide
Ayo Samuel AFOLABI,K. K. ALANEME,Samson Oluwaseyi BADA
Leonardo Electronic Journal of Practices and Technologies , 2009,
Abstract: The corrosion behavior of austenitic and duplex stainless steels in various concentrations of lithium, bromide solution was investigated by using the conventional weight loss measurement method. The results obtained show that corrosion of these steels occurred due to the aggressive bromide ion in the medium. Duplex stainless steel shows a greater resistance to corrosion than austenitic stainless steel in the medium. This was attributed to equal volume proportion of ferrite and austenite in the structure of duplex stainless steel coupled with higher content of chromium in its composition. Both steels produced electrochemical noise at increased concentrations of lithium bromide due to continuous film breakdown and repair caused by reduction in medium concentration by the alkaline corrosion product while surface passivity observed in duplex stainless steel is attributed to film stability on this steel.
Mechanical Properties and Corrosion Behaviour of Aluminium Hybrid Composites Reinforced with Silicon Carbide and Bamboo Leaf Ash
K.K. Alaneme,B.O. Ademilua,M.O. Bodunrin
Tribology in Industry , 2013,
Abstract: The viability of developing low cost – high performance Al matrix hybrid composites with the use of bamboo leaf ash (an agro waste ash) and silicon carbide as complementing reinforcements was investigated. Silicon carbide (SiC)particulates added with 0, 2, 3, and 4 wt% bamboo leaf ash (BLA) were utilized to prepare 10 wt% of the reinforcing phase with Al-Mg-Si alloy as matrix using two-step stir casting method. Microstructural characterization, mechanical properties evaluation and corrosion behaviour were used to assess the performance of the composites. The results show that the hardness, ultimate tensile strength, and percent elongation of the hybrid composites decrease with increase in BLA content. The fracture toughness of the hybrid composites were however superior to that of the single reinforced Al - 10 wt% SiC composite. Only the 2 wt % BLA containing hybrid composite had specific strength value comparable to that of the single reinforced composite. In 5wt% NaCl solution, it was observed that the 2 and 3 wt % BLA containing hybrid composites had higher corrosion resistance in comparison to the single reinforced Al - 10 wt% SiC composite but the reverse trend was observed in 0.3M H2SO4 solution where the single reinforced had superior corrosion resistance.
Influence of Thermomechanical Processing on the Corrosion Behaviour of Aluminium (6063)-SiCp Composites in NaCl and H2SO4 Environment
M.O. Bodunrin,K.K. Alaneme,S.J. Olusegun
Science Journal Ubon Ratchathani University , 2011,
Abstract: The influence of thermomechanical treatment on the corrosion behaviour of silicon carbide particulate reinforced aluminium (6063) composites in 3.5 wt% NaCl and 0.3M H2SO4 solution was investigated. Aluminium (6063) – SiC particulate composites having 6 and 9 volume fraction of SiC were produced using two-step stir casting process. The composites were cold rolled to 20 % and 35 % deformation before solution heat-treating at 550oC for 1hour followed by rapid cooling in water. Mass loss and corrosion rate measurements were utilized as criteria for evaluating the corrosion behaviour of the composites. It was observed that aluminium (6063) – SiCp composites exhibited superior corrosion resistance in 3.5 wt% NaCl solution when compared to 0.3M H2SO4 solution. Furthermore, the thermomechanical treatment resulted in significant improvement in the corrosion resistance of the composites in H2SO4 solution.
Corrosion Behaviour of Heat - Treated Al-6063/ SiCp Composites Immersed in 5 wt% NaCl Solution
Kenneth ALANEME
Leonardo Journal of Sciences , 2011,
Abstract: The influence of SiC volume percent and temper conditions (namely, as-cast, solutionized, and artificial age hardening at 180°C and 195°C) on the corrosion behaviour of Al (6063) composites and its monolithic alloy immersed in 5wt% NaCl solution has been investigated. Al (6063) - SiC particulate composites containing 6, 12 and 15 volume percent SiC were produced by premixing the SiC particles with borax additive and then adopting two step stir casting. Mass loss and corrosion rate measurements were utilized as criteria for evaluating the corrosion behaviour of the composites. The results show that the corrosion susceptibility of the Al (6063) - SiCp composites was higher than that of the monolithic alloy, and for most cases the corrosion rate of the composites increased with increase in volume percent of SiC. However, it was discovered that the nature of the passive films formed on the composites was sufficiently stable to reduce significantly the corrosion rate of the composites after 13days of immersion. This trend was observed to be consistent for all heat-treatment conditions utilized.
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