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Melting Time Prediction Model for Induction Furnace Melting Using Specific Thermal Consumption from Material Charge Approach

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Journal of Minerals and Materials Characterization and Engineering 2021年第1期9卷 61-74页

作者： Onigbajumo Adetunji Seidu Saliu Ojo akinlabi oyetunji Newton Itua School of Mechanical Medical and Process Engineering Queensland University of Technology Brisbane Australia Department of Metallurgical and Materials Engineering Federal University of Technology Akure Ondo State Nigeria

A system-level evaluation was used to analyze the induction furnace operation and process system in this study. This paper presents an investigation into the relationship between the instantaneous chemical composition of a molten bath and its energy consumption in steelmaking. This was evaluated using numerical modelling to solve for the estimated melting time prediction for the induction furnace operation. This work provides an insight into the lowering of energy consumption and estimated production time in steelmaking using material charge balancing approach. Enthalpy computation was implemented to develop an energy consumption model for the molten metal using a specific charge composition approach. Computational simulation program engine (CastMELT) was also developed in Java programming language with a MySQL database server for seamless specific charge composition analysis and testing. The model performance was established using real-time production data from a cast iron-based foundry with a 1 and 2-ton induction furnace capacity and a medium carbon-based foundry with a 10- and 15-ton induction furnace capacity. Using parameter fitting techniques on the measured operational data of the induction furnaces at different periods of melting, the results from the model predictions and real-time melting showed good correlation between 81% - 95%. A further analysis that compared the relationship between the mass composition of a current molten bath and melting, time showed that energy consumption can be reduced with effective material balancing and controlled charge. Melting time was obtained as a function of the elemental charge composition of the molten bath in relation to the overall scrap material charge. This validates the approach taken by this research using material charge and thermodynamic of melting to optimize and better control melting operation in foundry and reduce traditional waste during iron and steel making.

关键词： Charge Calculation Mass and Energy Balance Melting Time Optimization Induction Furnace Numerical Model Iron and Steelmaking CastMELT

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Design of Steam Turbine for Electric Power Production Using Heat Energy from Palm Kernel Shell

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Journal of Power and Energy Engineering 2018年第11期6卷 111-125页

作者： Buliaminu Kareem Theophilus Ewetumo Michael K. Adeyeri akinlabi oyetunji O. E. Olatunji Department of Industrial and Production Engineering The Federal University of Technology Akure Nigeria Department of Physics The Federal University of Technology Akure Nigeria Department of Metallurgical and Materials Engineering The Federal University of Technology Akure Nigeria

The steam turbine is a prime mover that converts kinetic energy in steam into rotational mechanical energy through the impact or reaction of the steam against the blades. The aim of this study is to design a steam turbine for a small scale steam power plant with target of producing electricity. The turbine is driven by the heat energy from palm kernel shells as a renewable energy source obtained at a lower or no cost. The study was concentrated on design of turbine elements and its validation using computer packages. Specifically, the microturbine design was limited to design, modeling, simulation and analysis of the rotor, blades and nozzle under the palm kernel shell as fuel for the micro power plant. In blade design, stress failures, efficiency and blade angle parameters were considered. In casing volume design, the overall heat transfer and mean temperature, and different concepts were applied. The thermal distribution on stator and rotor was considered in order to determine its level of tolerance. The design software packages used for design validation were Solidworks and Comsol Multiphysics for analysis. Simulation results showed that the designed steam turbine can adequately tolerate change in stress/load, torsion/compression, temperature and speeds.

关键词： Palm Kernel Shell Steam Turbine Power Plant Design Software Renewable Energy

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An overview of biomass solid fuels:Biomass sources,processing methods,and morphological and microstructural properties

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Journal of Bioresources and Bioproducts 2023年第4期8卷 333-360页

作者： Segun E.Ibitoye Rasheedat M.Mahamood Tien-Chien Jen Chanchal Loha Esther T.akinlabi Department of Mechanical Engineering Science Faculty of Engineering and the Built EnvironmentUniversity of JohannesburgAuckland Park2006524South Africa Department of Mechanical Engineering Faculty of Engineering and TechnologyUniversity of IlorinIlorin P.M.B.1515Nigeria Energy Research and Technology Group CSIR-Central Mechanical Engineering Research InstituteWest BengalDurgapur-713209India Department of Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle NE18STUnited Kingdom

