Investigations were carried out to study critically the effects of heat treatment on the properties of rolled medium carbon steel. Representative samples of as-rolled medium carbon steel were subjected to heat treatment processes which are; Quenching, Lamellae Formation and Tempering in the following order (Q + Q + L + T), (Q + L + T) and (L + T). The steel was heated to the austenizing temperature of 830 °C and water quenched. The quenched steel was subjected to lamellae formation by reheating it to the ferrite-austenite dual-phase region at a temperature of 745 °C below the effective A C3 point and then rapidly quenched in water. The lamellae formed was tempered at 480 °C to provide an alloy containing strong, tough and lath martensite in a soft and ductile ferrite matrix. Mechanical tests were carried out on the samples and the results shows that the steel developed has excellent combination of tensile strength, hardness and impact strength which is very good for structural applications. The corrosion behaviour of the samples; heat treated rolled medium carbon steel and as-rolled medium carbon steel in sodium chloride medium were also investigated from where it was also confirmed that improved corrosion resistance is achievable by the treatment.
This study reviews the various techniques used in the preparation and processing of waste-wood fibre/particle reinforced polymer matrix composite with special interests on mechanical and structural applications. Polymer composite materials are being used in a wide range of structural applications such as construction, safety wears, aerospace and automotive industries owing to their lightweight, high specific stiffness and strength. A number of materials are being used ranging from lower performance of glass fibre/polyester used in small sail boats and domestic products to high performance of carbon fibre/epoxy systems used in military aircraft and spacecraft. In recent years, many studies have been dedicated to utilize organic fillers such as coconut shell, coir, wood, pineapple leaf, cow bone, palm kernel shell, rice husk. As fillers in order to replace synthetic fillers through utilization of natural fillers or reinforcement in thermoplastic and thermoset polymer composites in an attempt to minimize the cost, manage waste-wood, increase productivity and enhance mechanical properties of composites. Waste-wood as reinforcing fillers in plastics, in place of the previously used inorganic substances and synthetic fibres, offer a major benefit in terms of environmental protection. The benefits offered by waste-wood over synthetic fibres are low densities, non-abrasive, non-toxic, high stiffness and specific properties.
This work was carried out to investigate the effect of welded joints on the mechanical properties of wrought (6063) aluminium alloy. The study revealed the influence of current and voltage on the welded joint as well as the mechanical properties of the alloy. The alloy samples were welded together by metal inert gas welding process at varying values of current and voltage after which mechanical tests were performed on the welded samples. The microstructural examination of the various fusion zones obtained was carried out. Appreciable variations in the properties of the welded samples were observed due to changes in the microstructural features of the alloys. It was concluded that variation of current and voltage remarkably affect the mechanical properties of the wrought 6063 Aluminium alloy. As the voltage increases from 25 to 30 V, the ultimate tensile strengths and hardness values increases while the impact strengths decreases but the current did not show such trend.
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