Hakeem Amuda

Hakeem Amuda
University of Lagos | Unilag · Department of Metallurgical & Materials Engineering

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43
Publications
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395
Citations

Publications

Publications (43)
Poster
Full-text available
Statement of Problem: Traditional groundwater quality monitoring methods often involve collecting samples on-site and sending them to a laboratory for analysis, which can be time-consuming, expensive, and impractical in remote or hard-to-access areas. Therefore, there is a need to develop a real-time system for remote quality assessment of groundw...
Article
Full-text available
In the present study, API 5L X60 / 2205 DSS dissimilar weld joints were fabricated using gas tungsten arc welding (GTAW) with ERNiCrMo-3 as the filler-metal. The influence of welding heat input (low (0.73 - 0.88 kJ/mm), medium (1.3 - 1.7 kJ/mm), high (2.1 - 2.8 kJ/mm) on the resistance of the welded joints to corrosion was investigated. Pitting cor...
Article
An innovative yet simple technique for the inoculation of the weld pool of commercial AISI 430 Ferritic Stainless Steel (FSS) with metal powders for grain refinement is discussed. Aluminum or titanium powder in varying amounts introduced into the weld pool via a powder preplacement technique was melted under a tungsten inert gas (TIG) torch. This s...
Article
Full-text available
The structural properties of conventional bond coat were modified to improve adhesion for thermal barrier coating. Silicon-carbide blended with aluminum, nickel and chromium powders in an aluminide bond coat was deposited on various metallic substrates via oxyacetylene flame spray in a neutral flame. Wear investigation and microstructural analysis...
Article
In this study, microhardness variation as well as macro and micro structural examination of the heat affected zone (HAZ) of a girth welded API 5L X46 pipeline material were conducted as a means of tracking local brittle zone (LBZ) in the HAZ region. The weldment analysed were built from heat input range of 695 J/mm-2567 J/mm. Analysis of the result...
Article
Full-text available
The tensile properties of dual phase steel (DPS) duplex structured quenched in hot bitumen was investigated and reported
Article
An innovative yet simple technique for the inoculation of the weld pool of commercial AISI 430 Ferritic Stainless Steel (FSS) with metal powders for grain refinement is discussed. Aluminum or titanium powder in varying amounts introduced into the weld pool via a powder preplacement technique was melted under a tungsten inert gas (TIG) torch. This s...
Article
In the present work, 16% chromium AISI 430 ferritic stainless steel weld produced under different conditions of energy input and metal powder addition using TIG torch melting is investigated for carbide precipitation. A Box Behnken experimental design paradigm is invoked with current, speed and metal powder concentration as the primary variables wh...
Article
Microstructure evolution in relation to the geometrical properties of Ti6Al4V treated with laser deposited premix Ti/TiB2 powders is presented. The microstructural characterisation is reinforced with X-ray diffractometry and scanning electron microscopy to identify the predominant phases responsible for the change inmicrohardness values of the clad...
Article
The mechanical properties of Dual Phase Steel (DPS)-duplex structure-produced by quenching in pre-heated bitumen have been investigated. Medium carbon steels intercritically heated at different temperatures and holding times were quenched in hot bitumen. Optical and scanning electron microscopy characterisation of the duplex structure showed extens...
Article
Full-text available
Chromium-manganese austenitic stainless steel is a low cost grade with metallurgical and mechanical properties approximating a standard nickel-chromium austenitic stainless steel. It serves as a good substitute to the standard nickel-chromium grade owing to the high cost of nickel. But, there is little information on its weldability particularly th...
Article
Full-text available
This paper investigated the effect of heat treatment operations on the fatigue resistance of low carbon steel. Specimens after preparation for fatigue testing were subjected to annealing, normalizing and quenching heat treatment. Results show that the annealed specimen had the largest number of cycles to failure, indicating a high fatigue resistanc...
Article
Full-text available
Carbide precipitates in Thin Wall Ductile Iron (TWDI) used for automotive applications needs to be eliminated or reduced for improved strength, ductility, crack propagation resistance and good machinability. Ductile iron thin section profiles (≤3 mm) present danger of massive carbide precipitations in the as-cast sample. Precipitated carbide phase...