Biomass solid fuel(BSF)has emerged as a promising renewable energy source,but its morphological and microstructural properties are crucial in determining their physical,mechanical,and chemical *** paper provides an overview of recent research on *** focus is on biomass sources,BSF processing methods,and morphological and microstructural properties,with a special emphasis on energy-related *** inclusion and exclusion criteria were established for the study to ensure *** inclusion criteria encompassed studies about BSFs and studies investigating the influence of biomass sources and processing methods on the morphological and microstructural properties of solid fuels within the past five *** technologies for converting biomass into usable energy were discussed,including gasification,torrefaction,carbonization,hydrothermal carbonization(HTC),and *** has advantages and disadvantages in energy performance,techno-economics,and climate *** is efficient but requires high *** produces bio-oil,char,and gases based on feedstock *** generates low-cost biochar for solid fuels and carbon sequestration *** increases energy density for co-firing with *** processes wet biomass efficiently with lower energy *** treatment affects BSF durability and strength,often leading to less durability due to voids and gaps between *** carbonization alters surface morphology,creating cavities,pores,and distinctive *** pyrolysis generates biochar with better morphological properties,while fast pyrolysis yields biochar with lower porosity and surface *** constitutes 67%of the biomass sources utilized for bioenergy generation,followed by wood residues(5%),agro-residues(4%),municipal solid wastes(3%),energy crops(3%),livestock wastes(3%),and forest residues(1%).Each source has advantages and drawbacks,such as avail

关键词： Biomass feedstock Microstructural property Morphological property Renewable energy Thermal treatment

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Predicting the Volume Fraction of Martensite in Welded Mild Steel Joint Reinforced with Titanium Alloy Powder

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Modeling and Numerical Simulation of Material Science 2023年第2期13卷 11-27页

作者： Alain Ngenzi Stephen A. akinlabi Anthony K. Muchiri Pan African University Institute for Basic Sciences Technology and Innovation (PAUSTI) Nairobi Kenya Department of Mechanical and Construction Engineering Northumbria University Newcastle UK Department of Mechatronic Engineering Jomo Kenyatta University of Agriculture and Technology (JKUAT) Nairobi Kenya

Welded mild steel is used in different applications in engineering. To strengthen the joint, the weld can be reinforced by adding titanium alloy powder to the joint. This results in the formation of incomplete martensite in a welded joint. The incomplete martensite affects mechanical properties. Therefore, this study aims to predict the volume fraction of martensite in reinforced butt welded joints to understand complex phenomena during microstructure formation. To do so, a combination of the finite element method to predict temperature history, and the Koistinen and Marburger equation, were used to predict the volume fraction of martensite. The martensite start temperature was calculated using chemical elements obtained from the dilution-based mixture rule. The curve shape of martensite evolution was observed to be relatively linear due to the small quantity of martensite volume fraction. The simulated result correlated with experimental work documented in the literature. The model can be used in other powder addition techniques where the martensite can be observed in the final microstructure.

关键词： Finite Element Analysis Martensite Volume Fraction Dilution Koistinen and Marburger Equation

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Microstructural Characterization and Tensile Behavior of Rutile(TiO_2)-Reinforced AA6063 Aluminum Matrix Composites Prepared by Friction Stir Processing

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Acta Metallurgica Sinica(English Letters) 2019年第1期32卷 52-62页

作者： Sahayam Joyson Abraham Isaac Dinaharan Jebaraj David Raja Selvam Esther Titilayo akinlabi Department of Mechanical Engineering V V College of Engineering Department of Mechanical Engineering Science University of Johannesburg Auckland Park Kingsway Campus Department of Mechanical Engineering Karunya Institute of Technology and Sciences

Rutile(TiO_2) particle-reinforced aluminum matrix composites were prepared by friction stir processing. The microstructure was studied using conventional and advanced characterization techniques. TiO_2 particles were found to be dispersed uniformly in the composite. Clusters of TiO_2 particles were observed at a higher particle content of 18 vol%. The interface between the TiO_2 particle and the aluminum matrix was characterized by the absence of pores and reactive ***-grain boundaries, ultra-fine grains and dislocation density were observed in the composites. TiO_2 particles improved the mechanical properties of the composites. However, a drop in tensile strength was observed at a higher particle content due to cluster formation. All the prepared composites exhibited ductile mode of fracture.

关键词： Aluminum matrix composites Friction stir processing Rutile Microstructure Tensile strength

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焊接工艺参数对铝和铜异种搅拌摩擦焊接头腐蚀性能的影响(英文)

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Transactions of Nonferrous Metals Society of China 2014年第5期24卷 1323-1330页

作者： Esther T.akinlabi Anthony ANDREWS Stephen A.akinlabi Department of Mechanical Engineering Science University of JohannesburgAuckland Park Kingsway Campus Department of Materials Engineering Kwame Nkrumah University of Science and Technology School of Mechanical Industrial and Aeronautical Engineering University of Witwatersrand

报道了焊接工艺参数对铝（AA5754）和铜（C11000）异种搅拌摩擦焊接头腐蚀性能的影响.研究了在旋转速度600～1200 r/min、进料速度50～300mm/min下焊接头的显微组织和腐蚀性能.结果表明,在接头界面区域存在铝和铜的金属间化合物层;焊接... 详细信息

报道了焊接工艺参数对铝（AA5754）和铜（C11000）异种搅拌摩擦焊接头腐蚀性能的影响.研究了在旋转速度600～1200 r/min、进料速度50～300mm/min下焊接头的显微组织和腐蚀性能.结果表明,在接头界面区域存在铝和铜的金属间化合物层;焊接头的耐蚀性随着旋转速度的加快而增强;焊接头的耐蚀性比基体铜有改善,但比铝略有降低.在旋转速度950 r/min、进料速度300mm/min的条件下得到的焊接头的耐蚀性最好.

关键词：铝合金铜腐蚀搅拌摩擦焊工艺参数

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Influence of processing route on microstructure and wear resistance of fly ash reinforced AZ31 magnesium matrix composites

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Journal of Magnesium and Alloys 2019年第1期7卷 155-165页

作者： I.Dinaharan S.C.Vettivel M.Balakrishnan E.T.akinlabi Department of Mechanical Engineering Science University of JohannesburgAuckland Park Kingsway CampusJohannesburg 2006 GautengSouth Africa Department of Mechanical Engineering Chandigarh College of Engineering and TechnologyChandigarh 160019India Department of Mechanical Engineering Nehru Institute of Engineering and TechnologyCoimbatore 641105 Tamil NaduIndia

Utilizing fly ash(FA)as reinforcement for magnesium matrix composites(MMCs)brings down the production cost and the land *** alloy AZ31 was reinforced with FA particles(10 vol.%)successfully by two different processing methods namely conventional stir casting and friction stir processing(FSP).The microstructural features were observed using optical microscope,scanning electron microscope and electron backscatter *** sliding wear behavior was tested using a pin-on-disc wear *** stir cast composite showed inhomogeneous particle dispersion and coarse grain *** of the FA particles decomposed and reacted with the matrix alloy to produce undesirable ***,FSP composite showed superior particle dispersion and fine,equiaxed grains by dynamic *** particles encountered disintegration but there was no interfacial *** composite demonstrated higher strengthening and wear resistance to that of stir cast *** morphology of the worn surface and the wear debris were studied in detail.

关键词： Magnesium matrix composite Stir casting Friction stir processing Fly ash Wear

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AA1060铝合金和C1100工业纯铜搅拌摩擦点焊的演变性能（英文）

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Transactions of Nonferrous Metals Society of China 2016年第7期26卷 1852-1862页

作者： Mukuna P.MUBIAYI Esther T.akinlabi Department of Mechanical Engineering Science Auckland Park Kingsway CampusUniversity of Johannesburg

采用搅拌摩擦点焊技术连接纯铜(C11000)和纯铝(AA1060)板材,并表征了焊缝的演变性能。在不同转速和送入深度下,采用不同形状刀具制备点焊焊缝。在焊缝两边可观察到不同长度铜环,这表明铜向前挤压进入铝板,有助于得到高强焊缝。采用能量... 详细信息

采用搅拌摩擦点焊技术连接纯铜(C11000)和纯铝(AA1060)板材,并表征了焊缝的演变性能。在不同转速和送入深度下,采用不同形状刀具制备点焊焊缝。在焊缝两边可观察到不同长度铜环,这表明铜向前挤压进入铝板,有助于得到高强焊缝。采用能量散射谱和X射线衍射研究手段可观察到在铝基体中存在铜粒子,且有各种不同的金属间化合物存在。除了在转速800 r/min下采用锥形销和凹形肩得到的焊缝外,最大的拉伸断裂载荷随着送入深度的增加而增大。在剪切-拉伸载荷条件下,所有的搅拌摩擦点焊接头产生了点焊熔核滑脱失效模式。在样品锁眼附近得到了峰值硬度,这同焊接搅拌区存在金属间化合物有关。

关键词：铝铜搅拌摩擦点焊显微硬度显微组织

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工艺参数对激光金属沉积铜钛合金复合材料的影响（英文）

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Transactions of Nonferrous Metals Society of China 2015年第8期25卷 2608-2616页

作者： Mutiu F.ERINOSHO Esther T.akinlabi Sisa PITYANA Department of Mechanical Engineering Science University of Johannesburg Auckland Park Kingsway Campus National Laser Centre Council for Scientific and Industrial Research (CSIR)

为获得最佳设计方案,设计两种实验方案,通过改变工艺参数对铜钛合金复合材料进行激光金属沉积。从显微组织演变、硬度和力学性能三方面对所沉积的复合材料进行表征。结果表明:复合材料的显微组织由一次、二次和三次枝晶臂,针状组织和α... 详细信息

为获得最佳设计方案,设计两种实验方案,通过改变工艺参数对铜钛合金复合材料进行激光金属沉积。从显微组织演变、硬度和力学性能三方面对所沉积的复合材料进行表征。结果表明:复合材料的显微组织由一次、二次和三次枝晶臂,针状组织和α+β共晶组织组成。两种实验方案结果表明,在激光功率为1200 W,扫描速率为1.2 m/min的条件下得到的样品E具有最高的硬度,其值为HV(190±42),但由于其脆性,因此出现一些横间裂纹;而在激光功率为1200 W、扫描速率为0.3 m/min条件下得到的样品B无裂纹产生,且其显微组织良好并含有较多的枝晶。得到的铜复合材料的应变硬化系数为3.35。

关键词：铜复合材料激光金属沉积力学性能应变硬化

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