Article
Enhanced cooling via forced convection using cryogenic liquid is an option for controlling grain growth in the heat affected zone (HAZ) of ferritic stainless steel welds which improves joint strength. However, this technique seems to alter the martensite distribution in the high-temperature heat affected zone (HTHAZ) which is a critical constituent...
Article
Full-text available
Enhanced cooling via forced convection using cryogenic liquid is an option for controlling grain growth in the heat affected zone (HAZ) of ferritic stainless steel welds which improves joint strength. However, this technique seems to alter the martensite distribution in the high-temperature heat affected zone (HTHAZ) which is a critical constituent...
Article
Full-text available
This paper investigated the effect of heat treatment operations on the fatigue resistance of low carbon steel. Specimens after preparation for fatigue testing were subjected to annealing, normalizing and quenching heat treatment. Results show that the annealed specimen had the largest number of cycles to failure, indicating a high fatigue resistanc...
Conference Paper
Full-text available
The conditions influencing the phenomenon of heat affected zone (HAZ) cracking during tungsten inert gas (TIG) welding of a gamma-prime (γ’) precipitation strengthened nickel-base superalloy, IN 738, is discussed here. The discussion is reinforced with the dependence of the cracking on particle size variation of the γ’ precipitates and base alloy h...
Chapter
This paper investigated the effect of heat treatment operations on the fatigue resistance of low carbon steel. Specimens after preparation for fatigue testing were subjected to annealing, normalizing and quenching heat treatment. Results show that the annealed specimen had the largest number of cycles to failure, indicating a high fatigue resistanc...
Article
The energy input and heat dissipation dynamics during fusion welding generates coarse grain in the welds resulting in poor mechanical properties. While grain refinement in welds via the control of the energy input is quite common, the influence of heat dissipation on grain morphology and properties is not fully established. This paper characterized...
Article
The paper discusses sensitization characteristics in medium chromium Ferritic Stainless Steel (FSS) welds processed at two different grain refining conditions namely metal powder addition and cryogenic cooling. Tungsten Inert Gas (TIG) torch welded samples were exposed to 10% oxalic acid electrolytic etch for evaluation of sensitization. Empirical...
Article
Two strategies for grain refinement in the Ferritic Stainless Steel (FSS) welds involving cryogenic cooling and elemental metal powder addition into the melt pool are investigated and their performances are evaluated. Full-penetration-bead single pass weld tracks were produced on AISI 430 FSS plate using a Gas Tungsten Arc (GTA). The two grain refi...
Article
Grain refinement in medium chromium ferritic stainless steel weld was attempted via elemental (aluminum) powder pre-placement technique prior to melting under a TIG torch. A Box-Behnken experimental design was adopted with current, travel speed and the amount of aluminum powder added as the process factors for producing weld pool. The resolidified...
Article
Other than grain coarsening, the loss of corrosion resistance in ferritic stainless steel (FSS) welds due to intergranular precipitation of chromium carbides restricts the use of the alloy for structural application. The use of cryogenic cooling offers dual opportunities for the control of weld geometry and grain structure in FSS. This results in i...
Article
In this work, the preliminary result on the effect of cryogenic cooling on grain growth in weld is reported. Ferritic stainless steel weld produced under TIG torch in argon environment is cooled in liquid nitrogen. The weld structure is characterized using LOM, SEM and EDX spectroscopy. The results suggest that cryogenic cooling reduced the weld wi...
Article
The effect of casting temperature, cooling rate in silica bound molding sand and modifier additions on tensile, ductility and hardness properties Al-Cu binary alloy is presented. The study revealed that casting at high cooling rate and low casting temperatures with sufficient addition of ferro-silicon not exceeding the limited concentration for sol...
Article
Studies on the weldability of ferritic stainless steel grades suggests that low heat input rate and better heat transfer dynamics are appropriate for the control of grain size and microstructural feature in thin sections. However, the optimal welding conditions to achieve combination of such characteristics are yet to be established. In the present...
Article
Full-text available
Besides the problem of low ductility and poor notch toughness of ferritic stainless steel welds due to the microstructure characteristics of the weld section as a result of the weld heat input rate and the heat transfer factor, susceptibility to intergranular corrosion caused by the depletion of the chromium content of the weld matrix particularly...
Article
The effect of some process parameters on the weight of zinc deposited on mild steel in a typical electroplating process is reported. The study indicates that the weight of zinc deposited on mild steel during the process is affected by plating temperature, current density, plating bath pH and plating time. The study established that optimum depositi...
Article
The ferritic stainless steel is a low cost alternative to the most often adopted austenitic stainless steel due to its higher strength, better ductility and superior corrosion resistance in caustic and chloride environments. However, the application of ferritic steel is limited because of poor ductility and notch impact toughness of its weld sectio...
Article
This paper investigates the microstructural induced hardness variation in multirun welded plain carbon steel at different interpass time. Beveled 16mm thick mild steel samples were welded in 2 and 4 passes at interpass time of 90, 120 and 240s respectively via manual metal arc. The result showed that the differences in hardness values of the fusion...
Article
The after-weld properties of material are influenced by the microstructural features of the weld section which are controlled by the energy input and heat transfer factors. The welding current, travel speed and the material property govern these parameters. However, the specific influence of range of heat input rates on the microstructural features...
Article
Full-text available
The improvement in the inhibitive strength of sodium sulphite on corrosion of mild steel in hydrogen cyanide by adding sodium benzoate in regulated volume was investigated using the fundamental weight loss measurement.500 ppm concentration inhibitive mixtures of sodium benzoate and sodium sulphite in three different volume ratios (5/15, 10/10, 15/5...
Article
Full-text available
The finding of studies into the factors that affects optimal performance of galvanizing kettle is presented in this paper. The production schedule and history of a failed galvanizing kettle for 3-consecutively years in a hot-dip galvanizing industry was collated and analyzed. The analysis of the collated data revealed that average galvanizing tempe...
Article
Full-text available
A simple linear equation was developed and applied to a hypothetical binary equilibrium diagram to evaluate the eutectic composition of the binary alloy system. Solution of the equations revealed that the eutectic composition of the case study Pb – Sn, Bi – Cd and Al – Si alloys are 39.89% Pb, 60.11% Sn, 58.01% Bi, 41.99% Cd and 90.94% Al, 9.06% Si...
Article
Full-text available
Cutting fluids of various types are usually employed to control the heat generated in machining. The continued application of conventional petroleum based metal working fluids is being challenged by the need to reduce overall volume of fluids, minimize health risks and bio-contamination. Bio-oils assisted machining is an environmental bio-compatibl...
Article
Full-text available
Nigeria is richly endowed in convertible natural resources of which solid minerals are a member of the endowments. However, the country is basically a mono-product economy based on its vast oil deposit accounting for over 84% of foreign earnings and 25% of GDP. The triple challenges of the volatile nature of global oil politics, achieving the objec...
Article
The level of hardness induced in heat-treatable carbon steel in a typical quenching process is dependent on operating parameters such as austenitizing temperature, quenching media, soaking time, size and shape of material, as well as condition of surface. The hardness value affects the inelastic response of material to impact loading. The paper stu...
Article
Full-text available
The analysis of the relative contribution of Zinc Oxide/Triethylene Amine mixes in controlling corrosion of mild steel in hydrogen cyanide environment is undertaken in this study.In earlier works [1,2], the individual effects of some organic and inorganic inhibitors were studied using 20ml of three different concentrations (0.5M, 1.0M and 1.5M) of...
Article
Synergistic inhibitive strength of mixtures of sodium benzoate and sodium sulphite on the corrosion behaviour of mild steel in hydrogen cyanide environment was investigated using the fundamental weight loss measurement. 1M concentration inhibitive mixtures of sodium benzoate and sodium sulphite in three different volume ratios (5/15, 10/10, 15/5) w...

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